Co部分取代V对Li_3V_2P_3O_(12)/C电化学性能的影响

Electrochemical performance effect of Co partial substituting V on Li_3V_2P_3O_(12)/ C

分析了Co部分取代V对磷酸钒锂(Li3V2P3O12)正极电化学性能的影响。Co部分取代后结晶结构不变,仍然保持单斜结构,具有P21/n空间群,XRD测试未发现杂质相。Co部分取代会降低0.1 C倍率下材料的放电容量,但是有助于提高0.5 C倍率循环时的放电容量与循环稳定性。

The influence of partial Co-substitution on the electrochemical performance of Li3V2P3O12 cathode was analyzed. After substitution of partial Co by V element, the crystalline structure remained unchanged, and was still a monoclinic structure with a space group of P21/n. No impurity phase was found in XRD test. Partial Co-substitution could decrease discharge capacity of the material at 0. 1 C rate, but was helpful to improve the discharge capacity and cycle stability of 0. 5 C rate cycle.