文献类型：期刊文献

英文题名：Mechanical Degradation Behavior of Single Crystal LiNixMnyCozO2 Cathode in Li-Ion Battery by Indentation Analysis

作者：Chen, Ying[1];Luan, Weiling[1];Zhu, Xuanchen[2];Chen, Haofeng[2]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China;[2]Univ Strathclyde, Dept Mech & Aerosp Engn, Glasgow G1 1XJ, Scotland

年份：2022

卷号：144

期号：5

外文期刊名：JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME

收录：;EI(收录号：20225213314343);WOS:【SCI-EXPANDED(收录号:WOS:000881468400016)】；

基金：China Scholarship Council (Funder ID: 10.13039/501100004543). Fundamental Research Funds for the Central Universities (Grant No. JKG01211523; Funder ID: 10.13039/501100012226). National Natural Science Foundation of China (Grant Nos. 52150710540 and 51828501; Funder ID: 10.13039/501100001809). Higher Education Discipline Innovation Project (111 Project) (Funding Code B13020; Funder ID: 10.13039/501100013314). University of Strathclyde and East China University of Science and Technology (Funder IDs: 10.13039/100008078 and 10.13039/501100003021).

语种：英文

外文关键词：single crystal NMC; degradation; elastic modulus; hardness; electrochemical cycles

摘要：LiNixMnyCozO2 (NMC) is among the most promising cathode materials for commercial Li-ion batteries due to its high electrochemical performance. However, NMC composite cathode is still plagued with limited cyclic performance, which is influenced by its structural stability during the cycling process. The cathode, which comprises of the active material, polymeric binder, and porous conductive matrix, often exhibits large structural variation during the electrochemical cycling process. This inevitably increases the challenge of measuring the mechanical properties of the material. Even though single crystal NMC possesses better stability as compared to the polycrystalline NMC, the electrochemical performance degradation of single crystal NMC cathode remains relatively unexplored. Different sample preparation methods are compared systematically in accordance to the previous report, and a new method of sample preparation is proposed. Nano-indentation instrument is used to measure the elastic modulus and hardness of the single crystal NMC particles. The measured elastic modulus and hardness of NMC particles, under different electrochemical environments, are dependent on a large number of nano-indentation experiments and statistical analysis of the results obtained from the carefully prepared samples. The sample preparation method is the key factor that can significantly influence the nano-indentation experiment results of the NMC particles. This work shows that the mechanical properties of the single crystal NMC particles degrade significantly with number of electrochemical cycles. The decreasing elastic modulus with the number of electrochemical cycles can be fitted using a two-parameter logarithm model.