Enabling Structure/Interface Regulation for High Performance Ni-Rich Cathodes

Ni, Lianshan; Chen, Hongyi; Guo, Shuai; Dai, Alvin; Gao, Jinqiang; Yu, Lei; Mei, Yu; Wang, Haoji; Long, Zhen; Wen, Jianguo; Deng, Wentao; Zou, Guoqiang; Hou, Hongshuai; Liu, Tongchao; Amine, Khalil; Ji, Xiaobo

doi:10.1002/adfm.202307126

DOE OSTI · 2371815

Enabling Structure/Interface Regulation for High Performance Ni-Rich Cathodes

Ni, Lianshan·Chen, Hongyi·Guo, Shuai·Dai, Alvin·Gao, Jinqiang·Yu, Lei·Mei, Yu·Wang, Haoji·Long, Zhen·Wen, Jianguo·Deng, Wentao·Zou, Guoqiang·Hou, Hongshuai·Liu, Tongchao·Amine, Khalil·Ji, Xiaobo

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Abstract

Here, further commercialization of Ni-rich layered cathodes is hindered by severe structure/interface degradation and kinetic hindrance that occur during electrochemical operation, which leads to safety risks and reduced range in electric vehicles (EVs). Herein, by selecting elements with different solubility properties, a multifunctional strategy that synchronously fabricates perovskite-type SrZrO 3 coating and Sr/Zr co-doping is employed to strengthen the structure/interface stability and the Li + transport mobility of LiNi 0.85 Co 0.10 Mn 0.05 O 2 (NCM). Perovskite-type SrZrO 3 protective layers formed on the particle surface can substantially mitigate the unexpected interfacial side reactions and surface phase transitions. In addition, a robust crystal framework is constructed by optimizing local O coordination through the introduction of strong Zr-O bonds. Notably, Li + diffusion kinetics is effectively improved due to expanded cell parameters and O-Li-O slab spacing with the incorporation of large-diameter Sr pillar ions, as revealed by X-ray diffraction. As a result, the Sr/Zr-modified NCM achieves a remarkable capacity retention of 99.4% after 200 cycles at 1 C, and a high rate capacity of 168.9 mAh g -1 at 10 C. This work opens new avenues to develop high-performance NCM cathodes with high energy and high power for EVs with long calendar life.

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25 ENERGY STORAGE Li+ diffusion kinetics Ni-rich layered cathodes Sr2+/Zr4+ co-doping SrZrO3 coating structure/interface stability

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Ni, Lianshan, Chen, Hongyi, Guo, Shuai, Dai, Alvin, Gao, Jinqiang, Yu, Lei, Mei, Yu, Wang, Haoji, Long, Zhen, Wen, Jianguo, Deng, Wentao, Zou, Guoqiang, Hou, Hongshuai, Liu, Tongchao, Amine, Khalil, Ji, Xiaobo. 2023-08-22. Enabling Structure/Interface Regulation for High Performance Ni-Rich Cathodes. https://doi.org/10.1002/adfm.202307126

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