三维网络结构氧化铜纳米线锂离子电池负极材料的制备和性能研究

3D CuO network as anode material for lithium ion battery

通过阳极氧化法和后退火处理在铜箔上合成了三维网络结构氧化铜纳米线,将其作为负极材料制备了无需添加粘结剂的锂离子电池。研究了恒压氧化时间对材料形貌和电化学性能的影响。在1C的倍率下,氧化1000 s制备的CuO纳米线表现出最高的1172 mAh/g首圈放电比容量和594 mAh/g的可逆比容量,500圈循环可逆比容量为607.6 mAh/g,可逆容量保留率为102.3%。交联的三维网络结构CuO纳米线相互支撑,提供稳定的结构,有效缓解了CuO纳米线作为锂离子电池负极材料中的体积膨胀问题,表现出了优异的倍率性能和循环寿命。

Copper oxide nanowires were synthesized on copper foil substrate by anodic oxidation method followed by a simple annealing process.The lithium-ion battery without binder was prepared by using it as anode material.The effect of the anodizing time on the morphology and electrochemical properties of the materials was studied.At the rate of 1 C,the CuO nanowires array with anodizing time of 1000 s showed the highest first discharge specific capacity of 1172 mAh/g and the reversible specific capacity of 594 mAh/g.The reversible specific capacity after 500 circles was 607.6 mAh/g,and the reversible capacity retention rate was 102.3%.It proves that the cross-linked 3D CuO nanowire network could provide a stable structure for lithium ion insertion and removal,which could effectively solve the volume expansion problem of copper oxide materials as anode materials for lithium ion batteries,and exhibit excellent rate performance and cycle life.