Electrolytes for lithium sulfur cells

摘要

Disclosed is an additive for an electrochemical cell wherein the additive includes an N—O bond. The additive is most preferably included in a nonaqueous electrolyte of the cell. Also disclosed are cells and batteries including the additive, and methods of charging the batteries and cells. An electrochemical cell including the additive preferably has an anode that includes lithium and a cathode including an electroactive sulfur-containing material.

主权项

1. An electrochemical cell comprising:
(a) a cathode comprising an electroactive sulfur-containing material; (b) an anode comprising lithium; and (c) a nonaqueous electrolyte, wherein the electrolyte comprises:
(i) one or more nonaqueous solvents selected from the group consisting of acyclic ethers, cyclic ethers, polyethers, cyclic acetals, acyclic acetals and sulfones;(ii) one or more lithium salts; and(iii) one or more N—O additives, wherein the one or more N—O additives is selected from one or more of the groups consisting of nitramines, isonitramines, nitramine salts and isonitramine salts.