首页|Insight into structural degradation of NCMs under extreme fast charging process

Insight into structural degradation of NCMs under extreme fast charging process

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Lithium-ion batteries(LIBs)with extreme fast charging(XFC)capability are considered an effective way to alleviate range anxiety for electric vehicle(EV)buyers.Owing to the high ionic and electronic conductivity of LiNixCoyMnzO2(x+y+z=1,NCM)cathodes,the inevitable Li plating of graphite in NCM | graphite cell is usually identified as a key bottleneck for XFC LIBs.However,the capacity decay mechanism of cathode materials under XFC has not been fully investigated.In this work,three typical NCM cathode materials with different Ni fractions were chosen and their electrochemical per-formances under XFC associated with structural evolution were investigated.A faster capacity decay of NCMs under XFC conditions is observed,especially for Ni-rich NCMs.In-situ X-ray diffraction(XRD)reveals that the multiple c-axis parameters appear at the high-voltage regions in Ni-rich NCMs,which is probably triggered by the larger obstruction of Li(de)intercalation.Particularly,NCMs with moderate Ni fraction also present a similar trend under XFC conditions.This phenomenon is more detrimental to the structural and morphological stability,resulting in a faster capacity decay than that under low current charging.This work provides new insight into the degradation mechanism of NCMs under XFC conditions,which can promote the development of NCM cathode materials with XFC capability.

Lithium-ion batteriesNi fractionExtreme fast chargingStructural evolution

Yu Tang、Xing-Yu Wang、Jin-Can Ren、Bo-Wen Chen、Zhi-Yong Huang、Wei Wang、Ya-Lan Huang、Bing-Hao Zhang、Si Lan、Zhang-Long He、Qi Liu、Hao He

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Department of Physics,City University of Hong Kong,Hong Kong 999077,China

Shenzhen Research Institute,City University of Hong Kong,Shenzhen 518057,China

College of Materials Science and Engineering,Changsha University of Science & Technology,Changsha 410114,China

National Key R&D Program of ChinaShenzhen Science and Technology Innovation CommissionShenzhen Science and Technology Innovation CommissionShenzhen Science and Technology Innovation CommissionECS schemeECS schemeECS schemeECS schemeECS schemeShenzhen Research Institute,City University of Hong Kong

2020YFA0406203JCYJ20180507181806316JCYJ20200109105618137SGDX2019081623240948CityU213070197005500700561570056127020043

2024

10.1007/s12598-023-02454-2

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(1)
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