文献类型：期刊文献

英文题名：Dual Modification of Olivine LiFe0.5Mn0.5PO4 Cathodes with Accelerated Kinetics for High-Rate Lithium-Ion Batteries

作者：Jin, Hongbo[1];Zhang, Jiahao[1];Qin, Li[1];Hu, Yanjie[1];Jiang, Hao[2];Li, Chunzhong[2]

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

年份：2023

卷号：62

期号：2

起止页码：1029

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20230213373134);WOS:【SCI-EXPANDED(收录号:WOS:000908452500001)】；

基金：? ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China (21975074) , the Innovation Program of Shanghai Municipal Education Commission, and the Funda-mental Research Funds for the Central Universities.

语种：英文

外文关键词：Cathodes - Coatings - Electron transport properties - Ferroalloys - Ions - Iron compounds - Lithium compounds - Manganese compounds - Niobium compounds - Olivine

摘要：Developing olivine-type lithium ferromanganese phosphates with high ionic/electronic conductivity is vital to promote their practical application in long-life and high-rate lithium-ion batteries (LIBs). Herein, we propose a dual modification strategy combining C-coating and Nb-doping and apply it to enhance LiFe0.5Mn0.5PO4 cathode materials. The uniform and compact C-coating layer successfully fabricates the high-speed conductive network among primary particles and meantime prevents the attack of electrolytes. The strong Nb-O coordination can effectively accelerate ion diffusion and electron transport within the nanoparticles while suppressing the Jahn-Teller effect of Mn3+. The dual modifications synergistically improve the LiFe0.5Mn0.5PO4 cathode materials with superior lithium-storage capacities of 152 and 115 mAh g-1 at 0.1 and 5 C, respectively. Furthermore, it exhibits an impressive cycling performance with an ultrahigh capacity retention of 95.4% after 1000 cycles at 1 C. These findings extend the application of surface-to-bulk co-modification in developing novel cathode materials used in high-performance LIBs.