水系钠离子电池Na_(0.44)MnO_(2)正极的制备及性能研究  

Preparation and electrochemical performance of Na_(0.44)MnO_(2) cathode material for aqueous sodium-ion batteries

作　　者：薛晴 李慧 汪慧明 徐丽 陈重学 XUE Qing;LI Hui;WANG Hui-ming;XU Li;CHEN Zhong-xue(State Key Laboratory of Advanced Power Transmission Technology,Global Energy Interconnection Research Institute Co.,Ltd.,Beijing 102209,China;Key Laboratory of Hydraulic Machinery Transients,Ministry of Education,School of Power and Mechanical Engineering,Wuhan University,Wuhan Hubei 430072,China)

机构地区：[1]全球能源互联网研究院有限公司,先进输电技术国家重点实验室,北京102209 [2]武汉大学动力与机械学院水力机械过渡过程教育部重点实验室,湖北武汉430072

出　　处：《电源技术》2021年第2期141-143,148,共4页Chinese Journal of Power Sources

基　　金：国家电网公司出资项目(SGRIDGKJ[2017]-841)。

摘　　要：Na_(0.44)MnO_(2)具有开放的框架和特殊的三维隧道结构,是一类理想的水系钠离子电池正极材料。分别以C_(4)H_(6)MnO_(4)·4 H_(2)O、MnCO_(3)、50%Mn(NO_(3))_(2)溶液为锰源制备了Na_(0.44)MnO_(2)电极材料,并结合X射线衍射、扫描电镜、比表面分析和电化学测试技术研究了Na_(0.44)MnO_(2)的形貌、结构及储钠性能。结果显示:当采用碳酸锰作为锰源时,所得Na_(0.44)MnO_(2)为结晶良好、形貌均一的纳米棒,直径约为200~400 nm,且具有较大的比表面积(1.862 m^(2)/g),这将有助于促进Na+和电子在相界面之间的传递和转移,从而提高Na_(0.44)MnO_(2)的储钠性能。Na_(0.44)MnO_(2)在6 mol/L NaOH水溶液中的放电比容量达到64.4 mAh/g,循环1000次之后容量保持率高达82%。本工作可为Na_(0.44)MnO_(2)正极的规模制备及其在水系钠离子电池中的应用研究提供基础数据。Na_(0.44)MnO_(2)with an open framework and a special three-dimensional tunnel structure,is regarded as an ideal cathode material for aqueous sodium-ion batteries.In this work,Na_(0.44)MnO_(2)cathode materials were prepared from different Mn resources:C_(4)H_(6)MnO_(4)·4 H_(2)O,MnCO_(3)and Mn(NO_(3))_(2).The structure,morphology and sodium storage performance of these Na_(0.44)MnO_(2)were investigated by XRD,SEM,BET and electrochemical measurements.The results show that when MnCO_(3)is used as the Mn sources,the obtained Na_(0.44)MnO_(2)has a high crystallinity and uniform nanorod morphology with diameters of 200-400 nm,it also has a high specific surface area(1.862 m^(2)/g)which may promote the electron and sodium-ions transfer across the interfaces.The Na_(0.44)MnO_(2)electrode delivers a discharge specific capacity of 64.4 mAh/g in 6 mol/L NaOH electrolyte,with capacity retention of 82%after 1000 cycles.This work can provide basic data for the large-scale production of Na_(0.44)MnO_(2)cathode and its application in aqueous sodium-ion batteries.

关 键 词：Na_(0.44)MnO_(2)正极 锰源 水系钠离子电池 储钠性能 反应机理 

分 类 号：TM912.9[电气工程—电力电子与电力传动]