煅烧法制备石墨烯包覆Mn_3O_4纳米复合粉体及其电化学性能研究

Research on Preparation of Graphene Coated Mn_3O_4 Nano-composites by Calcination Method and Its Electrochemical Performance

为了大量、方便地制备电化学性能优异的锂离子电池负极材料,利用一步煅烧法制备石墨烯包覆Mn_3O_4纳米复合粉体,采用X射线衍射、扫描电子显微镜、透射电子显微镜对复合粉体进行表征,并进行电化学性能检测。结果表明:石墨烯把Mn_3O_4颗粒很好地包覆在里面;石墨烯包覆Mn_3O_4纳米复合粉体具有优秀的电化学性能,含碳质量分数为13%的石墨烯包覆Mn_3O_4纳米复合粉体首次放电比容量达到859.7 m A·h/g,电流密度为1 600 m A/g时的放电比容量保持在380 m A·h/g,循环100次后放电比容量几乎保持不变。

To obtain the anode materials with good electrochemical performance for lithium ion batteries liberally and conveniently,the graphene coated Mn_3O_4 nano-composites was prepared by the method of one step calcination. The composites were characterized by XRD,SEM and TEM,and the electrochemical detection was conducted. The results show that the Mn_3O_4 particles are well anchored in the graphene. The graphene coated Mn_3O_4 nano-composites has a good electrochemical performance. The initial discharge capacity of graphene coated Mn_3O_4 nano-composites with carbon mass fraction of 13% reaches 859.7 m A·h/g.The discharge cap acity maintains at 380 m A·h/g even with a high current density of 1 600 m A/g. The materials also display no capacity loss after 100 cycles.