文献类型：期刊文献

英文题名：Nitrogen-doped carbon stabilized LiFe0.5Mn0.5PO4/rGO cathode materials for high-power Li-ion batteries

作者：Yu, Haifeng[1];Yang, Zhaofeng[2];Zhu, Huawei[1];Jiang, Hao[1,2];Li, Chunzhong[1,2]

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

年份：2020

卷号：28

期号：7

起止页码：1935

外文期刊名：CHINESE JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20202108685691);WOS:【SCI-EXPANDED(收录号:WOS:000566748300023)】；

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：Cathode materials; High power density; Carbon; Long cycle life; Li-ion batteries

摘要：Exploring high ion/electron conductive olivine-type transition metal phosphates is of vital significance to broaden their applicability in rapid-charging devices. Herein, we report an interface engineered LiFe0.5Mn0.5PO4/rGO@C cathode material by the synergistic effects of rGO and polydopamine-derivedN-doped carbon. The well-distributed LiFe0.5Mn0.5PO4 nanoparticles are tightly anchored on rGO nanosheet benefited by the coating of N-doped carbon layer. The design of such an architecture can effectively suppress the agglomeration of nanoparticles with a shortened Li+ transfer path. Meantime, the high-speed conducting network has been constructed by rGO and N-doped carbon, which exhibits the face-to-face contact with LiFe0.5Mn0.5PO4 nanoparticles, guaranteeing the rapid electron transfer. These profits endow the LiFe0.5Mn0.5PO4/rGO@C hybrids with a fast charge-discharge ability, e.g. a high reversible capacity of 105 mAh.g(-1) at 10 C, much higher than that of the LiFe0.5Mn0.5PO4@C nanoparticles (46 mA.h.g(-1)). Furthermore, a 90.8% capacity retention can be obtained even after cycling 500 times at 2 C. This work gives a new avenue to fabricate transition metal phosphate with superior electrochemical performance for high-powerLi-ion batteries. (C) 2020 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.