A water-stable high-voltage P3-type cathode for sodium-ion batteries  

作　　者：Shengyu Zhao Xuan Yu Yufeng Zhao 

机构地区：[1]Institute for Sustainable Energy&College of Sciences,Shanghai University,Shanghai 200444,China

出　　处：《Chinese Chemical Letters》2024年第9期507-513,共7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：The Na-deficient P3-type layered oxide cathode material usually experience complex in-plane Na^(+)/vacancy ordering rearrangement and undesirable P3-O3 phase transitions in the high-voltage region,leading to inferior cycling performance.Additionally,they exhibit unsatisfactory stability when exposed to water for extended periods.To address these challenges,we propose a Cu/Ti co-doped P3-type cathode material(Na_(0.67)Ni_(0.3)Cu_(0.03)Mn_(0.6)Ti_(0.07)O_(2)),which effectively mitigates Na^(+)/vacancy ordering and suppresses P3-O3 phase transitions at high voltages.As a result,the as-prepared sample exhibited outstanding cyclic performance,with 81.9%retention after 500 cycles within 2.5–4.15 V,and 75.7%retention after300 cycles within 2.5–4.25 V.Meanwhile,it demonstrates enhanced Na^(+)transport kinetics during desodiation/sodiation and reduced growth of charge transfer impedance(R_(ct))after various cycles.Furthermore,the sample showed superb stability against water,exhibiting no discernible degradation in structure,morphology,or electrochemical performance.This co-doping strategy provides new insights for innovative and prospective cathode materials.

关 键 词：Sodium ion batteries P3-type materials Phase transition Na^(+)/vacancy ordering Water-stable cathode 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.541[理学—物理化学]