硬币状氧化镍的制备及其电化学性能研究

通过均匀沉淀法,以氨水作为络合剂,制备了β-氢氧化镍,经450℃煅烧处理得到纳米氧化镍,通过充放电测试和循环伏安测试研究了该产物作为锂离子电池负极材料的电化学性能.XRD、IR表明,反应产物为纯相,SEM和TEM表明,产物形貌为硬币状的特殊形貌.在放电电位区间0.01～3.0 V vs Li/Li＋,0.2C倍率下充放电,初始容量1 050 mAh/g,第2次容量损失35.8％,50次循环后,质量比容量为355 mAh/g,硬币状纳米氧化镍其特殊的形貌具有较大的比表面积,增加了电化学活性点,降低了界面反应的极化,从而提高了NiO电极的电化学性能.

Preparation and electrochemical performance of coin-like NiO anode material for Li-ion batteries

Nano-nickel oxide was prepared by homogeneous precipitation method,using ammonia as com- plexing agent,after 450 ℃ calcination. The electrochemical performances of the nickel oxide electrode are evaluated by CV and charge-discharge test,scanning electron microscopy, transmission electron microscopy, fourier transform infrared spectroscopy and X-ray diffraction are utilized to characterize the structure and morphology of the materials. Coin-like nickel oxide in the discharge potential range of 0.01 - 3.0 V vs Li/Li ＋ ,0.2 C rate,the initial capacity obtain 1 050 mAh/g,and the next cycle loss of 35.8% ,and after 50 cycles,the mass ratio of capacity is 355 mAh/g. Coin-like nano-nickel oxide with larger specific surface area, increased the electrochemical activity, and the polarization of interface reaction is reduced, so as to improve the electrochemical performance of NiO electrode.