摘要
通过简单的溶胶凝胶法合成P2型Na_(2/3)Fe_(1/2)Mn_(1/2)O_(2)正极材料并研究煅烧温度对材料结构、形貌和电化学性能的影响。结果表明,在900℃煅烧得到的产物是高结晶度的P2型Na_(2/3)Fe_(1/2)Mn_(1/2)O_(2)化合物且具有六角板状颗粒形貌,颗粒宽度为2~4μm,厚度为200~400 nm。样品以26 mA/g充放电时表现出243 mA·h/g的初始放电比容量和良好的循环性能,其高容量说明P2型Na_(2/3)Fe_(1/2)Mn_(1/2)O_(2)是一种很有应用前景的钠离子电池正极材料。
P2-type Na_(2/3)Fe_(1/2)Mn_(1/2)O_(2) was synthesized by a facile sol−gel method,and the effect of calcination temperature on the structure,morphology and electrochemical performance of samples was investigated.The results show that the sample obtained at 900℃ is pure P2-type Na_(2/3)Fe_(1/2)Mn_(1/2)O_(2) phase with good crystallization,which consists of hexagon plate-shaped particles with the size and thickness of 2−4μm and 200−400 nm,respectively.The sample exhibits an initial specific discharge capacity of 243 mA·h/g at a current density of 26 mA/g with good cycling stability.The high specific capacity indicates that P2-type Na_(2/3)Fe_(1/2)Mn_(1/2)O_(2) is a promising cathode material for sodiumion batteries.
作者
秦牡兰
尹常宇
许稳
刘洋
文俊豪
申斌
王伟刚
刘万民
Mu-lan QIN;Chang-yu YIN;Wen XU;Yang LIU;Jun-hao WEN;Bin SHEN;Wei-gang WANG;Wan-min LIU(Hunan Provincial Key Laboratory of Environmental Catalysis&Waste Recycling,College of Materials and Chemical Engineering,Hunan Institute of Engineering,Xiangtan 411104,China)
基金
the financial supports from the Natural Science Foundation of Hunan Province,China(No.2020JJ5102)
the Scientific Research Fund of Hunan Provincial Education Department,China(No.19A111).
