Synthesis and Electrochemical Properties of Li(Ni_0.5Co_0.2Mn_0.3)_1-2xTi_xNb_xO₂

Authors

Yong TANG, Zhaoqing Fenghua Lithium Battery Co., Ltd, Zhaoqing Guangdong, China, 526040;Follow
Qin-lin LIAO, Zhaoqing Fenghua Lithium Battery Co., Ltd, Zhaoqing Guangdong, China, 526040;
Xiang-an GUO, Zhaoqing Fenghua Lithium Battery Co., Ltd, Zhaoqing Guangdong, China, 526040;

Corresponding Author

Yong TANG(zqty623@sina.com)

Abstract

The cathode-active materials of layered Li(Ni_0.5Co_0.2Mn_0.3)_1-2xTi_xNb_xO₂（x=0, 0.002, 0.005, 0.01, 0.02）composites were synthesized by the thermal treatment of the coprecipitated precursor at 900 ^oC in air. The effects of Ti-Nb co-dopants on the structural and electrochemical properties of Li(Ni_0.5Co_0.2Mn_0.3)O₂ were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical experiments. The results show that the small amounts of Ti-Nb co-dopants in Li(Ni_0.5Co_0.2Mn_0.3)O₂significantly decreased the degree of cation mixing in the layered structure. The lattice parameters increased as the doping contents increased. The Ti-Nb co-doped composite materials exhibited better electrical properties and high temperature performance compared to Li(Ni_0.5Co_0.2Mn_0.3)O₂. The best overall performance of Li(Ni_0.5Co_0.2Mn_0.3)_1-2xTi_xNb_xO₂ was achieved with square battery when x=0.005. The initial specific discharge capacity of 165.9 mAh·g^-1 under 1C rate in a voltage range of 3.0 ~ 4.2 V was obtained with the capacity retention of 96.5% after 100th cycles at ambient temperature and the capacity retention of 92.6% after 300th cycles at 55 ^oC. The thickness swelling rate of the square battery was 9.8% when cooling down for two hours after being stored at 80 ^oC/6 h.

Graphical Abstract

Keywords

lithium ion battery, cathode, Li(Ni0.5Co0.2Mn0.3)O2, Ti-Nb co-dopants

DOI Link

https://doi.org/10.61558/2993-074X.2123

Publication Date

2013-08-28

Online Available Date

2012-04-10

Revised Date

2012-03-23

Received Date

2012-01-12

Recommended Citation

Yong TANG, Qin-lin LIAO, Xiang-an GUO. Synthesis and Electrochemical Properties of Li(Ni_0.5Co_0.2Mn_0.3)_1-2xTi_xNb_xO₂[J]. Journal of Electrochemistry, 2013 , 19(4): 371-375.
DOI: 10.61558/2993-074X.2123
Available at: https://jelectrochem.xmu.edu.cn/journal/vol19/iss4/10

References

[1] Dahn J R, Von Sacken U, Michal C A. Structure and electrochemistry of Li1±yNiO2 and a new Li2NiO2 phase with the Ni(OH)2 structure[J]. Solid state Ionics, 1990, 44(1/2): 87-97.

[2] Liu Z, Yu A, Lee J Y. Synthesis and characterization of LiNi1-x-yCoxMnyO2 as the cathode materials of secondary lithium batteries[J]. Journal of Power Sources, 1999, 81-82: 416-419.

[3] Andersson A M, Edstrom K. Chemical composition and morphology of the elevated temperature SEI on graphite[J]. Journal of the Electrochemical Society, 2001, 148(10): A1100-A1109.

[4] Liu H. A comparative study of LiNi0.8Co0.2O2 cathode materials modified by lattice-doping and surface-coating[J]. Solid state Ionics, 2004, 166(3/4): 317-325.

[5] Chernova N A, Ma M, Xiao J, et al. Layered LixNiyCoyMn1-2yO2 cathodes for lithium ion batteries: understanding local structure via magnetic properties[J]. Chemistry of Materials, 2007, 19(19): 4682-4693.

[6] Ni J, Zhou H, Chen J, et al. Improved electrochemical performance of layered LiNi0.4Co0.2Mn0.4O2 via Li2ZrO3 coating[J]. Electrochimica Acta, 2008, 53(7): 3075-3083.

[7] Huang Y, Chen J, Cheng F, et al. A modified Al2O3 coating process to enhance the electrochemical performance of Li(Ni1/3Co1/3Mn1/3) O2 and its comparison with traditional Al2O3 coating process[J]. Journal of Power Sources, 2010, 195(24): 8267-8274.

[8] Yang Z(杨志), Li X H(李新海), Wang Z X(王志兴), et al. Synthesis and characterization of high-density spherical LiNi0.5Co0.3Mn0.2O2 by carbonate coprecipitating[J]. Chinese Journal of Power Sources(电源技术), 2009, 33(10): 869-872.

[9] Liu W(刘文), Wang M(王苗), Chen J T(陈继涛), et al. Synthesis of LiNi0.5Co0.2Mn0.3O2 for Lithium ion batteries and the mechanism of capacity fading at high temperature[J]. Journal of Electrochemistry (电化学), 2012, 18(2): 118-124.

[10] Todorov Y M, Numata K. Effects of the Li:(Mn+Co+Ni) molar ratio on the electrochemical properties of LiMn1/3Co1/3Ni1/3O2 cathode material[J]. Electrochemica Acta, 2004, 50(2/3): 495-499.

[11] Oh S H, Lee S M, Cho W I, et al. Electrochemical characterization of zirconium-doped LiNi0.8Co0.2O2 cathode materials and investigations on deterioration mechanism[J]. Electrochemical Acta, 2006, 51(38): 3637-3644.

[12] Liao L(廖力), Wang X Y(王先友), Luo X F(罗旭芳), et al. Synthesis and electrochemical properties of Li(Ni1/3Co1/3Mn1/3)1-2xMgxAlxO2[J]. Chinese Journal of Power Sources(电源技术), 2007, 31(1): 26-29.