Corresponding Author

Xing-bin YAN(xbyan@licp.cas.cn)


The biggest advantage of supercapacitor lies in not only the excellent pulse and fast charging-discharging performance, but also the characteristics of long cycle life and wide operating temperature window with no pollution. However, the energy density of supercapacitor is low. In this paper, the working principle, the development status, defects and improvement method of supercapacitors are introduced. Based on the research workes of the supercapacitors with high energy density in our group, combined with the literature reports in recent years, the strategies to promote the energy density of supercarpacitors will be focused. The strategies for the enhancement of energy density include: 1) to increase the specific capacitance of the electrode by reducing the existing materials to nano sizes or to develop new materials with high capacity; 2) to increase the voltage window of the supercapacitor by developing ionic liquid electrolyte with high voltage window or to adopt asymmetric supercapacitors in which one electrode is pseudocapacitive, while the other utilizes double layer capacitance; 3) to build lithium ion hybrid supercapacitors with both high energy density and high power density by “internal cross” the supercapacitor and lithium ion battery. Finally, the prospects in the future development of supercapacitors will be provided.

Graphical Abstract


supercapacitor, asymmetric supercapacitor, lithium-ion hybrid supercapacitor, energy density, power density

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[1] Simon P, Gogotsi Y. Materials for electrochemical capacitors [J]. Nature Materials, 2008, 7(11): 845-854.

[2] Xu B, Yue S F, Sui Z Y, et al. What is the choice for supercapacitors: graphene or graphene oxide? [J]. Energy & Environmental Science, 2011, 4(8): 2826-2830.

[3] Conway B E. Electrochemical Supercapacitors: Scientific fundamentals and technological applications [B]. Plenum Publishers, New York, 1999.

[4] Conway B E. Transition from supercapacitor to battery behavior in electrochemical energy storage [J]. Journal of The Electrochemical Society, 1991, 138(6): 1539-1548.

[5] Camara O R, Trasatti S. Surface electrochemical properties of Ti/(RuO2 + ZrO2) electrodes [J]. Electrochimica Acta, 1996, 41(3): 419-422.

[6] Yan J, Wang Q, Wei T, et al. Recent advances in design and fabrication of electrochemical supercapacitors with high energy densities [J]. Advanced Energy Materials, 2014, 4(4): 1300816.

[7] Wang D W, Li F, Wu Z S, et al. Electrochemical interfacial capacitance in multilayer grapheme sheets: dependence on number of stacking layers [J]. Electrochemistry Communications, 2009, 11(9): 1729-1732.

[8] Liu Y X, Li J, Lai Y Q, et al. Preparation and properties of pith carbon supercapacitor [J]. Journal of Central South University of Technology, 2007, 14(5): 601-606.

[9] Yan J, Fan Z J, Wei T, et al. Carbon nanotube/MnO2 composites synthesized by microwave-assisted method for supercapacitors with high power and energy densities [J]. Journal of Power Sources, 2009, 194(2): 1202-1207.

[10] Simon P, Gogotsi Y, Dunn B. Where do batteries end and supercapacitors begin?. Science, 2014, 43: 1210-1211.

[11] Fan Z J, Yan J, Wei T, et al. Asymmetric supercapacitors based on graphene/MnO2 and activated carbon nanofiber electrodes with high power and energy density [J]. Advanced Functional Materials, 2011, 21(12): 2366-2375.

[12] Wang R T, Yan X B. Superior asymmetric supercapacitor based on Ni-Co oxide nanosheets and carbon nanorods [J]. Scientific Reports, 2014, 4: 3712.

[13] Shang P, Zhang J N, Tang W T, et al. 2D thin nanoflakes assembled on mesoporous carbon nanorods for enhancing electrocatalysis and for improving asymmetric supercapacitor [J]. Advanced Functional Materials, 2016, 26(43): 7766-7774.

[14] Chen Y, Zhang X, Zhang D C, et al. High performance supercapacitors based on reduced graphene oxide in aqueous and ionic liquid electrolytes [J]. Carbon, 2011, 49(2):573-580.

[15] Liu C G, Yu Z N, Neff D, et al. Graphene-based supercapacitor with an ultrahigh energy density [J]. Nano Letters, 2010, 10(12): 4863-4868.

[16] Sudhan N, Subramani K, Karnan M, et al. Biomass-derived activated porous carbon from rice straw for a high-energy symmetric supercapacitor in aqueous and nonaqueous electrolytes [J]. Energy & Fuels, 2017, 31(1): 977-985.

