Abstract
Layered LiCo 0.975Ga 0.025O 2 was prepared by a sol–gel method and its structure, electrochemical and thermal properties were compared with those of LiCoO 2 synthesized by the same method. The results showed that gallium doping improved the capacity retention of LiCoO 2 while it lowered the initial discharge capacity. The improvement of capacity retention was prominent when the cycle tests were carried out at higher cut-off voltage and larger current rate. Cyclic voltammetry test indicated that the phase transition of LiCoO 2 was suppressed by gallium doping. XRD of Li x Co 0.975Ga 0.025O 2 indicated that gallium doping brought about fewer changes in the c-axis during charge. Furthermore, the gallium doping also significantly enhanced the chemical diffusivity of Li +, suppressed the Co dissolution, limited the decomposition of electrolyte and improved the thermal stability of LiCoO 2 during cycling.
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