Patent ID: 6406814
Filing Date: 2002-06-18
Classification: H01M,Y02E,Y10S,Y10T

Abstract:
A method of forming a solid composite cathode, wherein said method comprises the steps of:(a) dispersing or suspending, in a liquid medium, an electroactive sulfur-containing material which, in its oxidized state, comprises a polysulfide moiety of the formula, â€”Smâ€”, wherein m is an integer equal to or greater than 3, and a non-electroactive particulate non-fibrous material having a strong physical adsorption of soluble polysulfides, wherein the physical adsorption by said particulate non-fibrous material is characterized by physical adsorption of at least 87% of the lithium octasulfide in a 0.03 M solution of lithium octasulfide in tetraglyme with said particulate non-fibrous material present at the weight ratio of said particulate non-fibrous material to lithium octasulfide of 6.2 to 1; (b) casting the mixture formed in step (a) onto a substrate or placing the mixture formed in step (a) into a mold; and (c) removing some or all of the liquid medium from the mixture of step (b) to form said composite cathode.