[17] Yuan C Z, Hou L R, Li D K, et al. Unusual electrochemical behavior of Ru-Cr binary oxide-based aqueous symmetric supercapacitors in KOH solution [J]. Electrochimica Acta, 2013, 654-658.

[18] Zhang X, Peng C, Wang R T, et al. High-performance supercapacitors based on novel carbons derived from Sterculia lychnophora [J]. RSC Advances, 2015, 5(41): 32159-32167.

[19] Chen J S, Guan C, Gui Y, et al. Rational Design of Self-Supported Ni3S2 Nanosheets Array for Advanced Asymmetric Supercapacitor with a Superior Energy Density [J]. ACS Applied Materials & Interfaces, 2017, 9(1): 496-504.

[20] Cai Y J, Luo Y, Xiao Y, et al. Facile synthesis of three-dimensional heteroatom-doped and hierarchical egg-box-like carbons derived from moringa oleifera branches for high-performance supercapacitors [J]. ACS Applied Materials & Interfaces, 2016, 8(48): 33060-33071.

[21] Hsu Y K, Chen Y C, Lin Y G, et al. High-cell-voltage supercapacitor of carbon nanotube/carbon cloth operating in neutral aqueous solution [J]. Journal of Materials Chemistry, 2012, 22(8): 3383-3387.

[22] Fic K, Lota G, Meller M, et al. Novel insight into neutral medium as electrolyte for high-voltage supercapacitors [J]. Energy & Environmental Science, 2012, 5(2): 5842-5850。

[23] Jabeen N, Hussain A, Xia Q Y, et al. Aqueous asymmetric supercapacitors based on in situ formed Na0.5MnO2 nanosheet assembled nanowall arrays [J]. Advanced Materials, 2017, 1700804, DOI: 10.1002/ADMA.201700804.

[24] Lang J W, Yan X B, Liu W W, et al. Influence of nitric acid modification of ordered mesoporous carbon materials on their capacitive performances in different aqueous electrolytes [J]. Journal of Power Sources, 2012, 204: 220-229.

[25] Sun X Z, Zhang X, Zhang H T, et al. A comparative study of activated carbon-based symmetric supercapacitors in Li2SO4 and KOH aqueous electrolytes [J]. Journal of Solid State Electrochemistry, 2012, 16(8): 2597-2603.

[26] Bai S Y, Tan G Q, Li X Q, et al. Pumpkin-derived porous carbon for supercapacitors with high performance [J]. Chemistry-An Asian Journal, 2016, 11(12): 1828-1836.

[27] Chen C, Yu D F, Zhao G Y, et al. Three-dimensional scaffolding framework of porous carbon nanosheets derived from plant wastes for high-performance supercapaciotrs [J]. Nano Energy, 2016, 27: 377-389.

[28] Zhang C Y, Zhu X H, Cao M, et al. Hierarchical porous carbon materials derived from sheep manure for high-capacity supercapacitors [J]. ChemSusChem, 2016, 9(9): 932-937.

[29] Wei X J, Li Y B, Gao S Y. Biomass-derived interconnected carbon nanoring electrochemical capacitors with high performance in both strongly acidic and alkaline electrolytes [J]. Journal of Materials Chemistry A, 2017, 5(1): 181-188.

[30] Wang R T, Wang P Y, Yan X B, et al. Promising porous carbon derived from celtuce leaves with outstanding supercapacitance and CO2 capture performance [J]. ACS Applied Materials & Interfaces, 2012, 4(11): 5800-5806.

[31] Peng C, Yan X B, Wang R T, et al. Promising activated carbons derived from waste tea-leaves and their application in high performance supercapacitors electrodes [J]. Electrochimica Acta, 2013, 87: 401-408.

[32] Ou Y J, Peng C, Lang J W, et al. Hierarchical porous activated carbon produced from spinach leaves as an electrode material for an electric double layer capacitor [J]. New Carbon Materials, 2014, 29(3): 209-215.

[33] Zhang X, Peng C, Wang R T, et al. High-performance supercapacitors based on novel carbons derived from Sterculia lychnophora [J]. RSC Advances, 2015, 5(41): 32159-32167.

[34] Peng C, Lang J W, Xu S, et al. Oxygen-enriched activated carbons from pomelo peel in high energy density supercapacitors [J]. RSC Advances, 2014, 4(97): 54662-54667.

[35] Geng Z R, Wang H, Wang R T, et al. Facile synthesis of hierarchical porous carbon for supercapacitor with enhanced electrochemical performance [J]. Materials Letters, 2016, 182: 1-5.

