硫化物固态电解质电化学稳定性研究进展

Advances in Electrochemical Stability of Sulfide Solid-state Electrolyte

锂离子电池固态化在大幅提高安全性的同时可兼具高能量和高功率密度,在电动车、国防等领域具有重大的应用前景。在实现全固态锂电池的3种固态电解质体系中,硫化物固态电解质由于具有最高的离子电导率、较好的机械延展性以及与电极良好的界面接触等优点,成为最具潜力的技术方向。然而其空气稳定性和电化学稳定性较差,尤其是后者直接限制了其在高能量密度全固态锂电池中的应用。通过从实验及理论计算两方面总结归纳了迄今为止关于硫化物固态电解质电化学稳定性的研究进展,并对现有提升硫化物固态电解质电化学稳定性的实验思路和理论结果进行了总结。

Solid-state lithium batteries have attracted recent attention due to their potentially improved safety,higher energy and power density.Among all solid-state electrolytes studied,sulfide becomes the most promising system due to its maximum ionic conductivity,excellent mechanical ductility and good interfacial contact with electrodes.However,the poor air and electrochemical stability restrict its application in high-energy density all-solid-state lithium batteries.In this review,recent research progress on the electrochemical stability of sulfide solid-state electrolyte is summarized based on the perspective of experiments and theoretical calculation.Some methods and theories for improving the electrochemical stability of sulfide solid-state electrolyte are also represented as future guidelines for the benign development.