Degradation Analysis of LiNi0.8Co0.15Al0.05O2 Positive-electrode Active Material and Its Modification Methods
QIU Zhenping1, ZHANG Yingjie1,2, DONG Peng2, XIA Shubiao2, YAO Yao2
1 Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093; 2 Engineering Laboratory for Advanced Batteries and Materials of Yunnan Province, Kunming 650093
Abstract: LiNi0.8Co0.15Al0.05O2 lithium ion batteries have extremely broad application prospect in electric vehicles and statio-nary storage batteries due to its high capacity and high power. To be more economically attractive, it requires the batteries to have a long life during both storage and operation, typically more than 15 years. However, it still remains a challenge to achieve this goal, that is to say the short service life of LIB is a technological bottleneck for its application in electronic vehicles. Therefore, investigating the degradation mechanism of lithium-ion cell plays an important role in the achievement of long life for lithium-ion cell. Extensive research has shown that the formation of surface film, appearance of a NiO-like resistance layer with Fm3m rock structure, the micro-crack generation and deterioration of conductive carbon matrix are considered to be the dominant factors for the degradation of capacity and power. The deterioration of the cathode can be suppressed to a certain degree by the conventional modification methods, such as atomic doping, surface coating.
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2017, Vol. 31 
