烧结温度对LiNi0.8Co0.15Al0.05O2结构和电化学性能的影响

采用共沉淀法+高温固相法，首次在740~820℃制备了一系列LiNi_0.8Co_0.15Al_0.05O₂正极材料，探讨温度变化对材料结构性能的影响.通过X射线分析仪、扫描电镜、电化学工作站、电池充放电测试系统表征材料性能.结果显示在780℃烧结出的材料有纯的六方晶相、层状结构优异，在2.75~4.2 V、0.1 C倍率获得188.11 mAh/g，0.5 C循环100次后容量稳定率为88.55 %，高于其他温度制备的材料; 经过不同倍率放电后，780℃烧结出的材料不可逆容量损失远低于其他温度制备的材料. 

Effect of sintering temperature on the structure and electrochemical properties of LiNi0.8Co0.15Al0.05O2

A series of LiNi_0.8Co_0.15Al_0.05O₂ cathode materials were prepared at 740~820℃ by co-precipitation and high temperature solid phase method. The effect of small temperature changes on the structure and properties of the materials was investigated. The material properties were characterized by X ray analyzer, electrochemical workstation and battery charging and discharging test system. The results show that the material sintered at 780℃ has a pure hexagonal phase and is optimal in layered structure. It achieves 188.11 mAh/g at 2.75~4.2 V and 0.1 C rate. The capacity stability rate is 88.55 % after 0.5 C cycle for 100 times, which is higher than that of other temperature prepared materials. The irreversible capacity loss of materials sintered at 780℃ after different rate discharges is much lower than that of materials prepared at other temperatures.