Li2S-P2S5体系电解质及其在全固态锂离子电池中的应用研究进展

Research Progress of Li2S-P2S5 Electrolytes and Their Application in Solid-State Lithium-Ion Batteries

全固态锂离子电池具有安全性能好、能量密度高、工作温区广等优点,被广泛应用于便携式电子设备。固态电解质是全固态锂离子电池的关键材料之一,其中的硫化物电解质具有离子电导率高、电化学窗口宽、晶界电阻低和易成膜等特点,被认为最有希望应用于全固态锂离子电池。本文综述了Li2S-P2S5体系电解质的发展状况,包括固态电解质的制备、改性、表征以及电极/固态电解质之间的固-固界面的稳定兼容问题。本文还涉及了以Li2S-P2S5为电解质的全固态锂离子电池性能的研究进展。

All-solid-state lithium-ion batteries have been widely used in portable electronic devices due to their advantages of good safety performance, high energy density, wide working-temperature range, etc. The solid electrolytes are the key material of all-solid-state lithium-ion batteries. Among various electrolytes,the sulfide-based materials have the characteristics of high ionic conductivity,wide electrochemical window,low grain boundary resistance and easy film formation,and is considered to be the most promising electrolyte in all-solid-state batteries.In this paper, we focused on the recent progress in the solid electrolytes with respect to the preparation,characterization and modification of Li_2S-P_2S_5 electrolytes,and stability/compatibility of the interface between the solid electrolyte and the electrode. Moreover,the performance of these solid electrolyte related all-solid-state lithiumion batteries are also reviewed.