掺杂锌对正极材料LiCoVO_4热性能和结构的影响

Improving Thermal Stability of Anode Material LiCoVO_4 with Zn Dopant

采用柠檬酸溶胶-凝胶法首次合成了锌掺杂正极材料L iCo1-xZnxVO4,通过采用DSC-TG及XRD分析对L iCo1-xZnxVO4的热性能和结构进行了表征。结果表明:柠檬酸溶胶-凝胶法在450℃低温下的烧结产物即为单相高结晶的L iCoVO4。锌掺杂后干凝胶前驱体L iCo1-xZnxVO4的热行为发生改变,随锌掺杂量的增加其热分解温度提高。当锌掺杂量x≤0.4时,L iCo1-xZnxVO4呈反尖晶石型结构。当x>0.4时开始出现杂峰,产物结构不再单一。

Purpose. LiCoVO4 looks promising as a good anode material in battery. Before it can be confidently employed in commercial battery, its thermal stability needs to be dependable. Suitable amount of zinc dopant appears to be able to ensure dependable thermal stability. The Zn-doped anode material LiCoVO4 was synthesized for the first time with the citric acid sol-gel method. We investigated the influence of the variation of ＂x＂ on the structure and thermal prosperties of the materials LiCo1-xZnxVO4. The characterization of the thermal properties and structure of LiCo1-xZnxVO4 by means of DSC,TG and XRD, shown in Figs. 2 through 5 in the full paper, shows that the homogeneous high crystalline LiCoVO4 is the product sintered at 450℃ low temperature with the citric acid sol-gel method. After the Zn doping, the thermal behavior of the anode material LiCo1-xZnxVO4 is changed and the thermal stability increases with increasing Zn dopant. When the Zn doping quantity x≤0.4, LiCo1-xZnxVO4 features an inverse spinel structure. When x〉0.4, the stray peaks begin to appear and the structure of the product is no longer singular.