[36] Wang R T, Lang J W, Yan X B. Effect of surface area and heteroatom of porous carbon materials on electrochemical capacitance in aqueous and organic electrolytes [J]. Science China Chemistry, 2014, 57(11): 1570-1578.

[37] Zhang Y, Liu S S, Zheng X Y, et al. Biomass organs control the porosity of their pyrolyzed carbon [J]. Advanced Functional Materials, 2017, 27(3): 1604687.

[38] Jeon J W, Sharma R, Meduri P, et al. In situ one-dtep dynthesis of hierarchical nitrogen-doped porous carbon for high-performance supercapacitors [J]. ACS Applied Materials & Interfaces, 2014, 6(10): 7214-7222.

[39] Atchudan R, Edison T N J I, Perumal S, et al. Green synthesis of nitrogen-doped graphitic carbon sheets with use of Prunus persica for supercapacitor applications [J]. Applied Surface Science, 2017, 393: 276-286.

[40] Yang X W, He Y S, Jiang G P, et al. High voltage supercapacitors using hydrated grapheme film in a neutral aqueous electrolyte [J]. Electrochemistry Communications, 2011, 13(11): 1166-1169.

[41] Duan B, Gao X, Yao X, et al. Unique elastic N-doped carbon naofibrous microspheres with hierarchical porosity derived from renewable chitin for high rate supercapacitors [J]. Nano Energy, 2016, 27: 482-491.

[42] Lin T Q, Chen I W, Liu F X, et al. Nitrogen-doped mesoporous carbon of extraordinary capacitance for electrochemical energy storage [J]. Science, 2015, 350(6267): 1508-1513.

[43] Zhi J, Deng S, Wang Y F, et al. Highly ordered metal oxide nanorods inside mesoporous silica supported carbon nanomembrances: high performance electrode materials for symmetrical supercapacitor devices [J]. The Journal of Physical Chemistry C, 2015, 119(16): 8530-8536.

[44] Zhi J, Reiser O, Huang F. Hierarchical MnO2 Spheres Decorated by Carbon-coated cobalt nanobeads: low-cost and high-performance electrode materials for supercapacitors [J]. ACS Applied Materials & Interfaces, 2016, 8(13): 8452-8459.

[45] Keskinen J, Tuurala S, Sjödin M, et al. Asymmetric and symmetric supercapacitors based on polypyrrole and activated carbon electrodes [J]. Synthetic Metals, 2015, 203: 192-199.

[46] Lukatskaya M R, Mashtalir O, Ren C E, et al. Cation intercalation and high volumetric capacitance of two-dimensional titanium carbide [J]. Science, 2013, 341(6153): 1502-1505.

[47] Rakhi R B, Ahmed B, Anjum D, et al. Direct chemical sythesis of MnO2 nanowhisker on transition metal carbide surfaces for supercapacitor applications [J]. ACS Applied Materials & Interfaces, 2016, 8(29): 18806-18814.

[48] Lang J W, Kong L B, Liu M, et al. Asymmetric supercapacitors based on stabilized α-Ni(OH)2 and activated carbon [J]. Journal of Solid State Electrochemistry, 2010, 14(8): 1533-1539.

[49] Jin W H, Gao G T, Sun J Y. Hybrid supercapacitor based on MnO2 and columned FeOOH using Li2SO4 electrolyte solution [J]. Journal of Power Sources, 2008, 175(1): 686-691.

[50] Lin Y P, Wu N L. Characterization of MnFe2O4/LiMn2O4 aqueous asymmetric supercapacitor [J]. Journal of Power Sources, 2011, 196(2): 851-854.

[51] Meng G, Yang Q, Wu X C, et al. Hierarchical mesoporous NiO nanoarrays with ultrahigh capacitance for aqueous hybrid supercapacitor [J]. Nano Energy, 2016, 30: 831-839.

[52] Che H W, Liu A F, Mu J B, et al. Facile synthesis of flower-like NixCo3-xO4 (0≤x≤1.5) microstructures as high-performance electrode materials for supercapacitors [J]. Electrochimica Acta, 2017, 225: 283-291.

[53] Sun S M, Wang S, Li S D, et al. Asymmetric supercapacitors based on a NiCo2O4/three dimensional grapheme composite and three dimensional graphene with high energy density [J]. Journal of Materials Chemistry A, 2016, 4(47): 18646-18653.

