首页|Alleviating the anisotropic microstructural change and boosting the lithium ions diffusion by grain orientation regulation for Ni-rich cathode materials

Alleviating the anisotropic microstructural change and boosting the lithium ions diffusion by grain orientation regulation for Ni-rich cathode materials

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Generally,layered Ni-rich cathode materials exhibit the morphology of polycrystalline secondary sphere composed of numerous primary particles.While the arrangement of primary particles plays a very important role in the properties of Ni-rich cathodes.The disordered particle arrangement is harmful to the cyclic performance and structural stability,yet the fundamental understanding of disordered struc-ture on the structural degradation behavior is unclarified.Herein,we have designed three kinds of LiNi0.83Co0.06Mn0.11O2 cathode materials with different primary particle orientations by regulating the precursor coprecipitation process.Combining finite element simulation and in-situ characterization,the Li+transport and structure evolution behaviors of different materials are unraveled.Specifically,the smooth Li+diffusion minimizes the reaction heterogeneity,homogenizes the phase transition within grains,and mitigates the anisotropic microstructural change,thereby modulating the crack evolution behavior.Meanwhile,the optimized structure evolution ensures radial tight junctions of the primary par-ticles,enabling enhanced Li+diffusion during dynamic processes.Closed-loop bidirectional enhancement mechanism becomes critical for grain orientation regulation to stabilize the cyclic performance.This pre-cursor engineering with particle orientation regulation provides the useful guidance for the structural design and feature enhancement of Ni-rich layered cathodes.

Ni-rich cathodeGrain orientation regulationAnisotropic microstructural changePrecursor engineeringLi+-ions diffusion

Xinyou He、Shilin Su、Bao Zhang、Zhiming Xiao、Zibo Zhang、Xing Ou

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Engineering Research Center of the Ministry of Education for Advanced Battery Materials,School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China

Zhejiang Power New Energy Co.Ltd,Zhuji 311899,Zhejiang,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Hunan Province

52070194520733092022JJ20069

2024

10.1016/j.jechem.2023.09.022

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.88(1)
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