Suppression of multistep phase transitions of O3-type cathode for sodium-ion batteries  

作　　者：Shengyu Zhao Qinhao Shi Wuliang Feng Yang Liu Xinxin Yang Xingli Zou Xionggang Lu Yufeng Zhao 

机构地区：[1]Institute for Sustainable Energy&College of Sciences,Shanghai University,Shanghai 200444,China [2]State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China

出　　处：《Chinese Chemical Letters》2024年第5期453-458,共6页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22179077,51774251,21908142);Shanghai Science and Technology Commission’s“2020 Science and Technology In-novation Action Plan”(No.20511104003);Natural Science Foundation in Shanghai(No.21ZR1424200)。

摘　　要：O3-type layered oxide cathodes have been widely investigated due to their high reversible capacities and sufficient Na+reservoirs.However,such materials usually suffer from complex multistep phase transitions along with drastic volume changes,leading to the unsatisfied cycle performance.Herein,we report a Mg/Ti co-doped O3-type NaNi_(0.5)Mn_(0.5)O_(2),which can effectively suppress the complex multistep phase transition and realize a solid-solution reaction within a wide voltage range.It is confirmed that,the Mg/Ti co-doping is beneficial to enhance the structural stability and integrity by absorbing micro-strain and distortions.Thus,the as obtained sample delivers an outstanding cyclic performance(82.3%after 200 cycles at 1 C)in the voltage range of 2.0-4.0 V,and a high discharge capacity of 86.6 mAh/g after 100 cycles within the wide voltage range(2.0-4.5 V),which outperform the existing literatures.This co-doping strategy offers new insights into high performance O3-type cathode for sodium ion batteries.

关 键 词：Sodium ion batteries Mg/Ti co-doping Phase transition Cyclic performance High voltage performance 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.12[化学工程—无机化工]