[54] Yue S H, Tong H, Lu L, et al. Hierarchical NiCo2O4 nanosheets/nitrogen doped graphene/carbon nanotube film with ultrahigh capacitance and long cycle stability as a flexible binder-free electrode for supercapacitors [J]. Journal of Materials Chemistry A, 2017, 5(2): 689-698.

[55] Xiong Q Q, Zheng C, Chi H Z, et al. Reconstruction of TiO2/MnO2-C nanotube/nanoflake core/shell arrays as high-performance supercapacitor electrodes [J]. Nanotechnology, 2017, 28(5): 055405(9pp).

[56] Zhang Z Q, Zhang H D, Zhang X Y, et al. Facile synthesis of hierarchical CoMoO4@NiMoO4 core-shell nanosheet arrays on nickel foam as an advanced electrode for asymmetric supercapacitors [J]. Journal of Materials Chemistry A, 2016, 4(47): 18578-18584.

[57] Zhang J, Zhang G F, Luo W H, et al. Graphitic carbon coated CuO hollow nanospheres with penetrated mesochannels for high-performance asymmetric supercapacitors [J]. ACS Sustainable Chemistry & Engineering, 2017, 5(1): 105-111.

[58] Liu L, Lang J W, Zhang P, et al. Facile synthesis of Fe2O3 nano-dots@nitrogen-doped graphene for supercpacitor electrode with ultralong cycle Life in KOH Electrolyte [J]. ACS Applied Materials & Interfaces, 2016, 8(14): 9335-9344.

[59] Su Y, Zhitomirsky I. Asymmetric electrochemical supercapacitor, based on polypyrrole coated carbon nanotube electrodes [J]. Applied Energy, 2015, 153: 48-55.

[60] Chen J S, Guan C, Gui Y, et al. Rational design of self-supported Ni3S2 nanosheets array for advanced asymmetric supercapacitor with a superior energy density [J]. ACS Applied Materials & Interfaces, 2017, 9(1): 496-504.

[61] Liu Y H, Wang R T, Yan X B. Synergistic effect between ultra-small nickel hydroxide nanoparticles and reduced graphene oxide sheets for the application in high-performance asymmetric supercapacitor [J]. Scientific Reports, 2015, 5: 11095.

[62] Guo B S, Yang Y Y, Hu Z G, et al. Redox-active organic molecules functionalized nitrogen-doped porous carbon derived from metal-organic framework as electrode materials for supercapacitor [J]. Electrochimica Acta, 2017, 223: 74-84.

[63] Wang J Y, Dou W, Zhang X T, et al. Embedded Ag quantum dots into interconnected Co3O4 nanosheets grown on 3D graphene networks for high stable and flexible supercapacitor [J]. Electrochimica Acta, 2017, 224: 260-268.

[64] Zhai T, Wan L M, Sun S, et al. Phosphate ion functionalized Co3O4 ultrathin nanosheets with greatly improved surface reactivity for high performance pseudocapacitors [J]. Advanced Materials, 2016, 29(7): 1604167(1-8).

[65] Nagamuthu S, Vijayakumar S, Lee S H, et al. Hybrid supercapaciotr devices based on MnCo2O4 as the positive electrode and FeMn2O4 as the negative electrode [J]. Applied Surface Science, 2016, 390: 202-208.

[66] Li T, Zhang W L, Zhi L, et al. High-energy asymmetric electrochemical capacitors based on oxides functionalized hollow carbon fibers electrodes [J]. Nano Energy, 2016, 30: 9-17.

[67] Wang R T, Yan X B, Lang J W, et al. A hybrid supercapacitor based on flower-like Co(OH)2 and urchin-like VN electrode materials [J]. Journal of Materials Chemistry A, 2014, 2(32): 12724-12732.

[68] Zhang Y, Zu L, Lian H Q, et al. An ultrahigh performance supercapacitors based on simultaneous redox in both electrode and electrolyte [J]. Journal of Alloys and Compounds, 2017, 694: 136-144.

[69] Zakhidov A A, Suh D S, Kuznetsov A A, et al. Electrochemically tuned properties for electrolyte-free carbon nanotube sheets [J]. Advanced Functional Materials, 2009, 19(14): 2266-2272.

[70] Weng Z, Li F, Wang D W, et al. Controlled electrochemical charge injection to maximize the energy density of supercapacitors [J]. Angewandte Chemie International Edition, 2013, 52(13): 3722-3725.

[71] Lin Z Y, Yan X B, Lang J W, et al. Adjusting electrode initial potential to obtain high-performance asymmetric supercapacitor based on porous vanadium pentoxide nanotubes and activated carbon nanorods [J]. Journal of Power Sources, 2015, 279: 358-364.

