碳包覆LiNi1/3Co1/3Mn1/3O2正极材料的制备及其性能研究

Preparation and properties of carbon coated LiNi1/3Co1/3Mn1/3O2 cathode materials

因拥有较高的比能量,镍钴锰三元氧化物正极材料被认为是一种极具潜力的正极材料,分别用葡萄糖和石墨烯分散液作为碳源将碳层包覆在三元正极材料表面;采用扫描电子显微镜法(SEM)和X射线衍射光谱法(XRD)分别对产物的微观形貌和晶体结构进行了测试,并将材料制作成扣式电池进行电化学性能测试和阻抗测试。结果表明,使用石墨烯分散液作为碳源制备的样品具有更好的倍率性能,2C放电比容量提高了10.2mAh/g,其阻抗也小于未包覆的正极材料。

Nickel cobalt manganese ternary oxide cathode material with high energy density was regarded as a potential cathode material. The glucose and graphene dispersion was used as carbon source on the ternary cathode material surface to make carbon coated materials. XRD and SEM were used to characterize the crystal structure and morphology of the products. A half battery was produced by using the material for electrochemical performance test and impedance test. The results show that the sample prepared by using graphene dispersion solution as the carbon source presented better ratio performance. Its 2C discharge capacity increased by 10.2 mAh/g, and the impedance is smaller than that of the positive material without carbon coating.