文献类型：期刊文献

英文题名：Lithium-conductive LiNbO3 coated high-voltage LiNi0.5Co0.2Mn0.3O2 cathode with enhanced rate and cyclability

作者：Yu, Haifeng[1];Wang, Shouliang[1];Hu, Yanjie[1];He, Guanjie[2];Bao, Le Quoc[3];Parkin, Ivan P.[2];Jiang, Hao[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Engn Res Ctr Hierarch Nanomat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]UCL, Dept Chem, Christopher Ingold Lab, 20 Gordon St, London WC1H 0AJ, England;[3]Ton Duc Thang Univ, Fac Sci Appl, 19 Nguyen Huu Tho,Dist 7, Ho Chi Minh City, Vietnam

年份：2022

卷号：7

期号：2

起止页码：266

外文期刊名：GREEN ENERGY & ENVIRONMENT

收录：;EI(收录号：20220711662828);WOS:【SCI-EXPANDED(收录号:WOS:000760171700008)】；

基金：This work was supported by the National Natural Science Foundation of China (21975074, 91534202, and 91834301) , the Shanghai Scientific and Technological Innovation Project (18JC1410500) , and the Fundamental Research Funds for the Central Universities (222201718002) .

语种：英文

外文关键词：NCM523; Surface coating; Confined synthesis; Cycling stability; Li-ion batteries

摘要：LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode materials can operate at extremely high voltages and have exceptional energy density. However, their use is limited by inherent structure instability during charge/discharge and exceptionally oxidizing Ni4+ at the surface. Herein, we have developed a citrate-assisted deposition concept to achieve a uniform lithium-conductive LiNbO3 coating layer on the NCM523 surface that avoids self-nucleation of Nb-contained compounds in solution reaction. The electrode-electrolyte interface is therefore stabilized by physically blocking the detrimental parasitic reactions and Ni4+ dissolution whilst still maintaining high Li+ conductivity. Consequently, the modified NCM523 exhibits an encouraging Li-storage specific capacity of 207.4 mAh g(-1) at 0.2 C and 128.9 mAh g(-1) at 10 C over the range 3.0-4.5 V. Additionally, a 92% capacity retention was obtained after 100 cycles at 1 C, much higher than that of the pristine NCM523 (73%). This surface engineering strategy can be extended to modify other Ni-rich cathode materials with durable electrochemical performances. (C) 2020 Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.