全固态锂离子电池硫化物电解质的研究进展

Research Progress on Sulfide Electrolyte for All-Solid-State Lithium Batteries

目前,锂离子电池已经广泛地应用于交通、通讯、便携式电子产品及电动工具等领域。传统的锂离子电池采用液体电解液,存在易挥发、易泄漏、抗冲击性能差等缺点,存在安全隐患。全固态电解质具有热稳定性高、循环寿命长、抗震动性能好等优点,是锂离子电池取代液体电解液的一种理想替代方案。硫化物电解质体系具有离子导电率高、制备简便、电化学窗口宽等优点,已经成为全固态锂离子电池的研究热点。综述了全固态锂电池Li2S-P2S5基电解质的最新研究进展,总结了各种性能改进方法,并对其应用前景做了展望。

Recently, lithium-ion batteries have been widely used in the field of transportation, communication, portable electronics and electric tools, etc. Traditional lithium ion batteries pose a lot of safety hazards by using liquid electrolyte, such as volatility, easy to leak, poor impact resistance, etc. All-sol- id-state electrolyte, which has the property of high thermal stability, long cycle life, shock resistant per- formance, is an ideal alternative material to replace the liquid electrolyte. The sulfide electrolyte with many advantages, including high ionic conductivity, simple preparation, wide electrochemical window, has become a research focus of all-solid-state lithium ion batteries recently. The progress of Li2S-P2S5 based electrolytes of all-solid-state lithium-ion battery is introduced in this paper. The latest research re- suits and various improvements of battery performance are summarized, and the prospect of application for the sulfide electrolyte in the future is also discussed.