Capacity Fading Analyses of LiNi _0.5Co _0.2Mn _0.3O₂and LiNi _0.5Co _0.2Mn _0.3O₂/LiFePO₄ Cathode Materials for Lithium-Ion Battery

Authors

Yi HU, chool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou510006, Guangdong, China;Follow
Xiang-zhu HE, chool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou510006, Guangdong, China;
Zhong-de DENG, chool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou510006, Guangdong, China;
Ling-yong KONG, Shenzhen Dynanonic Co., Ltd., SShenzhen, Guangdong 518055, China
Wei-li SHANG, Shenzhen Dynanonic Co., Ltd., SShenzhen, Guangdong 518055, China

Corresponding Author

Yi HU(huyi869607143@163.com)

Abstract

The LiNi _0.5Co _0.2Mn _0.3O₂/LiFePO₄ (NMC532/LFP) composite cathode material for lithium-ion battery was prepared by wet ball-milling. The capacity fading behaviors of LiNi _0.5Co _0.2Mn _0.3O₂ (NMC532) and LiNi _0.5Co _0.2Mn _0.3O₂/LiFePO₄ (NMC532/LFP) were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), charge/discharge and electrochemical impedance spectroscopy (EIS) tests. The results indicated that the capacity retention values of NMC532/LFP were 97.80% and 86.48%, respectively, after 50 cycles and 60℃ high temperature storage. The NMC532/LFP exhibited better cycle performance and high temperature storage performance. Charge transfer impedance (Rct) values increased obviously after 50 cycles and high temperature storage, in particular, the R_ct value of NMC532/LFP was smaller. The I(003)/I(104) values of NMC532 and NMC532/LFP were reduced, while that of NMC532/LFP became larger, illustrating the cation mixed phenomenon was improved. There were no apparent particle cracking and particle fracture phenomena observed after 50 cycles, however, some NMC532 powder particles were obtained. The cracks were obaerved on the surface of NMC532 particles and among particles after high temperature storage, and the slight pulverization occurred on the surface of NMC532/LFP particles. Less ordered material structure, higher degree of cation mixing and increased charge transfer resistance might be mainly responsible for the capacity fading behaviors of NMC532 and NMC532/LFP.

Graphical Abstract

Keywords

wet ball-milling, Li-ion battery, composite cathode material, LiNi 0.5Co 0.2Mn 0.3O2/LiFePO4, capacity fading mechanism

DOI Link

https://doi.org/10.13208/j.electrochem.161229

Publication Date

2017-12-28

Online Available Date

2017-02-23

Revised Date

2017-02-20

Received Date

2016-12-29

Recommended Citation

Yi HU, Xiang-zhu HE, Zhong-de DENG, Ling-yong KONG, Wei-li SHANG. Capacity Fading Analyses of LiNi _0.5Co _0.2Mn _0.3O₂and LiNi _0.5Co _0.2Mn _0.3O₂/LiFePO₄ Cathode Materials for Lithium-Ion Battery[J]. Journal of Electrochemistry, 2017 , 23(6): 161229.
DOI: 10.13208/j.electrochem.161229
Available at: https://jelectrochem.xmu.edu.cn/journal/vol23/iss6/15