期刊
JOURNAL OF POWER SOURCES
卷 446, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227365
关键词
Solid-state battery; Composite solid-state electrolyte; Li anode; Li10GeP2S12; PVDF-HFP; Perfluoropolyethers
资金
- Special fund of key technology research and development projects [20180201097GX, 20180201099GX, 20180201096GX]
- Jilin province science and technology department
- Key Subject Construction of Physical Chemistry of Northeast Normal University
- R&D Program of Power Batteries with Low Temperature and High Energy, Science and Technology Bureau of Changchun [19SS013]
- National Key R&D Program of China [2016YFB0100500]
- National Natural Science Foundation of China [21905041]
- Fundamental Research Funds for the Central Universities
- China Postdoctoral Science Foundation
- Natural Science Foundation of the Jilin Province Education department [JJKH20190265KJ]
Sulfide-based composite solid-state electrolyte has been deemed as Holy Grail for unlocking solid-state lithium metal batteries (SSLMBs) with high-energy density, combining the extremely high ionic conductivity of sulfide and machinability of organic polymer. However, this appealing system is hitherto stymied by two hindrances, difficult to synthesize due to the chemical incompatibility of sulfide with moisture and polar solvents, moreover, interfacial instability with lithium (Li) anode inducing severe Li dendrite grown. Herein, by utilizing perfluoropolyethers as bifunctional adjuvant, we initiatively fabricate sulfide-based composite electrolyte, Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/Li10GeP2S12 and assemble SSLMBs. Perfluoropolyethers with low molecular weight facilitate the stable dispersion of Li10GeP2S12 in casting solution, ascribed to their strong electronegativity of C-F bonds. In addition, high molecular weight perfluoropolyethers function as interfacial stabilizer, dramatically improving the interfacial compatibility with Li anode by in-situ forming a LiF-rich solid electrolyte interphase layer. This composite electrolyte exhibits high room temperature ionic conductivity (0.18 mS cm(-1)), outstanding lithium ion transfer number (0.68), good mechanical strength and nonflammability. The solid-state LiFePO4 parallel to Li battery presents superior long-term cycling stability and rate capability. Our study paves a new way for fabricating the sulfide-based composite electrolyte, provides an effective strategy for constructing compatible solid-state electrolytellLi interface.
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