Tuning Particle Size of Na0.44MnO2 for Aqueous Na-Ion Battery Cathode
Aqueous sodium-ion battery is a complementary technique to lithium-ion battery because of its comparatively low cost,improved safety,and environmentally friendly electrolyte.However,the lower electrode capacity limits the application of this kind of batteries.Na0.44MnO2 is a high capacity cathode for Na-ion batteries.Its theoretical capacity is 121 mAh/g.In this article,we investigate the size effect of Na0.44MnO2 on cathode performance.The nanorods are prepared by heat treatment of a MnO2 nanoflake precursor,of which the size is tuned by the ratio of CTAB and KMnO4.The Na0.44MnO2 nanorods are then used as the active material of cathode for aqu-eous sodium-ion batteries.The nanorod cathode delivers 60 mAh/g in the initial cycle at 1 C and retains 55 mAh/g after 200 cycles,which is 37.5％higher than Na0.44MnO2 bulk cathode.This cathode gives a high capacity of 47 mAh/g after 200 cycles at a high rate of 5 C.The increased capacity is attributed to diminishing charge transfer resistance and improved Na-ion diffusivity caused by the higher specific surface area of the nanorod.
Na-ion batteryCathodeAqueous electrolyteSize
黄璧成、余灵辉、葛婧捷、徐梽川
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南洋理工大学材料科学与工程学院 新加坡 639798
钠离子电池 正极 水系电解液 尺寸
National Research Foundation,Prime Minister's Office,SingaporeCampus for Research Excellence and Technological Enterprise(CREATE)program
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