锂金属电池用复合固体电解质及其界面研究进展

Research Progress of Composite Solid Electrolytes and Their Interface for Lithium Metal Batteries

相比于液态锂电池,固态锂金属电池由于电解质不易燃、不挥发而具有更高的安全性。此外,固态电解质能够有效抑制锂枝晶的生长,使基于高能量密度的锂金属作为负极材料成为可能。但是,固态锂金属电池存在着界面阻抗大、固体电解质/电极兼容性差、电解质离子电导率低及电化学窗口较窄等问题。因此,开发高性能的柔性固体电解质对推动固态锂金属电池的发展起着重要作用。本工作总结了固态锂金属电池中聚合物与不同类型填料复合最新研究进展及复合固体电解质匹配电极材料时存在的界面阻抗大问题与解决策略。

Solid state lithium metal batteries have extremely high safety,due to the non-flammable and non-volatile characteristics,which makes it possible to use high energy density lithium metal as negative electrode.However,there are still several challenges in the industrialization of solid state lithium metal batteries,such as high interface impedance,poor solid electrolyte/electrode compatibility,low electrolyte ionic conductivity and narrow electrochemical window.Therefore,the development of flexible solid electrolytes with high performance has become an important research topic,in terms of accelerating the development of solid state lithium metal batteries.Here,the latest research progress of composite solid electrolytes in solid state lithium metal batteries and the interface problems and solutions of composite solid electrolyte matching electrode materials will be comprehensively described.