中文摘要：

通过共沉淀结合高温固相法合成Li1.1Ni0.35Mn0.55O2正极材料,在材料组分不变的情况下,通过改善合成条件,研究材料自身低温放电效率的变化,在此基础上,对其进行掺杂Co改性。采用X射线衍射光谱法（XRD）和扫描电子显微镜法（SEM）表征Li1.1Ni0.35Mn0.55O2正极材料的微观结构和颗粒形貌。通过电化学性能测试表征材料的低温放电效率。结果表明：在烧结温度900℃,保温时间12 h下的材料阳离子排列有序度最好,低温放电效率为52.67%;同时离子掺杂有利于低温性能的改善,掺杂少量Co有利于提高低温放电效率（64.56%）。

英文摘要：

Li1.1Ni0.35Mn0.55O2 was prepared by co-precipitation and high temperature solid state method and optimized through Co doping modification. The discharge efficiency at low-temperature was discussed on the basis of the same component and different synthesis conditions. The micro structure and particle morphology of the materials were investigated by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The discharge efficiencies at low-temperature were tested by electrochemical performance tests. The results show that Li1.1Ni0.35Mn0.55O2 material obtained at 900 ℃ for 12 h has the best cation ordering and exhibits the highest discharge efficiency at low-temperature, 52.67%. The material through Co doping modification shows the discharge efficiency at low-tem- perature is 64.56%, indicating the Co doping modification can improve the low-temperature performance.