Synthesis and Electrochemical Performance of Nano LiCoPO₄ by Polyol Method

Authors

Fei WANG, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
YANG Jun, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaFollow

Corresponding Author

YANG Jun(yangj723@sjtu.edu.cn)

Abstract

High potential LiCoPO₄ cathode material was synthesized by polyol method. Carbon layer of ca. 3 nm thick was coated on the LiCoPO4 surfaces by chemical vapor deposition from methylbenzene. Crystalline structure, morphology and electrochemical performance of the sample were studied by XRD, SEM, TEM, CV and galvanostatic charge/discharge curve. The synthesized material via polyol method showed a pure phase of LiCoPO₄. The LiCoPO₄/C electrode delivered a high discharge capacity of 132 mAh·g^-1 and maintained 78% of the initial capacity after 50 cycles at 0.1C rate. The two-step extraction/insertion behavior of Li⁺ in LiCoPO4/C was observed from cyclic voltammogram and differential capacitance curves.

Graphical Abstract

Keywords

polyol method, LiCoPO4, chemical vapor deposition, carbon coating

DOI Link

https://doi.org/10.13208/j.electrochem.130355

Publication Date

2013-12-28

Online Available Date

2013-12-23

Revised Date

2013-05-25

Received Date

2013-05-08

Recommended Citation

Fei WANG, YANG Jun. Synthesis and Electrochemical Performance of Nano LiCoPO₄ by Polyol Method[J]. Journal of Electrochemistry, 2013 , 19(6): 130355.
DOI: 10.13208/j.electrochem.130355
Available at: https://jelectrochem.xmu.edu.cn/journal/vol19/iss6/15

References

[1] Liu J, Conry T E, Song X, et al. Spherical nanoporous LiCoPO4/C composites as high performance cathode materials for rechargeable lithium-ion batteries[J]. Journal of Materials Chemistry, 2011, 21(27): 9984-9987.

[2] Markevich E, Sharabi R, Gottlieb H, et al. Reasons for capacity fading of LiCoPO4 cathodes in LiPF6 containing electrolyte solutions[J]. Electrochemistry Communications, 2012, 15(1): 22-25.

[3] Oh S M, Myung S T, Sun Y K. Olivine LiCoPO4-carbon composite showing high rechargeable capacity[J]. Journal of Materials Chemistry, 2012, 22(30):14932-14937.

[4] Li H H, Jin J, Wei J P, et al. Fast synthesis of core-shell LiCoPO4/C nanocomposite via microwave heating and its electrochemical Li intercalation performances[J]. Electrochemistry Communications, 2009, 11(1): 95-98

[5] Eftekhari A. Surface modification of thin-film based LiCoPO4 5 V cathode with metal oxide[J]. Journal of The Electrochemical Society, 2004, 151(9): A1456-A1460.

[6] Ni J, Wang H, Gao L, et al. A high-performance LiCoPO4/C core/shell composite for Li-ion batteries[J]. Elecrtochimica Acta, 2012, 70: 349-354.

[7] Wolfenstine J, Read J, Allen J L. Effect of carbon on the electronic conductivity and discharge capacity LiCoPO4[J]. Journal of Power Sources, 2007, 163(2): 1070-1073.

[8] Doan T N L. Taniguchi I. Preparation of LiCoPO4/C nanocomposite cathode of lithium batteries with high rate performance[J]. Journal of Power Sources, 2011, 196(13): 5679-5684.

[9] Wang S L(王绍亮), Tang Z Y(唐致远), Sha O(沙鸥), et al. Synthesis and electrochemical performance of LiCoPO4 by sol-gel method[J]. Acta Physico-Chimica Sinica (物理化学学报), 2012, 28(2): 343-348.

[10] Xie J, Imanishi N, Zhang T, et al. Li-ion diffusion kinetics in LiCoPO4 thin films deposited on NASICON-type glass ceramic electrolytes by magnetron sputtering[J]. Journal of Power Sources, 2009, 192 (2): 689-692.

[11] Bramnik N N, Bramnik K G, Baehtz C, et al. Study of the effect of different synthesis routes on Li extraction-insertion from LiCoPO4[J]. Journal of Power Sources, 2005, 145(1): 74-81.