期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 9, 页码 4066-4072出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm15345a
关键词
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资金
- King Abdullah University of Science and Technology (KAUST) [KUS-C1-018-02]
- National Science Foundation [DMR-1006323]
- Cornell Center for Materials Research (CCMR), National Science Foundation [DMR-1120296]
- Division Of Materials Research [1006323] Funding Source: National Science Foundation
We investigate physical and electrochemical properties of a family of organic-inorganic hybrid electrolytes based on the ionic liquid 1-methyl-3-propylimidazolium bis(trifluoromethanesulfone) imide covalently tethered to silica nanoparticles (SiO2-IL-TFSI). The ionic conductivity exhibits a pronounced maximum versus LiTFSI composition, and in mixtures containing 13.4 wt% LiTFSI, the room-temperature ionic conductivity is enhanced by over 3 orders of magnitude relative to either of the mixture components, without compromising lithium transference number. The SiO2-IL-TFSI/LiTFSI hybrid electrolytes are thermally stable up to 400 degrees C and exhibit tunable mechanical properties and attractive (4.25V) electrochemical stability in the presence of metallic lithium. We explain these observations in terms of ionic coupling between counterion species in the mobile and immobile (particle-tethered) phases of the electrolytes.
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