铜箔上制备CoSb_3纳米颗粒薄膜在锂离子电池电极中的应用

锂离子电池性能研究和提高已成为化学电源领域热点,使用低压化学气相沉积(LPCVD)法在铜箔上制备CoSb_3纳米颗粒薄膜,该薄膜不添加任何粘合剂,直接用作锂离子电池电极。50次充放电测试数据表明:使用CoSb_3纳米颗粒薄膜的电极充放电性能良好,电荷存储容量较高;初始放电容量为378.8 mA·h/g,在初始充电过程中测试得到充入电容量为205.2 mA·h/g、库仑效率为54.1%;在第二个充放电周期获得了低了些的放电容量为222.6 mA·h/g和相应的充电容量205.2 mA·h/g,库仑效率为92.2%,从第二个循环周期开始锂离子电池已经有较高的充放电效率;在50个充放电周期后CoSb_3纳米薄膜的电容量下降到55.4 mA·h/g。在CoSb_3纳米薄膜的充放电周期中如此重大的电容量损失是归因于在锂化过程中产生了大型结构变化。

Application of CoSb_3 Nanoparticles Film on Copper Foil for Lithium-ion Battery Electrode

The research of the improvement of lithium ion battery performance had become a research focus in the field of chemical power.CoSb3 nanoparticles film on copper foil had been prepared via low pressure chemical vapor deposition(LPCVD).The film was used directly as lithium ion battery electrode without any ancillary materials.The test data after 50 charging and discharging cycles test show:the CoSb3 nanoparticles film using as battery electrode depict stable charge-discharge performance and high charge storage capacities;an initial discharge capacity is 378.8 mA·h/g;a capacity of 205.2 mA·h/g is observed during the initial charging process,and a Coulombic efficiency of 54.1%is obtained;a lower discharge capacity of 222.6 mA·h/g and a corresponding charge capacity of 205.2 mA·h/g is obtained in the second cycle,leading to a Coulombic efficiency of 92.2%,which shows that the lithium ion battery has a higher charge and discharge efficiency from second cycles.The capacity of CoSb3 nanoparticles film decrease to 55.4 mA·h/g after 50 cycles.The significant capacity loss during the cycling of CoSb3 nanoparticles film is ascribed to the large structural change generated during the lithiation process.