P2-type Na_(0.6)[Mg(Ⅱ)_(0.3)Mn(Ⅳ)_(0.7)]O_2 as a new model material for anionic redox reaction

作     者：Xiaohui Rong Fei Gao Yaxiang Lu Kai Yang Yongsheng Hu 

作者机构：State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and Devices Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2018年第29卷第12期

页      面：1791-1794页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by funding from Science and Technology Project of the State Grid Corporation of China("research on key technology of low-strain layered oxides for long-life Na-ion batteries" No.DG71-16-027) 

主　　题：Na-ion batteries Layered oxide Cathode Anionic redox reaction Na_(0.6)[Mg_(0.3)Mn_(0.7)]O_2 

摘      要：A new model material of Na[Mg(Ⅱ)Mn(Ⅳ)]O, with only Mgand Mnin the transition metal layers, is synthesized for the research of anionic redox reaction. The material delivers a capacity of ～130 mAh/g with a long plateau at ～4.2 V in the initial charge profile, indicating anionic redox reaction(ARR) involved during the initial desodiation process. In the following cycles, the reversible capacity can reach a high value of ～210 mAh/g, which is probably derived from the participation of both ARR and Mn/Mnredox couples, further proving the charge compensation from ARR during the initial charge and following cycles. The designed cathode material without Mnhelps avoid the influence of oxygen activity from transition metals, enabling the investigation of ARR without other distractions.