采用固相法在不同的煅烧温度下（725~825℃）合成了高镍无钴LiNi_0.90Mn_0.10O₂正极材料，并通过结构表征和电化学测试考察了煅烧温度对正极材料的结构和电化学性能的影响。结果表明，煅烧温度会改变材料的晶胞参数，在最佳煅烧温度775℃时所制得的正极材料Li⁺/Ni²⁺混排程度最低；该煅烧温度制备的样品首次放电比容量最高，同时倍率性能也表现最佳，并且在循环200圈后仍然保持着最高的放电比容量。

Ni-rich Co-free LiNi_0.90Mn_0.10O₂ cathode materials are synthesized via the solid-phase method at different calcination temperature (725-825℃), and the effects of calcination temperature on the structural and electrochemical properties of the cathode materials are investigated through structural characterization and electrochemical tests.It is shown from the results that the calcination temperature changes the cell parameters of the material, and the cathode material with the lowest Li⁺/Ni²⁺ mixing is produced at the optimum calcination temperature of 775℃.Electrochemical data show that the sample produced at 775℃ has the highest first-discharge specific capacity as well as the best rate performance, and still maintains the highest discharge specific capacity after 200 cycles.

谢尚辰(1998-),男,硕士研究生,研究方向为锂离子电池正极材料,xieshangchen@stu.csust.edu.cn