【摘要】 采用共沉淀法将 Ce⁴⁺ 掺杂到正极材料 LiNi_0.5Mn_1.5O₄ 中改进材料缺陷以平稳提升其电化学性能。Ce⁴⁺ 掺杂进入正极材料表面层的八面体空间点位，不改变 LiNi_0.5Mn_1.5O₄ 材料的结构形态。Ce⁴⁺ 掺杂使晶胞的晶格参数增大，从而扩充 Li⁺ 扩散通道，便于 Li⁺ 在充放电过程中的扩散。通过电化学测试分析掺杂改性后的 LiNi_0.5Mn_1.5-xCe_xO₄ 材料的电化学性能，将测试结果与空白相 LiNi_0.5Mn_1.5O₄ 正极材料的电化学性能进行比较。LiNi_0.5Mn_1.495Ce_0.005O₄ 具有更好的电化学性能，在 1C 放电倍率下首次放电比容量为 126.43 mA·h·g^-1，1C 循环 200 次后的放电比容量为 121.20 mA·h·g^-1，容量保持率高达 95.86 %，在 20C 大倍率放电下放电比容量为 104.10 mA·h·g^-1。更多还原

【Abstract】 Ce⁴⁺ was doped into positive electrode material LiNi_0.5Mn_1.5O₄ by co-precipitation method to improve its electrochemical properties.The doping of Ce⁴⁺ into the octahedral space of the surface layer of the positive electrode material does not change the structure of LiNi_0.5Mn_1.5O₄ material.The doping of Ce⁴⁺ increases the lattice parameters of the cells,thus enlarging the Li⁺ diffusion channel and facilitating the diffusion of Li⁺ during charge and discharge.The electrochemical properties of the doped LiNi_0.5Mn_1.5-xCe_xO₄ were analyzed by electrochemical testing,and the test results were compared with those of the blank phase LiNi_0.5Mn_1.5O₄ cathode material.LiNi_0.5Mn_1.495Ce_0.005O₄ has better electrochemical performance.The specific discharge capacity of LiNi_0.5Mn_1.495Ce_0.005O₄ is 126.43 mA·h·g^-1,121.20 mA·h·g^-1 after 200 cycles at 1C discharge rate,and the capacity retention rate is as high as 95.86 %.The discharge specific capacity is 104.10 mA·h·g^-1 at 20C high rate discharge.更多还原