Journal
JOURNAL OF POWER SOURCES
Volume 464, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228182
Keywords
Solid-state battery; Perovskite Li conductor; Ionic conductivity; Nonflammable composite polymer membrane
Funding
- National Natural Science Foundation of China [51702125]
- Pearl River S&T Nova Program of Guangzhou [201806010054]
- Hong Kong Innovation and Technology Fund [ITS/292/18FP]
- Research Grants Council of Hong Kong [16207615, 16227016, 16204517]
- Guangzhou Science and Technology Program [201807010074]
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Solid-state Li-metal batteries are promising as next-generation energy storage devices. However, the main bottlenecks are the poor conductivity of the solid electrolyte and the high interfacial resistance. While polymers exhibit a lower interfacial resistance in comparison to ceramics, they often require the inclusion of flammable solvents. In this work, highly conductive composite polymer electrolyte (CPE) membranes are prepared by integrating a poly(vinylidene fluoride) matrix (PVDF) with a Li-conductive perovskite (i.e., Li0.38Sr0.44Ta0.70H-f(0.30)O(2.95)F(0.05), LSTHF), a flame-retarding solvent (i.e., trimethyl phosphate (TMP)), and a Li salt (i.e., LiClO4). The CPE membrane with 10 wt% LSTHF (CPE-10) exhibits conductivities as high as 0.53 mS cm(-1) at room temperature (RT) and 0.36 mS cm(-1) at 0 degrees C. Furthermore, prototype batteries, including the CPE-10 electrolyte, show high initial discharge capacities, good rate capabilities, and stable cycling performance at either RT or 5 and 60 degrees C. This study illustrates that including a Li-conductive perovskite and TMP in a PVDF-based polymer material could yield safe, high-performance quasi-solid-state Li-metal batteries capable of operating over a relatively wide temperature range.
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