储能科学与技术2026，Vol.15Issue(8)：2963-2974,12.DOI:10.19799/j.cnki.2095-4239.2026.0313
热处理提升Li7P3S11固态电解质的空气稳定性和电化学性能
Investigation on the effect of thermal treatment on the air stability and electrochemical performance of Li7P3S11 solid electrolyte
摘要
Abstract
All-solid-state lithium batteries(ASSLBs)are considered promising candidates for next-generation electric vehicle power sources owing to their high energy density,superior safety,and long cycle life.However,the poor chemical and electrochemical stability of sulfide-based solid electrolytes in ambient air severely hampers their large-scale application.In this study,we successfully synthesized Li7P3S11 solid electrolyte with a room-temperature ionic conductivity exceeding 1.0 mS/cm via a mechanochemical method.The effects of moisture exposure in air on its performance,as well as the subsequent influence of thermal treatment on its structure and ionic conductivity,were systematically investigated.It was found that air exposure reduces the crystallinity of Li7P3S11 and partially decomposes it into impurity phases,leading to a marked decrease in ionic conductivity.The thermally treated(270℃)Li7P3S11 was then incorporated into ASSLBs paired with a high-nickel layered cathode material(LiNi0.9Mn0.05Co0.05O2)and a Li-In alloy anode,using both a single-layer electrolyte structure and a bilayer configuration that included Li3InCl6.The results showed that both configurations achieved stable cycling for over 200 cycles,with the single-layer structure exhibiting higher specific capacity and better cycling stability.Electrochemical impedance spectroscopy revealed that the inferior performance of the bilayer structure was mainly attributed to increased interfacial resistance between Li7P3S11 and Li3InCl6 after air exposure.This work offers important experimental insights and design strategies for enhancing the practical performance of sulfide-based ASSLBs.关键词
固态锂电池/固态电解质/硫化物/界面稳定性/电化学性能Key words
solid state lithium batteries/solid state electrolyte/sulfide/interface stability/electrochemical performance分类
信息技术与安全科学引用本文复制引用
余乐,李谦,周永宁..热处理提升Li7P3S11固态电解质的空气稳定性和电化学性能[J].储能科学与技术,2026,15(8):2963-2974,12.基金项目
国家自然科学基金项目(52571241). （52571241）
