文献类型：期刊文献

英文题名：Unique insights into the design of low- strain single- crystalline Ni- rich cathodes with superior cycling stability

作者：Han, Qiang[1];Yu, Haifeng[2];Cai, Lele[1];Chen, Ling[1];Li, Chunzhong[1,2];Jiang, Hao[1]

机构：[1]East China Univ Sci & Technol, Key Lab Ultrafine Mat, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn,Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：121

期号：10

外文期刊名：PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001232649800003)】；

基金：ACKNOWLEDGMENTS.This work was supported by the National Natural Science Foundation of China (U22A20429) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：lithium- ion batteries; single- crystalline; Ni-rich cathodes; strain engineering; cycle stability

摘要：Micro- sized single- crystalline Ni- rich cathodes are emerging as prominent candidates owing to their larger compact density and higher safety compared with poly- crystalline counterparts, yet the uneven stress distribution and lattice oxygen loss result in the intragranular crack generation and planar gliding. Herein, taking LiNi0.83Co0.12Mn0.05O2 as an example, an optimal particle size of 3.7 mu m is predicted by simulating the stress distributions at various states of charge and their relationship with fracture free- energy, and then, the fitted curves of particle size with calcination temperature and time are further built, which guides the successful synthesis of target- sized particles (m- NCM83) with highly ordered layered structure by a unique high- temperature short- duration pulse lithiation strategy. The m- NCM83 significantly reduces strain energy, Li/O loss, and cationic mixing, thereby inhibiting crack formation, planar gliding, and surface degradation. Accordingly, the m- NCM83 exhibits superior cycling stability with highly structural integrity and dual- doped m- NCM83 further shows excellent 88.1% capacity retention.