A Comparative Investigation of Single Crystal and Polycrystalline Ni-Rich NCMs as Cathodes for Lithium-Ion Batteries

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外文摘要：Nickel-rich LiNi1-x-yCoxMnyO2(NCM,1-x-y ≥ 0.6)is known as a promising cathode material for lithium-ion batteries since its superiority of high voltage and large capacity.However,polycrystalline Ni-rich NCMs suffer from poor cycle stability,limiting its further application.Herein,single crystal and polycrystalline LiNi0.84Co0.07Mn0.09O2 cathode materials are compared to figure out the relation of the morphology and the electrochemical storage performance.According to the Li+diffusion coefficient,the lower capacity of single crystal samples is mainly ascribed to the limited Li+diffusion in the large bulk.In situ XRD illustrates that the polycrystalline and single crystal NCMs show a virtually identical manner and magnitude in lattice contraction and expansion during cycling.Also,the electrochemically active surface area(ECSA)measurement is employed in lithium-ion battery study for the first time,and these two cathodes show huge discrepancy in the ECSA after the initial cycle.These results suggest that the single crystal sample exhibits reduced cracking,surface side reaction,and Ni/Li mixing but suffers the lower Li+diffusion kinetics.This work offers a view of how the morphology of Ni-rich NCM effects the electrochemical performance,which is instructive for developing a promising strategy to achieve good rate performance and excellent cycling stability.

外文关键词：

cathodeselectrochemically active surface areaLi+diffusion coefficientlithium-ion batteriessingle crystal

作者：

Xianming Deng、Rui Zhang、Kai Zhou、Ziyao Gao、Wei He、Lihan Zhang、Cuiping Han、Feiyu Kang、Baohua Li

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作者单位：

Shenzhen Key Laboratory of Power Battery Safety and Shenzhen Geim Graphene Center,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China

School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

EVE Energy Co.,Ltd.,No.38,Hui Feng 7th Road,Zhongkai Hi-Tech Zone,HuiZhou Guangdong 516006,China

Shenzhen Key Laboratory of Energy Materials for Carbon Neutrality and Faculty of Materials Science and Engineering,Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China

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基金：

国家自然科学基金国家自然科学基金Shenzhen Technical Plan ProjectFundamental Research Project of ShenzhenLocal Innovative and Research Teams Project of Guangdong Pearl River Talents ProgramMaterials and Devices Testing Center of Tsinghua University Shenzhen International Graduate School(Tsinghua SIGS)

项目编号：

5187215752072208JCYJ20170817161753629JCYJ201908081536095612017BT01N111

出版年：

2023

DOI：

10.1002/eem2.12331

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(3)

参考文献量48