碳包覆MnSn_2锂离子电池负极材料合成及性能

Preparation and properties of carbon-coated MnSn_2 as anode for lithium ion battery

用球磨-热解法合成了碳包覆锂离子电池锰锡合金负极材料MnSn2/C。通过XRD、TEM和电化学测试对材料进行了表征。制备的材料粒径大小分布在1～2μm之间,合金材料表面完全被碳包覆,碳层厚度约为60～120 nm。在充放电电压为1.5 V到0 V范围内,初始可逆充电比容量为675 mAh/g,经过20周的循环后,充电比容量仍然保持为440mAh/g。与没有碳包覆的MnSn2负极材料相比,其循环性能有较大提高。

Carbon-coated manganese tin alloy,MnSn2/C was synthesized as anode material for lithium ion batteries by ball-milling pyrolysis method.The product was characterized by XRD,TEM and electrochemical measurements.The size of the particles is the range of 1 μm to 2 μm,and carbon coating is complete in alloy material surface with 60-120 nm thickness.The reversible specific capacity of the prepared MnSn2/C is 675 mAh/g in the first cycle and the rest charge specific capacity is 440 mAh/g in the 20th cycle when the cell is discharged and charged between 1.5 V and 0 V.The results show that carbon-coated manganese tin alloy exhibits better electrochemical property than uncoated manganese tin alloy.