Metal organic framework optimized hybrid solid polymer electrolytes with a high lithium-ion transference number and excellent electrochemical stability
SUSTAINABLE ENERGY & FUELS(2022)
Abstract
Solid polymer electrolytes (SPEs) have proved to be good alternatives to liquid electrolytes. However, their application is severely restricted by low ionic conductivity and poor mechanical strength. Here, NH2-MIL-125 metal-organic frameworks (MOFs) are selected as additives to optimize the poly (ethylene oxide) (PEO)-based SPEs. Compared with PEO-LiTFSI electrolyte (PE), the prepared PEO-LiTFSI-10% NH2-MIL-125 MOF electrolyte (PEM10) not only enhanced the ionic conductivity (3.4 x 10(-3) S cm(-1) at 80 degrees C), but improved the stability of the electrochemical window and lithium-ion transference number (t(Li)(+)). The assembled Li/PEM10/LiFePO4 battery exhibited a specific discharge capacity of 162 mA h g(-1) and superior rate capability of up to 1 C. The assembled Li/PEM10/Li battery showed a stable low-potential cycle for 600 hours at a current density of 0.1 mA cm(-2). These results demonstrate that such a novel electrolyte membrane with excellent performance could be considered as a promising MOF-based SPE for all-solid-state batteries.
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Key words
hybrid solid polymer,excellent electrochemical stability,organic framework,lithium-ion
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