无机全固态锂离子电池界面性能研究进展

Research Progress on Interface Properties of Inorganic Solid State Lithium Ion Batteries

固体电解质不存在易燃等安全问题,发展固态锂电池技术是解决液体电解质锂电池安全问题的根本途径.随着社会对大体积锂离子电池需求的增长以及人们对电池的安全性关注度的日益提高,发展固态锂离子电池已迫在眉睫.制备性能良好的全固态锂电池的关键在于获得高室温离子导电率的固体电解质以及在电极与电解质之间形成良好的接触面.大量的研究集中在制备高室温导电率的固体电解质,目前已经制备出能与液体电解质相媲美的高室温导电率的固体电解质,但固态锂电池的高倍率性能仍然较差,原因是在电极与固体电解质的界面处具有较高的阻抗.关于固态锂电池电极与电解质界面的研究文章相对较少.本文简要介绍了一些具有高室温导电率的氧化物及硫化物电解质,着重分析了全固态锂电池电极与电解质界面处具有高阻抗的原因以及减少界面阻抗的界面改性方法.

The development of solid-state lithium offers a fundamental solution to safety concerns of liquid electrolyte for lithium battery, because of the non-flammability of solid electrolyte. With society＇s increasing demand for large size lithium ion batteries and a growing concern about the safety of batteries, the development of solid lithium battery is imminent. To prepare solid lithium battery with excellent performance, we should obtain solid electrolyte with high ambient temperature ion conductivity and make a good contact between electrode and solid electrolyte. Most studies have been focus on the prep- aration of solid electrolyte with high ambient temperature ion conductivity. Although the conductivity of recently discovered solid electrolyte are comparable with those observed for liquid electrolytes. The high-rate capability of solid-state lithium batteries is still poor. This fact tell us that the rate-controlling step is at the interface between the electrode and the electrolyte materials. Only a few researchers have studied the interface between the electrode and the electrolyte materials. This paper introduces some oxide and sulfide electrolyte with high ambient temperature ion conductivity briefly. We mainly analyze the reasons for the high impedance at the interface between electrode and solid electrolyte, and furthermore, we investigate the modification methods to reduce the interface resistance.