【作者】 胡进； 李泓； 王兆翔； 黄学杰；

【Author】 Jin Hu, Hong Li, Xuejie Huang(Laboratory for Solid State Ionics, Division on Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing, 100080, China)

【机构】 中国科学院物理研究所凝聚态物理国家实验室纳米物理与器件研究部固态离子学实验室；

【摘要】 硬碳包覆的cr2O3相对于商品Cr2O3而言显示出较好的电化学性能,首次效率提高并且循环性大大改善。这种负极材料的首次放电容量和充电容量分别为1112mAh/g和778mAh/g.在热解过程中,碳与Cr2O3发生反应生成铬的碳化物。硬碳包覆的Cr2O3具有较好的循环性主要是因为它既保持了活性物质良好的电接触,又避免了SEI膜形成分解造成大的体积变化。更多还原

【Abstract】 Hard carbon coated Cr2O3 is investigated as an anode material for lithium ion batteries. It shows better electrochemical performance than that of the bare Cr2O3. The initial discharge and charge capacity of the hard carbon coated Cr2O3 is 1112mAh/g and 778mAh/g. Hard carbon coating Cr2O3 with core/shell structure shows better capacity retention beneficial from two factors: maintaining the electronic contact of active particles during cycling and avoiding the formation of unstable SEI film on Cr2O3. The increased charge capacity in the initial cycles can be attributed to the oxidation of the Cr that origin from the decomposition of the chrome carbide.更多还原