A Ca-substituted air-stable layered oxide cathode material with facilitated phase transitions for high-performance Na-ion batteries  

作　　者：Shu-Bing Wei Yong-Ju He Yan Tang Hong-Wei Fu Jiang Zhou Shu-Quan Liang Xin-Xin Cao 

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China [3]Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province,Central South University,Changsha 410083,China [4]School of Physics and Electronics,Hunan University,Changsha 410082,China

出　　处：《Rare Metals》2024年第11期5701-5711,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51932011,52002407,52172263 and 52272260);the Natural Science Foundation of Hunan Province(Nos.2023JJ10060,2021JJ40730 and 2022JJ30051);the Science and Technology Innovation Program of Hunan Province(No.2022RC1078);the Scientific Research Fund of Hunan Provincial Education Department(No.23A0003)。

摘　　要：Cost-efficient and high-performance cathodes play a crucial role in the advancement of grid-sc ale sodium-ion batteries(SIBs).As promising high-capacity cathode materials for SIBs,O_(3)-type Na-based layered transition metal oxides constantly experience inadequate air stability and complex phase transitions.Herein,a comprehensive investigation was conducted to explore the impact of Ca substitution on both the electrochemical performance and structural stability of O_(3)-Na_(1-2x)Ca_xNi_(0.25)Fe_(0.5)Mn_(0.25)O_(2)(x=0.0.02 and 0.05)that is proposed.With proper Ca content,O_(3)-type Na_(0.96)Ca_(0.02)-Ni_(0.25)Fe_(0.5)Mn_(0.25)O_(2)can deliver a reversible capacity of122.1 mAh·g^(-1)at 10 mA·g^(-1),with capacity retention of83.4%after 200 cycles at 50 mA·g^(-1)and good rate capability.Its air sensitivity is investigated,and its potential as the Na host in full cells has been studied.In situ X-ray diffraction reveals the facilitated O_(3)-P_(3)-O_(3)phase transitions of such cathode during the whole electrochemical reaction.Such a simple and effective strategy may reveal a new avenue for high-stable O_(3)-type cathodes and promote the practical applications of SIBs.

关 键 词：Sodium-ion batteries O_(3)-type layered oxides Calcium-substitution Air-stable 

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]