摘要
采用草酸前驱体法和传统固相法分别合成了钠离子电池正极材料镍锰酸钠(NaNi_(0.5)Mn_(0.5)O_2),并通过XRD,SEM,恒流充放电测试,电化学阻抗图谱(EIS)和循环伏安(CV)等测试方法,考察了两种材料在结构、形貌和电化学性能方面的差异。结果显示,用草酸前驱体法制备的材料为结晶良好的层状结构,无杂相存在,颗粒直径在1μm左右。在0.5C(60 mA·g^(-1))的倍率下,充放电电压范围为2.0~3.8 V时,草酸前驱体法和高温固相法制备的材料首圈放电比容量分别为119.4 mAh·g^(-1)和123.7 mAh·g^(-1),100次循环后,容量保持率分别为58.3%和35.6%。基于工艺上的简单和有效特性,草酸前驱体法很有潜力作为规模制备钠离子电池层状氧化物正极材料的方法。
Cathode material NNaNi0.5Mn0.5O2 for Na-Ion battery was prepared by oxalate precursor method and traditional solid-state method respectively,and the structural profiles and electrochemical performance for the material prepared via the two different route were explored by XRD, SEM, charge- discharge tests, EIS and CV. It was observed that the as-prepared cathode by oxalate precursor method showed typical crystal in layered structure without impurity phase, and its particle size varied around 1 jjim. The reversible capacity of the as-prepared materials by oxalate precursor method and traditional solid-state method were 119. 4 mAh · g^-1 and 123. 7 mAh · g^-1 at 0. 5C within the voltage range of 2. 0- 3.8 V respectively. And the corresponding long-term capacity retention after 100 cycles were 58. 3% and 35. 6%. Based on the simplicity and efficiency of the oxalate precursor based process, it was promising for mass preparation of layered oxides for Na-ion battery cathode materials.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2016年第8期2101-2107,共7页
Journal of Synthetic Crystals
基金
国家自然科学基金(21506141)
山西省青年基金(2015021131)
关键词
钠离子电池
正极材料
草酸前驱体法
固相法
镍锰酸钠
sodium ion battery
cathode material
oxalate precursor method
solid-state method
NaNi0.5Mn0.5O2
