(1. 湖南立方新能源科技有限公司，株州 412007；
2. 深圳振华新材料有限公司，深圳 518102；
3. 东莞新能源有限公司，东莞 523080)
摘 要: 采用前驱体混合烧结法制备60%LiCoO2-40%LiNi0.5Mn0.3Co0.2O2(摩尔分数)复合材料，采用X射线衍射(XRD)和场发射扫描电镜(FESEM)对试样的显微组织和形貌进行表征，采用差热分析(TG-DSC)和过充试验测试该材料的安全性能。结果表明：与物理混合材料相比，复合材料具有很好的层状结构。混合烧结法通过前驱体的烧结使两种材料晶粒产生了融合，而产生晶粒融合的材料既保持了LiCoO2的高体积能量密度(容量为156 mA？h/g、压实密度为4.0 g/cm3)，还改善了材料的导电能力和安全性能。使用该材料制成的1.6 A？h聚合物全电池，不但可以通过1C/12 V过充测试，而且具有优良的循环性能。该复合材料在常温和45 ℃下循环500次，容量保持率仍在85%以上。
关键字: 锂离子电池；正极材料；LiCoO2；混合烧结；电化学性能；过充
（1. Li-Fun Technology Co. Ltd, Zhuzhou 412007, China;
2. Shenzhen Zhenghua E-Chemical Co. Ltd, Shenzhen 518102, China;
3. Amperex Technology Co. Ltd, Dongguan 523080, China）
Abstract:60%LiCoO2-40%LiNi0.5Mn0.3Co0.2O2 (mole fraction) compound material was synthesized by precursor mixed sintering method. The microstructure and morphology of the compound material were characterized by X-ray diffraction (XRD) and field emitted scanning electronic microscopy (FESEM). The safety performance was analyzed by TG-DSC and abuse test. The results show that, compared with physical mixing material, the compound material has a better bonded crystalline and mixing effect, resulting in improved conductivity and structural stability. The material has high capacity (156 mA？h/g), high pressing density (4.0 g/cm3) and improved safety. 1.6 A？h polymer cells with compound material not only show excellent cycle life at room temperature and elevated temperature, the capacity retention is more than 85% after 500 cycle, but also exhibit good overcharge performance.
Key words: lithium ion battery; cathode material; LiCoO2; mixed sintering; electrochemical properties; overcharge
