Chemistry: electrical current producing apparatus – product – and – Fluid active material or two-fluid electrolyte combination... – Active material in solution
Patent
1997-10-10
2000-02-29
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Fluid active material or two-fluid electrolyte combination...
Active material in solution
429325, 429328, 429329, 429337, 429339, H01M 1040
Patent
active
06030720&
ABSTRACT:
Disclosed are electrolyte solvents for ambient-temperature lithium-sulfur batteries. The disclosed solvents include at least one ethoxy repeating unit compound of the general formula R.sub.1 (CH.sub.2 CH.sub.2 O).sub.n R.sub.2, where n ranges between 2 and 10 and R.sub.1 and R.sub.2 are different or identical alkyl or alkoxy groups (including substituted alkyl or alkoxy groups). Alternatively, R.sub.1 and R.sub.2 may together with (CH.sub.2 CH.sub.2 O).sub.n form a closed ring. Examples of linear solvents include the glymes (CH.sub.3 O(CH.sub.2 CH.sub.2).sub.n CH.sub.3). Some electrolyte solvents include a donor or acceptor solvent in addition to an ethoxy compound as described. Examples of donor solvents include hexamethylphosphoramide, pyridine, N,N-diethylacetamide, N,N-diethylformamide, dimethylsulfoxide, tetramethylurea, N,N-dimethylacetamide, N,N-dimethylformamide, tributylphosphate, trimethylphosphate, N,N,N',N'-tetraethylsulfamide, tetramethylenediamine, tetramethylpropylenediamine, and pentamethyldiethylenetriamine. These assist in solvation of lithium ions. Examples of acceptor solvents include alcohols, glycols, and polyglycols. These assist in solvation of the sulfide and polysulfide anions.
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Chu May-Ying
De Jonghe Lutgard C.
Katz Bruce D.
Visco Steven J.
Kalafut Stephen
PolyPlus Battery Co., Inc.
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