钨掺杂对锂离子电池LiNiO2正极材料性能的影响

Effect of W-Doping on Electrochemical Performance of LiNiO2 Cathode for Lithium-Ion Batteries

采用溶胶-凝胶法制备了钨掺杂镍酸锂正极材料(LiNi1-xWxO2,x=1%、3%),研究了钨掺杂对LiNiO2正极材料电化学性能的影响。结果表明,钨掺杂明显地改善了LiNiO2的充放电循环性能,在100mA·g-1的电流密度和2.5~4.5V电压范围的测试条件下,LiNi0.99W0.01O2材料循环400次后的容量保持率为62.51%,而LiNiO2在相同循环条件下的保持率仅为47.06%。同时,钨掺杂也提升了LiNiO2的充放电倍率性能,掺杂材料在每一个倍率下放电比容量均高于未掺杂材料。

W-doping LiNiO2 (LiNi1-xWxO2, x=1% and 3%) cathode materials were prepared by sol-gel method. The effects of W-doping on electrochemical performances of LiNiO2 materials were studied. The results showed that W-doping significantly improved the cycle performance of LiNiO2 during charge-discharge process. The capacity retention of the LiNi0.99W0.01O2 was 62.51% at a current density of 100 mA·g^-1 after 400 cycles in the voltage of 2.5~4.5 V, while the LiNiO2 was only 47.06%. In addition, the rate performance of LiNiO2 was improved at the same current rates.