MoP纳米粒子锂离子电池负极材料的制备及其电化学性能

用直流电弧等离子体法制备金属钼纳米粉体再使其与赤磷发生固相反应，用两步法制备出磷化钼纳米粒子。使用X射线衍射(XRD)和透射电镜(TEM)等手段表征磷化钼纳米粒子的结构并进行了电化学性能测试。结果表明，MoP纳米粒子呈球状，粒径为20~50 nm；在电流密度为100 mA/g的条件下MoP纳米粒子负极材料的首次放电比容量达到746 mAh/g，50次循环后放电比容量为241.9 mAh/g；电流密度为2000 mA/g时放电比容量为99.90 mAh/g，电流密度恢复到100 mA/g其放电比容量仍然保持247.60 mAh/g。用作锂离子电池的负极材料，MoP纳米粒子具有优异的稳定性和可逆性。

Preparation and Electrochemical Behavior of MoP Nanoparticles as Anode Material for Lithium-ion Batteries

Molybdenum phosphide (MoP) is successfully prepared by a facile 2-step process. First as precursor, nano metal Mo-powders were prepared via DC arc plasma method, which then react with red phosphorus through solid-phase reaction to yield MoP nanoparticles. The prepared MoP nanoparticles were further characterized by means of XRD and TEM. Results show that the MoP nanoparticles are spherical with particle diameter of 20-50 nm. As the anode material for lithium-ion batteries, MoP nanoparticles deliver the initial discharge capacity of 746 mAh/g at the current density of 100 mA/g and the capacity maintains at 241.9 mAh/g after 50 charge-discharge cycles. As the current density increased to 2000 mA/g the discharge capacity decreases to 99.90 mAh/g. The constant capacity of 247.60 mAh/g can be restored when the current density is back to 100 mA/g.