全固态锂电池界面的研究进展

与传统锂离子电池相比，基于无机固体电解质的全固态锂电池，具有安全性能高、循环寿命长、能量密度高等优点，是目前锂电池研究领域的热点之一，未来有望在电动汽车和智能电网等领域得到广泛应用。全固态锂电池中，电极与固体电解质之间的固固接触相比固液接触具有更高的界面接触电阻，同时，界面相容性和稳定性也显著影响全固态锂电池的循环性能和倍率性能。而在固体电解质中，晶界电阻决定了电解质整体的离子电导率，因此，界面问题是决定电池电化学性能的关键所在。本文重点综述了全固态锂电池中各种界面问题的研究现状，主要包括界面调控机理、修饰方法，并指出全固态锂电池中界面调控面临的挑战。

Research progress on interfaces of all solid state lithium batteries

Compared with conventional lithium ion batteries, all solid state lithium batteries based on solid electrolytes are new research hotspots, in view of such potential merits as high safety, long cycle life and high energy density. Furthermore, all solid state lithium batteries could be wildly used on electric vehicles and smart grid in the near future. The solid-solid contact resistance of interfaces between electrodes and solid electrolytes is larger than solid-liquid contact resistance. Meanwhile, interface compatibility and stability have significant influence on cycle performance and rate capability. Moreover, grain boundaries in electrolytes determine overall conductivity. Thus, interface issues have great effect on electrochemical performances of all solid state lithium batteries. This paper presents a brief review on all kinds of interfaces in all solid state lithium batteries, covering interface optimizing mechanism and modification methods. The challenges on interface in all solid state lithium batteries are suggested as well.