球形钛酸镍的制备及其电化学性能表征

Preparation and electrochemical performances ofspherical NiTiO_(3) particles

钛酸镍(NiTiO_(3))是一种新型锂离子电池负极材料,采用溶胶-沉淀法可制备尺寸均匀、表面粗糙的球形NiTiO_(3)颗粒。将制备的球形NiTiO_(3)作为锂离子电池负极材料,具有良好的电化学性能,在0.1 C(50 mA/g)时,其初始充电比容量约为375.6 mAh/g,库仑效率为52.1%;第二次充电比容量为331.3 mAh/g,库仑效率为90.9%;在1 C时,其初始充电比容量为295.4 mAh/g,经过前十次电池活化,循环20~100次的容量基本没有衰减,容量保持率高达99.7%。将球形NiTiO_(3)与片状石墨复合,可提高首次库仑效率,改善循环性能,增加电子导电率,减小电池极化,有利于NiTiO_(3)锂离子电池负极材料的工业应用。

Nickel-titanium oxide(NiTiO_(3))as a novel anode material for rechargeable lithium ion batteries can be prepared using a simple sol-precipitation method followed by annealing.The synthesized NiTiO_(3) consisted of uniform spherical particles with rough surface and the particles were then tested for LiBs applications,and the NiTiO_(3) electrode demonstrated a good electrochemical performance.At an applied special current density of 0.1 C(50 mA/g),the initial charging specific capacity was about 375.6 mAh/g and the coulomb efficiency was 52.1%.The second charging capacity was 331.3 mAh/g and the coulomb efficiency was 90.9%.At a current density of 1.0 C,after the first 10 cycles of battery activation,the capacity from 20 cycles to 100 cycles was constant and corresponded to a capacity retention rate as high as 99.7%.By preparing flake graphite/NiTiO_(3) composite material,the initial coulomb efficiency,the cycling performance,and the electronic conductivity of NiTiO_(3) was improved,and alleviate the battery polarization during the charging and discharging process.The results of this study are beneficial for the industrial application of NiTiO_(3) in energy storage.