Electrolytes for lithium sulfur cells
First Claim
Patent Images
1. An electrochemical cell compnsing:
- (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, and sulfones;
(ii) one or more lithium salts; and
(iii) one or more N—
O additives, wherein the one or more N—
O additives comprises an inorganic nitrite selected from one or more of the group consisting of lithium nitrite, potassium nitrite, cesium nitrite, and ammonium nitrite.
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Abstract
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.
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Citations
45 Claims
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1. An electrochemical cell compnsing:
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(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, and sulfones; (ii) one or more lithium salts; and (iii) one or more N—
O additives, wherein the one or more N—
O additives comprises an inorganic nitrite selected from one or more of the group consisting of lithium nitrite, potassium nitrite, cesium nitrite, and ammonium nitrite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An electrochemical cell comprising:
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(a) a cathode comprising an electroactive sulfur-containing material; (b) an anode comprising lithium; and (c) a nonagueous electrolyte, wherein the electrolyte comprises; (i) one or more nonagueous solvents selected from the group consisting of acyclic ethers, cyclic ethers, polyethers, and sulfones; (ii) one or more lithium salts; and (iii) one or more N—
O additives;wherein the one or more lithium salts consist of LiSCN and LiN(CF3SO2)2 and the N—
O additive comprises lithium nitrate.
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27. An electrochemical cell comprising:
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(a) a cathode comprising an electroactive sulfur-containing material; (b) an anode comprising lithium; and (c) a nonagueous electrolyte, wherein the electrolyte comprises; (i) one or more nonagueous solvents selected from the group consisting of acyclic ethers, cyclic ethers, polyethers, 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 lithium nitrate. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. An electrochemical cell comprising:
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(a) a cathode comprising an electroactive sulfur-containing material; (b) an anode comprising lithium; and (c) a nonagueous electrolyte, wherein the electrolyte comprises; (i) one or more nonagueous solvents selected from the group consisting of acyclic ethers, cyclic ethers, polyethers, and sulfones; and (ii) one or more N—
O additives, wherein the one or more N—
O additives comprises an inorganic nitrite selected from one or more of the group consisting of lithium nitrite, potassium nitrite, cesium nitrite, and ammonium nitrite. - View Dependent Claims (40, 41, 42, 43, 44, 45)
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Specification