Patent Number: 6,165,644

Title: Methods and reagents for enhancing the cycling efficiency of lithium polymer batteries

Abstract: Batteries including a lithium electrode and a sulfur counter electrode that demonstrate improved cycling efficiencies are described. In one embodiment, an electrochemical cell having a lithium electrode and a sulfur electrode including at least one of elemental sulfur, lithium sulfide, and a lithium polysulfide is provided. The lithium electrode includes a surface coating that is effective to increase the cycling efficiency of said electrochemical cell. In a more particular embodiment, the lithium electrode is in an electrolyte solution, and, more particularly, an electrolyte solution including either elemental sulfur, a sulfide, or a polysulfide. In another embodiment, the coating is formed after the lithium electrode is contacted with the electrolyte. In a more particular embodiment, the coating is formed by a reaction between the lithium metal of the lithium electrode and a chemical species present in the electrolyte.

Inventors: Nimon; Yevgeniy S. (Walnut Creek, CA), Chu; May-Ying (Oakland, CA), Visco; Steven J. (Berkeley, CA)

Assignee: PolyPlus Battery Company, Inc.

International Classification: H01M 10/36 (20060101); H01M 10/40 (20060101); H01M 4/62 (20060101); H01M 4/04 (20060101); H01M 4/38 (20060101); H01M 4/02 (20060101); H01M 4/36 (20060101); H01M 4/58 (20060101); H01M 2/16 (20060101); H01M 10/39 (20060101); H01M 10/42 (20060101); H01M 10/44 (20060101); H01M 4/60 (20060101); H01M 6/40 (20060101); H01M 6/16 (20060101); H01M 6/18 (20060101); H01M 004/58 ()

Expiration Date: 12/26/2017