椰壳炭作为锂离子电池负极材料的电化学性能研究

Electrochemical Performance of Coconut Shell Carbon as Anode Material for Lithium⁃Ion Batteries

以椰壳为原料,采用高温热解法和活化法制备了椰壳活性炭负极材料。通过X射线衍射、拉曼光谱、扫描电子显微镜、循环伏安法和电化学阻抗谱图等手段考察了活化处理对椰壳炭结构、形貌以及电化学性能的影响。结果表明,经活化处理的椰壳炭无序化程度高,富含微孔、介孔多孔结构,在0.1 A/g电流密度下,首次放电比容量达到918.22 mAh/g,在1 A/g电流密度下循环200次后放电比容量仍有447 mAh/g。

Activated carbon derived from coconut shell was prepared as anode material by adopting high temperature pyrolysis and activation.The effects of activation on the structure,morphology and electrochemical properties of coconut shell carbon were investigated by using X⁃ray diffraction,Raman spectroscopy,scanning electron microscopy,cyclic voltammetry and electrochemical impedance spectroscopy.The results show that the coconut shell carbon after activation process is highly disordered,and also microporous and mesoporous.It delivers an initial discharge specific capacity of 918.22 mAh/g at a current density of 0.1 A/g,and retains a specific capacity of 447 mAh/g after 200 cycles discharge at a current density of 1 A/g.