期刊
ADVANCED ENERGY MATERIALS
卷 12, 期 37, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202201732
关键词
dry process; novel binders; solvent-free; sulfide all-solid-state batteries; sulfide solid electrolytes; thin membranes
类别
资金
- Key Program-Automobile Joint Fund of the National Natural Science Foundation of China [U1964205]
- Key R&D Project - Department of Science and Technology of Jiangsu Province [BE2020003]
- General Program of National Natural Science Foundation of China [51972334]
- General Program of National Natural Science Foundation of Beijing [2202058]
- Cultivation Project of Leading Innovative Experts in Changzhou City [CQ20210003]
- National Overseas High-level Expert Recruitment Program [E1JF021E11]
- Science and Technology Research Institute of China Three Gorges Corporation [202103402]
- Talent Program of Chinese Academy of Sciences
- Scientist Studio Program Funding from Yangtze River Delta Physics Research Center [TIES-SS0001]
- Tianmu Lake Institute of Advanced Energy Storage Technologies [TIES-SS0001]
Sulfide all-solid-state batteries (ASSBs) are considered as promising next-generation energy storage devices due to their improved safety performance and high energy density. Solvent-free dry-film processes have unique advantages, but the current binder used in these processes, polytetrafluoroethylene, has poor voltage stability and low viscosity. In this study, a specially-designed treatment is developed to obtain a new type of dry binder, styrene-butadiene rubber (SBR), which significantly improves the cycling stability and Coulombic efficiency of sulfide ASSBs.
Sulfide all-solid-state batteries (ASSBs) have been widely acknowledged as next-generation energy-storage devices due to their improved safety performance and potentially high energy density. Among the various fabrication methods of sulfide ASSBs, solvent-free dry-film processes have unique advantages including reduced costs, suppressed film delamination, thick electrodes, and high compatibility with sulfide solid electrolytes (SEs). However, the currently dominating binder for dry-film process polytetrafluoroethylene suffers from poor voltage stability and low viscosity, which leads to low Coulombic efficiency and poor cycling stability of sulfide ASSBs. Herein, a specially-designed treatment is developed to obtain a new type of dry binder, styrene-butadiene rubber (SBR), exploiting paraxylene and a NaCl substrate to dissolve and re-precipitate SBR for controlling its stacking state, micro-structure/morphology, density, and dispersion performance. The SE membrane prepared using this processed SBR exhibits ultra-high ionic conductivity (2.34 mS cm(-1)), contributing to excellent cycle stability of the corresponding sulfide ASSB (>84% capacity retention after 600 cycles at 0.3C).
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