Mechanochemical synthesis of amorphous solid electrolytes in the system Li2O–B2O3–[EMI]BF4
A new type of solid electrolyte was mechanochemically prepared from lithium pyroborate glass as a Li+ ion conductor, and 1-ethyl-3-methyl-imidazolium tetrafluoroborate ([EMI]BF4) as an ionic liquid. It was revealed from FT-IR and 11B MAS-NMR measurements that [EMI]+ cations and BF4 − anions were not decomposed by high energy ball milling, and were still present in the prepared (100–x)(0·67Li2O.0·33B2O3).x[EMI]BF4 (mol%) glasses. DSC analysis suggests that glass transition temperatures were decreased by the addition of [EMI]BF4 to the lithium borate glass. The ambient temperature conductivity of the glass containing 10 mol% [EMI]BF4 was 10–4 S cm–1, which is four orders of magnitude higher than that of 67Li2O.33B2O3 (mol%) glass. The activation energy for conduction was decreased by the addition of [EMI]BFM4. The dissolution of an ionic liquid in glass is a novel way to enhance the conductivity of glass electrolytes.
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Document Type: Research Article
Publication date: August 1, 2009