生物质碳源制备锂离子电池正极材料Na2MnPO4F/C及其电化学性能研究

Preparationof cathode material Na2MnPO4F/C for lithium ion batteries by biomass carbon source and its electrochemical properties

本文以甘蔗渣作为生物质碳源制备Na2MnPO4F/C正极材料。通过球磨法及原位热解法制备Na2MnPO4F/C正极材料,利用拉曼光谱对正极材料制备条件进行表征分析,得出Na2MnPO4F/C最佳制备条件为碳源用量15%、煅烧温度600℃。利用XRD、SEM、EDS、电化学测量技术等手段对材料进行表征分析,结果表明,材料结晶性良好,碳材料很好地包覆在Na2MnPO4F聚氟阴离子材料表面,并且不影响材料结构。组装成纽扣电池,进行电化学性能测试。结果表明Na2MnPO4F/C材料电化学性能优于Na2MnPO4F材料,在0.1C下,Na2MnPO4F/C材料首圈放电比容量为8.71 m Ah/g,而Na2MnPO4F材料首圈放电比容量为1.94 m Ah/g,通过原位热解法进行碳包覆能有效的提高材料的电子电导性,增加容量。

In this paper,Na2MnPO4F/C cathode material was prepared from bagasse as a biomass carbon source.The Na2MnPO4F/C cathode material was prepared via ball milling and in situ pyrolysis.The preparation conditions of the cathode material were analyzed by characterization with Raman spectroscopy and the optimum preparation conditions of Na2MnPO4F/C were 15%carbon source and 600°C calcination temperature.The materials were characterized by XRD,SEM,EDS and electrochemical measurement techniques.The results show that the material had good crystallinity,and the carbon material was well coated on the surface of the Na2MnPO4F polyfluorinated anion material,and did not affect the material structure.The battery was assembled into a button cell for electrochemical performance test.The results show that the electrochemical performance of Na2MnPO4F/C material was better than that of Na2MnPO4F material.At 0.1 C,the specific capacity of the first ring of Na2MnPO4F/C material was 8.71 m Ah/g,while that of Na2MnPO4F material was 1.94 m Ah/g.Carbon coating by in-situ pyrolysis could effectively improve the electronic conductivity of the material and increase the capacity.