Structure and electrochemical properties of Zn and Co dual-doped (Li_2Co_(1-x)Zn_xMn_3O_8) as cathode material for rechargeable lithium-ion batteries

摘要

Spinel Zn doped Li_2CoMn_3O_8 (or also known as LiCo_(0.5)Mn_(1.5)O_4) yielding formula Li_2Co_(1-x)Zn_xMn_3O_8 (0 ≤ x ≤ 1) were produced via conventional solid state method. XRD results and the variation of cell lattice and volume showed that the solid solution limit of these compositions was at x=0.6. Impurities were detected when the amount of Zn was beyond 60 %. The discharge capacities deteriorate as Zn content was increased. However, these Zn doped samples exhibited excellent cycle-ability (99.9% capacity retention) throughout 50 charging and discharging cycles which indicated that doping of Zn could possibly stabilised the spinel structure.