Improved Initial Charging Capacity of Na-poor Na0.44MnO2 via Chemical Presodiation Strategy for Low-cost Sodium-ion Batteries  

作　　者：ZHOU Xi LAI Yangyang WU Xiangjiang CHEN Zhongxue ZHONG Faping Al Xinping YANG Hanxi CAO Yuliang 

机构地区：[1]Engineering Research Center of Organosilicon Compounds and Materials of Ministry of Education,College of Chemistry and Molecular Sciences,Wuhan University,Wuhan,430072,P.R.China [2]Key Laboratory of Hydraulic Machinery Transients,Ministry of Education,School of Power and Mechanical Engineering,Wuhan University,Wuhan,430072,P.R.China [3]National Engineering Research Center of Advanced Energy Storage Materials,Hunan,410205,P.R.China

出　　处：《Chemical Research in Chinese Universities》2021年第2期274-279,共6页高等学校化学研究（英文版）

基　　金：This work was support by the Regional Innovation and Development Joint Fund,China(No.U20A20249);the National Natural Science Foundation of China(No.21972108);the National Key Research Program of China(No.2016YFB0100200).

摘　　要：Sodium-ion batteries(SIBs)are promising for grid-scale energy storage applications due to the natural abundance and low cost of sodium.Among various Na insertion cathode materials,Na0.44MnO2 has attracted the most attention because of its cost effectiveness and structural stability.However,the low initial charge capacity for Na-poor Na0.44MnO2 hinders its practical applications.Herein,we developed a facile chemical presodiated method using sodiated biphenly to transform Na-poor Na0.44MnO2 into Na-rich Na0.66MnO2.After presodiation,the initial charge capacity of Na0.44MnO2 is greatly enhanced from 56.5 mA·h/g to 115.7 mA·h/g at 0.1 C(1 C=121 mA/g)and the excellent cycling stability(the capacity retention of 94.1%over 200 cycles at 2 C)is achieved.This presodiation strategy would open a new avenue for promoting the practical applications of Na-poor cathode materials in sodium-ion batteries.

关 键 词：Sodium-ion battery Na0.44MnO2 Chemical presodiation Sodium biphenyl Initial charge capacity 

分 类 号：TM912[电气工程—电力电子与电力传动]