富锂正极材料的高价态锰源前驱体制备与表征  

Preparation and characterization of high price manganese source precursor for Li-rich cathode materials

作　　者：刘鑫 周飞 毕亚凡 LIU Xin;ZHOU Fei;BI Yafan(School of Chemistry and Environmental Engineering,Wuhan Institute of Technology,Wuhan Hubei 430073,China)

机构地区：[1]武汉工程大学化学与环境工程学院,湖北武汉430073

出　　处：《电源技术》2021年第7期851-853,959,共4页Chinese Journal of Power Sources

摘　　要：利用市售电解二氧化锰经焙烧-歧化处理制备活性二氧化锰,并以处理前后的材料作为高价态锰源前驱体分别制备了富锂正极材料Li_(1.2)Co_(0.26)Mn_(0.54)O_(2)。探索了不同的焙烧温度对后续歧化所得的锰源前驱体材料结构与性能的影响,采用XRD和FESEM对焙烧前后及歧化后的样品进行表征,对所制备正极材料进行了电化学性能测试与分析。结果表明:随着焙烧温度的提高,所制备前驱体中α-MnO_(2)晶型含量及电化学活性不断降低;经600℃焙烧与歧化后的锰源前驱体中α-MnO_(2)晶型含量最高,其晶粒呈纳米尺寸的柱状,比表面积最大,制备的正极材料电化学性能也表现最佳。The active manganese dioxide was prepared by roasting and disproportionation of the marketed electrolytic manganese dioxide,and the Li_(1.2)Co_(0.26)Mn_(0.54)O_(2) was prepared with the material before and after treatment as the high price manganese source precursor.In this paper,the influence of different calcination temperatures on the structure and properties of the manganese source precursor obtained by subsequent disproportionation was explored.XRD and FESEM were used to characterize the samples before and after calcination,and the electrochemical properties of the prepared anode material were tested and analysed.The results show that with the increase of calcination temperature,the content and electrochemical activity of α-MnO_(2) in the prepared precursor decrease;the manganese precursor roasted and disproportionated at 600℃has the highest content of α-MnO_(2) crystal,the grain is columnar with nanometer size and has the largest specific surface area and the best electrochemical performance of the prepared anode material.

关 键 词：二氧化锰 富锂正极材料 电化学性能 锂离子电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]