锂离子蓄电池正极材料LiNi_(0.8-x)Co_(0.2)Y_xO_2的制备及性能

Synthesis and properties of LiNi_(0.8-x)Co_(0.2)Y_xO_2 cathode materials for lithium-ion batteries

采用溶胶凝胶法制备了锂离子蓄电池正极材料LiNi0.8-xCo0.2YxO2(x=0.00,0.03,0.04,0.05)。分别用X射线衍射光谱法(XRD)、充放电实验、交流阻抗等测试方法研究了稀土元素钇的掺入对LiNi0.8Co0.2O2结构及电化学性能的影响。结果表明钇的掺入减少了材料中阳离子的混排,稳定了LiNi0.8Co0.2O2的层状结构,提高了首次充放电效率和循环性能,抑制了循环过程中电池阻抗的增加。

Prospective positive-electrode （cathode） materials for lithium secondary battery, viz., LiNi0.8-xCo0.2YxO2 （x 0.00, 0.03, 0.04, and 0.05） were synthesized by sol-gel method. Experiments of XRD, charge-discharge and EIS were carried out. The results show that Y-doped materials have lower degree of cation mixing and better layered structure, the first charge efficiency and capacity retention are improved and the increasing of charge transfer impedance of cathode during cycling is restrained.