Halide as Catholyte in Composite Cathode to Enhance Cycling Stability of All-Solid-State Lithium-Sulfur Batteries

被引：0

作者：

Fang, Xiaorong ^{[1
]}

Fu, Yujun ^{[1
]}

Sun, Shiqing ^{[1
]}

Zhang, Rongcheng ^{[1
]}

Guo, Pengqian ^{[2
]}

Sun, Kai ^{[1
]}

Liu, Dequan ^{[1
]}

Wang, Kai ^{[1
]}

He, Deyan ^{[1
]}

机构：

[1] Lanzhou Univ, Sch Mat & Energy, Lanzhou 730000, Peoples R China

[2] Huaqiao Univ, Sch Informat Sci & Engn, Xiamen 361000, Peoples R China

来源：

NANO LETTERS | 2025年

基金：

中国国家自然科学基金;

关键词：

halide catholyte; cycling stability; iodine; all-solid-state; lithium-sulfur batteries; ARGYRODITE LI6PS5CL; CRYSTAL; REDOX;

D O I：

暂无

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

All-solid-state lithium-sulfur batteries (ASSLSBs) using inorganic solid-state electrolytes can effectively alleviate the polysulfide shuttle effect in liquid electrolytes and improve the energy density. However, the electrochemical window of sulfide-based catholytes in composite cathodes is relatively narrow, which makes the evaluation of electrochemical performance of sulfur cathodes in ASSLSBs complicated. The decomposition of the sulfide catholytes increases the interfacial resistance, thus reducing the battery cycle life. To overcome these challenges, Li3YCl5I has been developed with a wide window of electrochemical stability for a catholyte suitable for a composite cathode. Its ionic conductivity is as high as 1.67 x 10-3 S cm-1, which is conducive to the rapid transport of lithium ions. The ASSLSB based on the Li3YCl5I catholyte exhibits a discharge specific capacity of 1084.05 mAh g-1 at 45 degrees C. Additionally, it maintains 81.5% capacity after 100 cycles, significantly exceeding the retention rate of 54.5% for a battery using Li6PS5Cl.

引用

页数：8