期刊
JOURNAL OF POWER SOURCES
卷 518, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230739
关键词
Sulfide solid electrolyte; Lithium sulfide; Cycling performance; Dendrite-free
资金
- School Research Startup Expenses of Harbin Institute of Technology (Shenzhen) [DD29100027]
- State Key Laboratory of Advanced Welding and Joining, School of Materials Science and Engineering, Harbin Institute of Technology [HX20200170]
- National Natural Science Foundation of China [52002094]
- China Postdoctoral Science Foundation [2019M661276, 2021T140150]
- High Power Technology Co., Ltd. [HX20210141]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110756]
- Open Fund of the Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials [AESM202107]
Sulfide-based solid electrolytes with high ionic conductivity and wide electrochemical window are a research hotspot for all-solid-state lithium batteries. However, the interface problem between the sulfide electrolyte and lithium metal remains a challenge. In this study, coating the Li2S layer on the surface of the sulfide solid electrolyte successfully improved the stability of lithium metal batteries.
With the advantages of high ionic conductivity and wide electrochemical window, sulfide-based solid electrolyte becomes a current research hotspot of all-solid-state lithium batteries. Nevertheless, severe interfacial problem between the sulfide electrolyte and lithium metal remains a great challenge, which can render a high interfacial resistance and hinder the transfer of lithium ions through interface, ultimately degrading the cycling performance. Furthermore, lithium dendrites easily form inside the electrolyte, thus accelerating the dendrite-induced shorting behavior of the battery. In this work, Li2S layer is in-situ coated on the surface of the sulfide solid electrolyte Li7P3S11 for highly stable lithium metal battery. The Li2S layer can effectively prevent Li7P3S11 from reacting with lithium metal. Meanwhile, the incorporation of the lithium sulfide can inhibit the generation and growth of internal lithium dendrites, thereby improving the cycling stability. The all-solid-state batteries based on the new designed electrolyte exhibit remarkably enhanced cycling stability. This work provides a simple and effective strategy to suppress lithium dendrite and promotes the practical application of sulfide-based all-solidstate batteries.
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