[72] Zhu YW, Murali S, Stoller MD, et al. Carbon-based supercapacitors produced by activation of graphene [J]. Science, 2011, 332(6037): 1537–1541.

[73] Zhang H, Zhang X, Sun X, et al. Shape-controlled synthesis of nanocarbons through direct conversion of carbon dioxide [J]. Scientific Repprts, 2013, 3: 3534.

[74] Liu W W, Yan X B, Lang J W, et al. Supercapacitors based on grapheme nanosheets using different non-aqueous electrolyte [J]. New Journal of Chemistry, 2013, 37(7): 2186-2195.

[75] Shi M J, Kou S Z, Yan X B. Engineering the electrochemical capacitive properties of graphene sheets in ionic-liquid electrolytes by correct selection of anions [J]. ChemSusChem, 2014, 7(11): 3053-3062.

[76] Liu W W, Yan X B, Lang J W, et al. Electrochemical behavior of graphene nanosheets in alkylimidazolium tetrafluoroborate ionic liquid electrolytes: influences of organic solvents and the alkyl chains [J]. Journal of Materials Chemistry, 2011, 21(35), 13205–13212.

[77] Liu W W, Yan X B, Lang J W, et al. Effects of concentration and temperature of EMIMBF4/acetonitrile electrolyte on the supercapacitive behavior of graphene nanosheets [J]. Journal of Materials Chemistry, 2012, 22(18), 8853–8861.

[78] An Y F, Yang Y Y, Hu Z A, et al. High-performance symmetric supercapacitors based on carbon nanosheets framework with grapheme hydrogel architecture derived from cellulose acetate [J]. Journal of Power Sources, 2017, 337: 45-53.

[79] Wu G, Tan P F, Wang D X, et al. High-performance supercapacitors based on electrochemical-induced vertical-aligned carbon nanotubes and polyaniline nanocomposite electrodes [J]. Scientific Reports, 2017, 7: 43676.

[80] Tong L Y, Liu J, Boyer S M, et al. Vapor-phase polymerized poly(3,4-ethylenedioxythiophene) (PEDOT)/TiO2 composite fibers as electrode materials for supercapacitors [J]. Electrochimica Acta, 2017, 224: 133-141.

[81] Kim M, Oh I, Kim J. Porous silicon carbide flakes derived from waste silicon wafer for electrochemical supercapacitor [J]. Chemical Engineering Journal, 2016, 289: 170-179.

[82] Xia X H, Zhan J Y, Zhong Y, et al. Single-crystalline, metallic TiC nanowires for highly robust and wide-temperature electrochemical energy storage [J]. Small, 2016, DOI: 10.1002/smll.201602742.

[83] Wang J, Tang J, Ding B, et al. Hierarchical porous carbons with layer-by-layer motif architectures from confined soft-template self-assembly in layered materials [J]. Nature Communications, 2017, 8: 15717.

[84] Rochefort D, Pont A L. Pseudocapacitive behavior of RuO2 in a proton exchenge ionic liquid [J]. Electrochemistry Communications, 2006, 8(9): 1539-1543.

[85] Chang J K, Lee M T, Cheng C W, et al. Pseudocapacitive behavior of Mn oxide in aprotic 1-ethyl-3-methylimidazolium-dicyanamide ionic liquid [J]. Journal of Materials Chemistry, 2009, 19(22): 3732-3738.

[86] Makino S, Takasu Y, Sugimoto W. Electrochemical capacitor properties of NiO in ionic liquids [J]. Chemistry Letters, 2010, 39(6): 544-545.

[87] Sun G H, Li K X, Sun C G, et al. Physical and electrochemical characterization of CuO-doped activated carbon in ionic liquid [J]. Electrochimica Acta, 2010, 55(8): 2667-2672.

[88] Wei D, Scherer M R, Bower C, et al. A nanostructured electrochromic supercpacitor [J]. Nano Letters, 2012, 12(4): 1857-1862.

[89] Egashira M, Saito W, Tokita M, et al. Electrode properties of nickel phthalocyanine/carbon nanotube composite in ionic liquid electrolyte [J]. Electrochemistry, 2013, 81(10): 783-786.

[90] Paravannoor A, Nair S V, Pattathil P, et al. High voltage supercapacitors based on carbon-grafted NiO nanowires interfaced with an aprotic ionic liquid [J]. Chemical Communications, 2015, 51(28): 6092-6095.

