期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 29, 页码 34477-34485出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c10238
关键词
all-solid-state batteries; lithium-sulfur batteries; sulfide electrolyte; solid-state electrolyte; air stability
资金
- Science and Technology Support Plan of Tianjin [19YFZCGX00220]
- National Natural Science Foundation of China [21935006]
- Fundamental Research Funds for the Central Universities, Nankai University [63211043]
Glass-ceramic sulfide solid electrolytes like Li7P3S11 are practical propellants for all-solid-state lithium-sulfur batteries, but stability and conductivity issues persist. Through a congener substitution strategy, Li7P3S1 was optimized to Li7P2.9Sb0.1S10.75 with improved chemical stability and high ionic conductivity. The electrolyte exhibited high discharge capacities, remarkable rate performance, and high Coulombic efficiency in the ASSLSB.
Glass-ceramic sulfide solid electrolytes like Li7P3S11 are practicable propellants for safe and high-performance all-solid-state lithium-sulfur batteries (ASSLSBs); however, the stability and conductivity issues remain unsatisfactory. Herein, we propose a congener substitution strategy to optimize Li7P3S1 as Li7P2.9Sb0.1S10.75 via chemical bond and structure regulation. Specifically, Li7P2.9Sb0.1S10.75O0.25 is obtained by a Sb2O5 dopant to achieve partial Sb/P and O/S substitution. Benefiting from the strengthened oxysulfide structural unit of POS33- and P2OS64- with bridging oxygen atoms and a distorted lattice configuration of the Sb-S tetrahedron, the Li7P2.9Sb10.75O0.25 electrolyte exhibits prominent chemical stability and high ionic conductivity. Besides the improved air stability, the ionic conductivity of Li7P2.9Sb10.75O0.25 could reach 1.61 X 10(-3) S cm(-1) at room temperature with a wide electrochemical window of up to 5 V (vs Li/Li+), as well as good stability against Li and Li-In alloy anodes. Consequently, the ASSLSB with the Li7P2.9Sb10.75O0.25 electrolyte shows high discharge capacities of 1374.4 mAh g(-1) (0.05C, 50th cycle) at room temperature and 1365.4 mAh g(-1) (0.1C, 100th cycle) at 60 degrees C. The battery also presents remarkable rate performance (1158.3 mAh g(-1) at 1C) and high Coulombic efficiency (>99.8%). This work provides a feasible technical route for fabricating ASSLSBs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据