控制还原法制备高性能MnO@Ni锂离子电池负极材料

发布时间：2018-03-22 15:28

本文选题：锂离子电池　切入点：共沉淀　出处：《硅酸盐学报》2017年07期 　论文类型：期刊论文

【摘要】：以乙酸镍、乙酸锰为原料,碳酸氢钠为沉淀剂,利用共沉淀法制备了镍锰碳酸盐前驱体,并在还原气氛中通过控制还原法制备了具有不同Mn/Ni摩尔比的球形MnO@Ni负极材料,并对其成分、形貌和元素分布及电化学性能进行表征。结果表明:通过在MnO体相中均匀掺入合适比例的高导电性金属镍,可以有效提高锂离子电池负极材料MnO的电化学性能。Mn/Ni摩尔比为1:10时,MnO@Ni负极材料5C放电比容量为214.3 mA·h/g,0.5C循环200次容量保持率为72%,呈现出高的倍率性能和循环保持率。
[Abstract]:Using nickel acetate and manganese acetate as raw materials and sodium bicarbonate as precipitant, the nickel-manganese carbonate precursor was prepared by co-precipitation method. The spherical MnO@Ni anode material with different Mn/Ni molar ratio was prepared by controlled reduction in reducing atmosphere. The composition, morphology, element distribution and electrochemical properties were characterized. The results showed that the proper proportion of high conductivity nickel was added into the bulk phase of MnO. When the molar ratio of mn / Ni is 1:10, the discharge specific capacity of 5C anode material is 214.3 Ma 路g / g ~ (0.5) C cycle, and the capacity retention rate is 72%, showing a high rate of performance and a high cycle retention rate, which can effectively improve the electrochemical performance of the cathode material of Li-ion battery with the molar ratio of mn / Ni at 1:10, and the discharge specific capacity of 5C is 214.3 Ma / g / g ~ (0.5) C cycle.
【作者单位】：合肥工业大学化学与化工学院;
【基金】：国家自然科学基金项目(21271058,91534102) 安徽省科技攻关项目(1501021013)
【分类号】：TM912

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