石墨烯在固态电池界面改性中的应用

Application of graphene in interface modification of solid state batteries

全固态锂电池具有安全可靠性高、能量密度大、循环寿命长、电化学窗口宽、高温适应性强等优点,制约其实际应用的主要瓶颈在于电极与固态电解质之间的界面问题,包括负极界面区的锂枝晶、体积膨胀,正极界面区的结构变化、空间电荷层、界面反应等。石墨烯因其特殊的二维结构,优良的导电、导热及力学性能而广泛应用于电化学储能领域。综述了石墨烯在电极/固态电解质界面改性方面的研究进展,并对石墨烯在固态电池领域的应用前景进行了展望。

The all-solid-state lithium battery has the advantages of high safety and reliability,high energy density,long cycle life,wide electrochemical window,and good high temperature adaptability.However,the main bottleneck restricting its practical application lies in the interface between the electrode and the solid electrolyte,such as Li dendrites and volume expansion in the anode interface region,as well as structural changes,space charge layer and side reactions in the cathode interface region.Graphene is widely used in the field of electrochemical energy storage due to its special 2D structure,excellent electrical conductivity,thermal conductivity and mechanical properties.In this paper,the authors review the research progress on the modification of electrode/solid electrolyte interface with graphene,and prospect the application of graphene in solid-state batteries.