Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 49, Pages 54711-54719Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c16204
Keywords
quasi-solid state electrolyte; polymer electrolyte; Mg(TFSI)(2); stability; Mg ion battery
Funding
- National Natural Science Foundation of China [21801048, 21905058]
- Ministry of Education [IRT13R30]
- 111 Project [B12015]
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Magnesium ion batteries (MIBs) have attracted a lot of attention because of the natural abundance of magnesium, high volumetric energy density, and superior safety. Nevertheless, MIBs are still in their infancy because of the significant challenge in developing a suitable electrolyte with low flammability, high ionic conductivity, and compatibility with the Mg anode. Herein, we construct rechargeable quasi-solid-state MIBs based on tailored polymer electrolytes. The quasi-solid state electrolyte of poly(vinylidene fluoride-co-hexafluoropropylene)-nanosized SiO2-Mg-(TFSI)(2) combines the outstanding dynamic property of a liquid electrolyte and the good stability of a solid-state electrolyte. It exhibits a highly reversible Mg2+ deposition-dissolution capability, high ion conductivity (0.83 mS cm(-1)), and superior compatibility with the Mg metal and cathode. The quasi-solid-state MIBs with a layered titanic oxide cathode show a high reversible capacity of 129 mA h g(-1) at 50 mA g(-1) (150 W h kg(-1)) without any decay after 100 cycles.
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