Enhanced Air Stability and High Li-Ion Conductivity of Li6.988P2.994Nb0.2S10.934O0.6 Glass-Ceramic Electrolyte for All-Solid-State Lithium-Sulfur Batteries

被引：0
|
作者：
Ahmad, Niaz [1 ]
Zhou, Lei [1 ]
Faheem, Muhammad [1 ]
Tufail, Muhammad Khurram [1 ]
Yang, Le [1 ]
Chen, Renjie [2 ]
Zhou, Yaodan [1 ]
Yang, Wen [1 ]
机构：
[1] Key Lab. of Cluster Sci. of Min. of Educ. Beijing Key Lab. of Photoelectronic/Electrophotonic Conversion Mat., School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 5# Zhongguancun Road, Haidian District, Beijing,100081, China
[2] School of Material Science and Engineering, Beijing Institute of Technology, Beijing,100081, China
来源：
ACS Applied Materials and Interfaces | 2020年 / 12卷 / 19期
关键词：
The development of novel sulfide solid-state electrolytes with high Li-ion conductivity; excellent air-stability; and a stable electrode-electrolyte interface is needed for the commercialization of all-solid-state cells. Currently; an ideal solid electrolyte; which can integrate the solid-state batteries; has not been developed. Herein; the Nb and O codoping strategy is excogitated to improve the chemical and electrochemical performance of sulfide electrolytes. The interactive effect of Nb and O in the novel Li6.988P2.994Nb0.2S10.934O0.6 glass-ceramic electrolyte results in a superior Li+ conductivity of 2.82 mS cm-1 and remarkable air-stability and electrochemical stability against the Li metal compared to the Li7P3S11 counterpart at 25 °C. Solid-state 31P MAS-NMR revealed that doping of LiNbO3 (0 ≤ x ≤ 1) not only enhances the degree of crystallization but also produces P2OS64- units with bridging oxygen atoms in the Li6.988P2.994Nb0.2S10.934O0.6 glass-ceramic electrolyte and hence boosts the conductive deportment of glass-ceramics. Impressively; the developed electrolyte exhibits a stable full voltage window of up to 5 V versus Li/Li+. Furthermore; electrochemical impedance spectroscopy analysis shows that the interface resistance of the Li2S/Li6.988P2.994Nb0.2S10.934O0.6/Li-In cell is lower than that of the cell with Li7P3S11 electrolyte. Besides; the battery of the Li6.988P2.994Nb0.2S10.934O0.6 electrolyte delivers initial discharge capacities of 472.7 and 530.9 mAh g-1 after 50 cycles with 98.88% capacity retention from the second cycle. The Coulombic efficiency of the cell remains at ∼100% after 50 cycles. Thus; the proposed codoped strategy produced a sulfide electrolyte; which addressed the challenging issues of chemical/electrochemical stabilities and showed promising industrial prospects for next-generation all-solid-state batteries. Copyright © 2020 American Chemical Society;
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页码：21548 / 21558
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