[91] Zhang X, Zhao DD, Zhao Y Q, et al. High performance asymmetric supercapacitor based on MnO2 electrode in ionic liquid electrolyte [J]. Journal of Materials Chemistry A, 2013, 1(11): 3706-3712.

[92] Wang H Q, Li Z S, Huang Y G, et al. A novel hybrid supercapacitor based on spherical activated carbon and spherical MnO2 in a non-aqueous electrolyte [J]. Journal of Materials Chemistry, 2010, 20(19): 3883-3889.

[93] Cheng Q, Tang J, Shinya N, et al. Co(OH)2 nanosheet-decorated graphene-CNT composite for supercapacitors of high energy density [J]. Science and Technology of Advanced Materials, 2014, 15(1): 014206(6pp).

[94] Zhu X L, Zhang P, Xu S, et al. Free-standing three-dimensional graphene/manganese oxide hybrids as binder-free electrode materials for energy storage application [J]. ACS Applied Materials & Interfaces, 2014, 6(14): 11665-11674.

[95] Sun S X, Lang J W, Wang R T, et al. Identifying pseudocapacitance of Fe2O3 in an ionic liquid and its application in asymmetric supercapacitors [J], Journal of Materials Chemistry A, 2014, 2(35): 14550-14556.

[96] Shen B S, Zhang X, Guo R S, et al. Carbon encapsulated RuO2 nano-dots anchoring on graphene as an electrode for asymmetric supercapacitors with ultralong cycle life in an ionic liquid electrolyte [J]. Journal of Materials Chemistry A, 2016, 4(21): 8180-8189.

[97] Jung S, Lee J, Hyeon T, et al. Fabric-based integrated energy devices for wearable activity monitors [J]. Advanced Materials, 2014, 26(36): 6329-6334.

[98] Jost K, Durkin D P, Haverhals L M, et al. Natural fiber welded electrode yarns for knittable textile supercapacitors [J]. Advanced Energy Materials, 2015, 5(4): 1401286.

[99] Zhu J, Tang S C, Wu J, et al. Wearable high-performance supercapacitors based on silver-sputtered textiles with FeCo2S4-NiCo2S3 composite nanotube-built multitripod architectures as advanced flexible electrodes [J]. Advanced Energy Materials, 2017, 7(2): 1601234.

[100] Choi C, Kim K M, Kim K J, et al. Improvement of system capacitance via weavable superelastic biscrolled yarn supercapacitors [J]. Nature Communications, 2016, 7: 13811.

[101] Liu W W, Feng Y Q, Yan X B, et al. Superior micro-supercapacitors based on graphene quantum Dots [J]. Advanced Functional Materials, 2012, 23(33): 4111-4122.

[102] Liu W W, Feng Y Q, Chen J T, et la. Novel and high-performance asymmetric micro-supercapacitors based on graphene quantum dots and polyaniline nanofibers [J]. Nanoscale, 2013, 5(13): 6053-6062.

[103] Li N, Zhi C Y, Zhang H Y. High-performance transparent and flexible asymmetric supercapacitor based on graphene-wrapped amorphous FeOOH nanowire and Co(OH)2 nanosheet transparent films produced at air-water interface [J]. Electrochimica Acta, 2016, 220: 618-627.

[104] Ma W J, Chen S H, Yang S Y, et al. Flexible all-solid-state asymmetric supercapacitor based on transition metal oxide nanorods/reduced graphene oxide hybrid fibers with high energy density [J]. Carbon, 2017, 113: 151-158.

[105] Lin R, Zhu Z H, Yu X, et al. Facile synthesis of TiO2/Mn3O4 hierarchical structures for fiber-shaped flexible asymmetric supercapacitors with ultrahigh stability and tailorable performance [J]. Journal of Materials Chemistry A, 2017, 5(2): 814-821.

[106] Kim B C, Too C O, Kwon J S, et al. A flexible capacitor based on conducting polymer electrode [J]. 2011, 161(11): 1130-1132.

[107] Zhao Q, Wang G X, Yan K P, et al. Binder-free porous PEDOT electrodes for flexible supercapacitors [J]. Journal of Applied Polymer Science, 2015, 132(41): 42549.

[108] Barbosa P C, Rodrigues L C, Silva M M, et al. Characterization of pTMCnLiPF6 solid polymer electrolytes [J]. Solid State Ionics, 2011, 193(1): 39-42.

