Stabilizing oxygen redox reaction in phase-transition-free P2-type Co/Nifree cathode via Cu doping for sodium-ion batteries

作     者：Hai-Xia Zhang Lin-Rong Wu Hao-Rui Wang Dong-Zheng Wu Shao-Hui Guo Ding Zhang Xiao-Chuan Duan Xian-Ming Zhang 张海霞;吴林蓉;王皓睿;武东政;郭绍晖;张鼎;段小川;张献明

作者机构：College of Chemical Engineering and TechnologyTaiyuan University of TechnologyTaiyuan 030024China School of Chemical Engineering and PharmacyWuhan Institute of TechnologyWuhan 430205China 

基　　金：financially supported by the National Natural Science Foundation of China(22271211) the Natural Science Foundation of Shanxi Province(20210302123107 and 202202060301018) 

出 版 物：《Science China Materials》 (中国科学（材料科学）（英文版）)

年 卷 期：2024年第67卷第11期

页      码：3629-3636页

摘      要：Due to their high capacity,the P2-type layered oxide cathodes containing oxygen redox reaction processes have attracted wide attention for sodium-ion ***,these materials usually exhibit poor electro-chemical properties,resulting from irreversible oxygen redox reactions and phase transition processes at high voltages,and thus hinder their large-scale *** work reveals the mechanism for the significantly improved cycle stability and rate performance of Co/Ni-free Na_(0.7)5Li_(0.25-2/3x)CuxMn_(0.75-1/3x)O_(2)via Cu ***-situ XPS demonstrates that Cu doping reduces the amount of Mn^(3+)that triggers the Jahn-Teller effect during the *** addition,the electron enrichment of oxygen around Cu can alleviate the irreversible oxidation of oxygen,and thus suppressing the phase transition originates from the rapid weakening of the electrostatic repulsion between ***,in-situ XRD results verify that the Na_(0.7)5Li_(0.19)Cu_(0.09)Mn_(0.7)2O_(2)maintains the P2 phase structure during charging and discharging,resulting in a near-zero strain characteristic of 1.9%.Therefore,the optimized cathode delivers a high reversible capacity of 194.9 mAh g−1 at 0.1 C and excellent capacity retention of 88.6%after 100 cycles at 5 *** full cell paired with commercial hard carbon anode delivers energy density of 240 Wh kg−*** research provides an idea for designing a new type of intercalated cathode for sodium-ion batteries with low cost and high energy density.

主 题 词：sodium-ion batteries Co/Ni-free Cu doping oxygen redox reaction phase transition. 

学科分类：0808[工学-自动化类] 081704[081704] 08[工学] 0817[工学-轻工类] 

核心收录：

D　O　I：10.1007/s40843-024-3081-9

馆 藏 号：203143932...