锂离子电池用纳米Co_3O_4材料的电化学性能研究

STUDY ON ELECTROCHEMICAL PERFORMANCE OF Co_3O_4 COMPOSITE ANODE FOR LITHIUM ION BATTERIES

采用sol-gel法制备了纳米级Co3O4材料,并用SEM表征了由此材料制备的电极的形貌.对材料进行了恒流充放电测试,并通过充放电曲线研究了材料的容量和倍率性能.结果表明,制备的钴氧化物的颗粒尺寸在20 nm左右,材料的可逆容量和电化学循环稳定性较目前商业化的碳材料有较为明显的提高,材料在1 C倍率下的首次可逆容量为964 mAh/g,第60次循环的可逆容量仍可达到786 mAh/g.

Co3O4 was prepared by sol-gel method.The morphology of the Co3O4 composite was analyzed with scanning electron microscope(SEM).Their charge-discharge performance using the composite as negative electrodes in Li-ion batteries was tested and the electrochemical reaction of the composite was also studied by charge-discharge curves.The results show that the particle size of the Co3O4 is about 20 nm,and the initial reversible capacity and cycle performance of the Co3O4 have been improved significantly in comparison with the commercialized carbon materials.The charge-discharge test results show that Co3O4 exhibits an initial reversible capacity of 964 mAh/g at 1C and remains 786 mAh/g.