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multiscale strain alleviation of Ni-rich cathode guided by in situ environmental transmission electron microscopy during the solid-state synthesis

引用

Journal of Energy Chemistry 2023年第9期84卷 467-475页

作者： Fengyu Zhang Yunna Guo Chenxi Li Tiening Tan Xuedong Zhang Jun Zhao Ping Qiu Hongbing Zhang Zhaoyu Rong Dingding Zhu Lei Deng Zhangran Ye Zhixuan Yu Peng Jia Xiang Liu Jianyu Huang Liqiang Zhang School of New Energy and Materials China University of Petroleum BeijingBeijing 102249China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004HebeiChina School of Materials Science and Engineering Beihang UniversityBeijing 100191China Sichuan New Energy Vehicle Innovation Center Yibin 644000SichuanChina School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105HunanChina Peking University Institute of Advanced Agricultural Sciences Shandong Laboratory of Advanced Agricultural Sciences at WeifangWeifang 261000ShandongChina China Oil&Gas Pipeline Network Corporation Department of Engineering Beijing 100026China Hebei Key Laboratory of Applied Chemistry College of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004HebeiChina Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105HunanChina

Ni-rich layered oxides are one of the most promising cathode materials for Li-ion batteries due to their high energy ***,the chemomechanical breakdown and capacity degradation associated with the anisotropic lattice evolution during lithiation/delithiation hinders its practical ***,by utilizing the in situ environmental transmission electron microscopy(ETEM),we provide a real time nanoscale characterization of high temperature solid-state synthesis of LiNi_(0.8)CO_(0.1)Mn_(0.1)O_(2)(NCM811) cathode,and unprecedentedly reveal the strain/stress formation and morphological evolution mechanism of primary/second ary particles,as well as their influence on electrochemical *** show that stress inhomogeneity during solid-state synthesis will lead to both primary/secondary particle pulverization and new grain boundary initiation,which are detrimental to cathode cycling stability and rate *** to alleviate this multiscale strain during solid-state synthesis,we introduced a calcination scheme that effectively relieves the stress during the synthesis,thus mitigating the primary/secondary particle crack and the detrimental grain boundaries formation,which in turn improves the cathode structural integrity and Li-ion transport kinetics for long-life and high-rate electrochemical *** work remarkably advances the fundamental understanding on mechanochemical properties of transition metal oxide cathode with solid-state synthesis and provides a unified guide for optimization the Ni-rich oxide cathode.

关键词： Ni-rich cathode In situ ETEM Solid-state synthesis multiscale strain alleviation

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