石墨烯纳米片-氧化亚钴负极材料制备与表征

Synthesis and characterization of graphene nanosheets-cobalt oxide composites as anode material

采用水热法结合500℃高温焙烧制备了新型高性能锂离子电池负极材料石墨烯纳米片-氧化亚钴(GNS-CoO)复合材料。采用XRD及TEM等手段对石墨烯纳米片-氧化亚钴复合材料结构和形貌进行表征,并对其电化学性能进行测试。结果表明,石墨烯纳米片-氧化亚钴复合材料的循环性能明显优于氧化亚钴,以200mA/g进行充放电得到首次放电比容量为1040.2mAh/g,50次循环后放电比容量为1027.8mAh/g,显示出良好的循环稳定性。

A graphene nanosheets-CoO（GNS-CoO） composite as a high performance anode material for lithium-ion battery was firstly prepared by a hydrothermal method and then calcined at 500 ℃.The structure,morphology and electrochemical performance of the obtained samples were systematically investigated by X-ray diffraction（XRD）,transmission electron microscope（TEM） and electrochemical measurements.The test results show that cycle performance of GNS-CoO is obviously better than cobalt oxide;the specific discharge capacity of GNS-CoO attains to 1 040.2 mAh/g in the first cycle at a current density of 200 mA/g;after 50 cycles,the reversible specific capacity of GNS-CoO can still reach about 1 027.8 mAh/g.