石墨烯/CuO锂离子电池负极材料的研究进展

石墨烯作为一种锂离子电池负极材料表现出优异的电化学性能,但石墨烯在充放电过程中容易团聚,导致其容量衰减特别快。而金属氧化物在充放电过程中体积膨胀大,因此其容量衰减也非常快；另外,金属氧化物的电导率低,导致其倍率性能差。将金属氧化物与石墨烯复合,两者性能互补,石墨烯可提高复合材料的电导率,缓解金属氧化物在充放电过程中的体积效应；金属氧化物可提高复合材料的储锂容量,并能阻止石墨烯在充放电过程中团聚。本文介绍了石墨烯/CuO锂离子电池负极材料的制备方法,分析了石墨烯与氧化铜及其复合材料的储锂机制,展望了石墨烯/CuO锂离子电池负极材料的应用前景,并指出了当前研究中存在的问题。

Advances in Graphene/CuO Composites as Anode Materials for Lithium Ion Batteries

As an anode material for lithium ion batteries, graphene presents amazing electrochemical performance. Nevertheless, graphene is easy to agglomerate during charge-discharge process, which results in a sharp decrease of its capacitance. Metal oxides show large volume swell in charge and discharge process, leading to severe capacitance decay of the metal material. Besides, the low conductivity of metal oxide brings about the poor charge-discharge rate performance of the material. When the metal oxide and graphene are combined to form composite materials, they are mutually complementary in properties. Graphene can improve the electrical conductivity of the composite materials and relieve the volume variation of the metal oxide during charging and discharging. Metal oxide can enlarge the storage capacitance of composite materials and avoids the agglomeration of graphene during charging and discharging. This paper introduces the preparation method of graphene/CuO anode materials, and analyzes the mechanism of the lit-hium storage of each component and the composite materials. The application prospect of graphene/CuO anode materials for lithium ion batteries are proposed and the problems in current research are pointed out as well.