Cathodes comprising electroactive sulfur materials and secondary batteries using same
AssigneeMoltech Corporation
InventorsAlexander Gorkovenko, Terje A. Skotheim, Zhe-Sheng Xu
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Abstract
The present invention pertains to solid composite cathodes which comprise (a) an electroactive sulfur-containing cathode material which, in its oxidized state, comprises a polysulfide moiety of the formula, —Sm—, wherein m is an integer from 3 to 10; and (b) a non-electroactive particulate material having a strong adsorption of soluble polysulfides. The present invention also pertains to electric current producing cells comprising such solid composite cathodes, and methods of making such solid composite cathodes and electric current producing cells.
Claims18
A solid cathode for use in an electric current producing cell, the cathode comprising:
- (a) an electroactive sulfur-containing material;
- (b) a non-electroactive particulate non-fibrous material having an adsorption of at least 40% of lithium octasulfide in a 0.03 M solution of lithium octasulfide in tetraglyme with the particulate non-fibrous material present at a weight ratio of the particulate non-fibrous material to lithium octasulfide of 6.2 to 1, and wherein the particulate non-fibrous material comprises a carbon.
An electric current producing cell comprising:
- (a) an anode comprising lithium;
- (b) a solid cathode comprising:
- (i) an electroactive sulfur-containing material;
- and
- (ii) a non-electroactive particulate non-fibrous material having an adsorption of at least 40% of lithium octasulfide in a 0.03 M solution of lithium octasulfide in tetraglyme with the particulate non-fibrous material present at a weight ratio of the particulate non-fibrous material to lithium octasulfide of 6.2 to 1, and wherein the particulate non-fibrous material comprises a carbon;
- and
- (c) an electrolyte interposed between the anode and the cathode.
Dependencies are inferred from the claim text.