[109] Pérez-Madrigal M M, Edo M G, Díaz A, et al. Poly-γ-glutamic Acid Hydrogels as Electrolyte for Poly(3,4-ethylenedioxythiophene)]-Based Supercapacitors [J]. The Journal of Physical Chemistry C, 2017, 121(6): 3182-3193.

[110] Shi M J, Kou S Z, Shen B S, et al. Improving the performance of all-solid-state supercapacitors by modifying ionic liquid gel electrolytes with graphene nanosheets prepared by arc-discharge [J]. Chinese Chemical Letters, 2014, 25(6): 859-864.

[111] Shen B S, Guo R S, Lang J W, et al. A high-temperature flexible supercapacitor based on pseudocapacitive behavior of FeOOH in an ionic liquid electrolyte [J]. Journal of Materials Chemistry A, 2016, 4(21): 8316-8327.

[112] Deng J, Zhang Y, Zhao Y, et al. A shape-memory supercapacitor fiber [J]. Angewandte Chemie International Edition, 2015, 54(51): 15419-15423.

[113] Zhong J, Meng J, Yang Z, et al. Shape memory fiber supercapacitors [J]. Nano Energy, 2015, 17: 330-338.

[114] Huang Y, Zhu M, Pei Z, et al. A shape memory supercapacitor and its application in smart energy storage textile [J]. Journal of Materials Chemistry A, 2015, 4(4): 1290-1297.

[115] Liu L Y, Shen B S, Jiang D, et al. Watchband-like supercapacitors with body temperature inducible shape memory ability [J]. Advanced Energy Materials, 2016, 6(16): 1600763.

[116] Hu L H, Wu F Y, Lin C T, et al. Graphene-modified LiFePO4 cathode for lithium ion battery beyond [J]. Nature Communications, 2013, 4(2): 1687.

[117] Simon P, Gogotsi Y, Dunn B. Where do batteries end and supercapacitors begins? [J]. Science, 2014, 343(6176): 1210-1211.

[118] Choi N S, Chen Z, Freunberger S A, et al. Challenges facing lithium batteries and electrical double-layer capacitors [J], Angewandte Chemie International Edition, 2012, 51(40): 9994-10024.

[119] 郑宗敏, 张鹏, 阎兴斌, 锂离子混合超级电容器电极材料研究进展[J]. 科学通报, 2013, 58(31): 3115-3123.

[120] Kim H, Cho M Y, Kim M H, et al. A novel high-energy hybrid supercapacitor with an anatase TiO2-reduced graphene oxide anode and an activated carbon cathode [J]. Laser Physics Review, 2013, 3(3): 1500-1506.

[121] Naoi K. ?Nanohybrid Capacitor?: The next generation electrochemical capacitors [J]. Fuel Cells, 2010, 10(5): 825-833.

[122] Aravindan V, Gnanaraj J, Lee Y S, et al. Insertion-type electrodes for nonaqueous Li-ion capacitors. Chemical Reviews, 2014, 114(23): 11619-11635.

[123] Lee J H, Shin W H, Ryou M H, et al. Functionalized graphene for high performance lithium ion capacitors. ChemSusChem, 2012, 5(12): 2328-2333.

[124] Stoller M D, Murali S, Quarles N, et al. Activated graphene as cathode material for Li-ion hybrid supercapacitors [J]. Physical Chemistry Chemical Physics, 2012, 14(10): 3388-3391.

[125] Lee S W, Yabuuchi N, Gallant B M, et al. High-power lithium batteries from functionalized carbon-nanotube electrodes. Nature Nanotechnology, 2010, 5(7): 531-537.

[126] Li B, Dai F, Xiao Q. F, et al. Nitrogen-doped activated carbon for a high energy hybrid supercapacitor [J]. Energy & Environmental Science, 2015, 9(1): 102-106.

[127] Li B, Dai F, Xiao Q F, et al. Activated carbon from biomass transfer for high-energy density lithium-ion supercapacitors [J]. Advanced Energy Materials, 2016, 6(18): 1600802.

[128] Naoi K, Ishimoto S, Miyamoto J, et al. Second generation ‘nanohybrid supercapacitor’: evolution of capacitive energy storage devices [J]. Energy Environmental Science, 2012, 5(11): 9363-9373.

[129] Tang G, Cao L J, Xiao P, et al. A novel high energy hybrid Li-ion capacitor with a three-dimensional hierarchical ternary nanostructure of hydrogen-treated TiO2 nanoparticles/conductive polymer/carbon nanotubes anode and an activated carbon cathode [J]. Journal of Power Sources, 2017, 355: 1-7.

