期刊
ACS APPLIED ENERGY MATERIALS
卷 5, 期 6, 页码 7317-7327出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c00831
关键词
lithium-metal batteries; gel polymer electrolyte; PVDF-HFP/PMMA; spherical ZrO2 particles; interface compatibility
资金
- National Natural Science Foundation of China [U19A2018]
- Key Project of Strategic New Industry of Hunan Province [2019GK2032]
- Postgraduate Scientific Research Innovation Project of Hunan Province [CX20210637]
- Xiangtan University Innovation Foundation for Postgraduate [CX2021B150]
The safety issue of lithium batteries based on liquid electrolytes has attracted attention. Researchers have designed a gel polymer electrolyte (GPE) that enhances the ionic conductivity, flexibility, and safety of batteries. The GPE exhibits excellent tensile strength, interface compatibility, and cyclic stability, making it a promising material for high-performance lithium batteries.
The safety issue of lithium batteries based on liquid electrolytes has become the focus of attention, especially when the batteries are exposed to mechanical, thermal, or electrical abuse conditions. To address this issue, gel polymer electrolytes (GPEs) have attracted widespread interest due to the property of solid-liquid coexistence with higher ionic conductivity, flexibility, and safety. In this work, a poly(vinylidene-fluoride-co-hexafluoropropylene) (PVDF-HFP)/poly-(methyl methacrylate) (PMMA) matrix GPE, containing bis(trifluoromethane)-sulfonimide lithium salt (LiTFSI) and spherical zirconium dioxide (ZrO2) nanoparticles, is successfully designed and synthesized by a simple one-step solution-casting route. It has been found that the obtained PVDF-HFP/PMMA-ZrO2-6% (PPZ-6%) electrolyte film possesses an excellent tensile strength of 37.7 MPa. Moreover, the PPZ-6% GPE not only has a high ionic conductivity of 1.46 x 10(-3) S cm(-1) at 25 degrees C but also presents excellent interface compatibility in an Li parallel to Li symmetrical battery. The LiFePO4 parallel to Li cell assembled with the PPZ-6% GPE exhibits good cyclic stability at room temperature, e.g., a high discharge specific capacity of 153.0 mAh g(-1), and a high Coulombic efficiency of 99% after 200 cycles at 0.5 C. Therefore, this organic-inorganic hybrid GPE modified with spherical ZrO2 nanoparticles reveals a good application prospect for high-performance lithium metal batteries (LMBs).
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