文献类型：期刊文献

英文题名：A Novel Perovskite Electron–Ion Conductive Coating to Simultaneously Enhance Cycling Stability and Rate Capability of Li1.2Ni0.13Co0.13Mn0.54O2 Cathode Material for Lithium-Ion Batteries

作者：Gao, Mingxi[1]; Yan, Chenhui[1]; Shao, Qinong[1]; Chen, Jian[2]; Zhang, Chenyang[3]; Chen, Gairong[3]; Jiang, Yinzhu[1]; Zhu, Tiejun[1]; Sun, Wenping[1]; Liu, Yongfeng[1]; Gao, Mingxia[1]; Pan, Hongge[1]

第一作者：Gao, Mingxi

通讯作者：Gao, Mingxia

机构：[1] State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China; [2] Institute of Science and Technology for New Energy, Xi'an Technological University, Xi'an, 710021, China; [3] College of Chemistry and Chemical Engineering, Xinxiang University, Xinxiang, 453003, China

第一机构：State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

通讯机构：[1]State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China;[1]State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

年份：2021

卷号：17

期号：19

外文期刊名：Small

收录：EI(收录号：20211310143834);Scopus(收录号：2-s2.0-85103209467)

语种：英文

外文关键词：Transition metals - Cathodes - Diffusion coatings - Stability - Ions - Lithium compounds - Neodymium compounds - Nickel compounds - Perovskite - Electric conductivity - Strontium compounds

摘要：Poor cycling stability and rate capability are two key issues needing to be solved for Li- and Mn-rich oxide cathode material for lithium-ion batteries (LIBs). Herein, a novel perovskite electron–ion mixed conductor Nd0.6Sr0.4CoO3 (NSCO) is used as the coating layer on Li1.2Ni0.13Co0.13Mn0.54O2 (LNCMO) to simultaneously enhance its cycling stability and rate capability. By coating 3 wt% NSCO, LNCMO–3NSCO exhibits an optimal cycling performance with a capacity retention of 99% at 0.1C (1C = 200?mA g?1) after 60 cycles, 91% at 1C after 300 cycles, and 54% at 20C after 1000 cycles, much better than 78%, 63%, and 3% of LNCMO, respectively. Even at a high charge and discharge rate of 50C, LNCMO–3NSCO exhibits a discharge capacity of 53?mAh?g?1 and a mid-point discharge voltage of 2.88?V, much higher than those of LNCMO (24?mA?h?g?1 and 2.40?V, respectively). Benefiting from the high electronic conductivity (1.46?S?cm?1) and ionic conductivity (1.48 × 10?7?S?cm?1), NSCO coating not only suppresses transition metals dissolution and structure transformation, but also significantly enhances electronic conductivity and Li+ diffusion coefficient of LNCMO by an order of magnitude. ? 2021 Wiley-VCH GmbH