锂离子负极材料NiFe_2O_4/Graphene复合材料的制备和电化学性能  

Preparation and electrochemical properties of NiFe_2O_4/Graphene composites as anode materials for lithium ion batteries

作　　者：杨光[1] 陈野川[1] 薛卫东[1] 赵睿[1] 

机构地区：[1]电子科技大学微电子与固体电子学院电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《化工科技》2014年第5期16-19,共4页Science & Technology in Chemical Industry

摘　　要：通过水热法合成了NiFe2O4/Graphene纳米复合材料,采用XRD和SEM对其晶相结构和形貌进行了表征,并将其作为锂离子电池活性材料组装成模拟电池,考查电化学性能。结果表明NiFe2O4/Graphene复合材料在100mA/g的电流密度下首次放电容量达970mAh/g,循环20次后,容量保持在668mAh/g,相比纯的NiFe2O4,具有较好的循环稳定性,这种优异的电化学性能归因于复合材料的纳米结构和NiFe2O4与Graphene的协同作用。NiFe2O4/Graphene nanocomposites were synthesized via hydrothermal.The crystalline phase and morphology of the sample have been characterized by X-ray（XRD）and scanning electron microscopy（SEM）.The electrochemical performance of NiFe2O4/Graphene as an anode materials for lithium-ion batteries was also investigated.The results indicated that NiFe2O4/Graphene composites showed a high specific capacity of 970mAh/g,retained 668mAh/g at a current density of 100mA/g up to 20 cycle and exhibited good cycle stability than that of pure NiFe2O4.The excellent electrochemical performance is attribute to nanostructures of composites and the synergetic effect between NiFe2O4 and Graphene.

关 键 词：NiFe2O4/Graphene 锂离子电池负极 水热合成 循环性能 

分 类 号：TM911[电气工程—电力电子与电力传动]