[130] Khomenkoa V, Raymundo-Piñero E, Béguin F. High-energy density graphite/AC capacitor in organic electrolyte [J]. Journal of Power Sources, 2008, 177(2), 643-651.

[131] Naoi K, Ishimoto S, Isobe Y, et al. High-rate nano-crystalline Li4Ti5O12 attached on carbon nano-fibers for hybrid supercapacitors [J]. Journal of Power Sources, 2010, 195(18): 6250-6254.

[132] Lei Y, Huang Z H, Yang Y, et al. Porous mesocarbon microbeads with graphitic shells: constructing a high-rate, high-capacity cathode for hybrid supercapacitor [J]. Scientific Reports, 2013, 3(8): 2477.

[133] Leng K, Zhang F, Zhang L, et al. Graphene-based Li-ion hybrid supercapacitors with ultrahigh performance [J]. Nano Research, 2013, 6(8): 581-592.

[134] Lim E, Kim H, Jo C, et al. Advanced hybrid supercapacitor based on a mesoporous niobium pentoxide/carbon as high-performance anode [J]. ACS Nano, 2014, 8(9): 8968-8978.

[135] Liu S N, Zhou J, Cai Z Y, et al. Nb2O5 quantum dots embedded in MOF derived nitrogen-doped porous carbon for advanced hybrid supercapacitor applications [J]. Journal of Materials Chemistry A, 2016, 4(45): 17838.

[136] Song H, Fu J J, Ding K, et al. Flexible Nb2O5 nanowires/graphene film electrode for high-performance hybrid Li-ion supercapacitors [J]. Journal of Power Sources, 2016, 328: 599-606.

[137] Wang P Y, Wang R T, Lang J W, et al. Porous niobium nitride as a capacitive anode material for advanced Li-ion hybrid capacitor with superior cycling stability [J]. Journal of Materials Chemistry A, 2016, 4(25): 9760-9766.

[138] Yang M, Zhong Y, Ren J J, et al. Fabrication of high-power Li-Ion hybrid supercapacitors by enhancing the exterior surface charge storage [J]. Advanced Energy Materials, 2015, 5: 1500550.

[139] Wang R T, Liu P, Lang J W, et al. Coupling effect between ultra-small Mn3O4 nanoparticles and porous carbon microrods for hybrid supercapacitors [J]. Energy Storage Materials, 2017, 6: 53-60.

[140] Choi H J, Kim J H, Kim H K, et al. Improving the eletrochemical performance of hybrid supercapacitor using well-organized urchin-like TiO2 and activated Carbon [J]. Electrochimica Acta, 2016, 208: 202-210.

[141] Liu W W, Li J D, Feng K, et al. Advanced Li-Ion hybrid supercapacitors based on 3D graphene-foam composites [J]. ACS Applied Materials & Interfaces, 2016, 8(39): 25941-25953.

[142] Chen K F, Xue D F. High energy density hybrid supercapacitor: in-situ functionalization of vanadium-based colloidal cathode [J]. ACS Applied Materials & Interfaces, 2016, 8(43): 29522-29528.

[143] Wang R T, Lang J W, Zhang P, et al. Fast and large lithium storage in 3D porous VN nanowires-graphene composite as a superior anode toward high-performance hybrid supercapacitors [J]. Advanced Functional Materials, 2015, 25(15): 2270-2278.

[144] Come J, Naguib M, Rozier P, et al. A non-aqueous asymmetric cell with a Ti2C-based two-dimensional negative electrode [J]. Journal of The Electrochemical Society, 2012, 159(8): A1368-A1373.

[145] Zhang J, Wu H Z, Wang J, et al. Pre-lithiation design and lithium ion intercalation plateaus utilization of mesocarbon microbeads anode for lithium-ion capacitor [J]. Electrochimica Acta, 2015, 182: 156-164.

[146] Zhang J, Shi Z Q, Wang C Y. Effect of pre-lithiation degrees of mesocarbon microbeads anode on the electrochemical peiformance of lithium-ion capacitors [J]. Electrochimica Acta, 2014, 125(12): 22-28.

[147] 袁美蓉, 刘伟强, 朱永法, 等. 负极嵌锂方式对锂离子电容器性能的影响[J]. 材料导报, 2013, 27(16): 14-16.

[148] Park M S, Lim Y G, Kim J H, et al. A Novel Lithium-Doping Approach for an advanced Lithium Ion Capacitor [J]. Advanced Energy Materials, 2011, 1(6): 1002-1006.



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