Electrolyte compositions for aqueous electrolyte lithium sulfur batteries
First Claim
1. An aqueous lithium sulfur electrochemical cell comprising:
- an anode structure comprising an electroactive material;
a cathode comprising a solid electron transfer medium;
an aqueous electrolyte comprising at least 10 vol % of a non-aqueous solvent and greater than 10 vol % of water in direct contact with the electron transfer medium; and
active sulfur species in direct contact with the aqueous electrolyte;
wherein the anode electroactive material is isolated from direct contact with the aqueous electrolyte.
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Abstract
Provided are lithium sulfur battery cells that use water as an electrolyte solvent. In various embodiments the water solvent enhances one or more of the following cell attributes: energy density, power density and cycle life. Significant cost reduction can also be realized by using an aqueous electrolyte in combination with a sulfur cathode. For instance, in applications where cost per Watt-Hour (Wh) is paramount, such as grid storage and traction applications, the use of an aqueous electrolyte in combination with inexpensive sulfur as the cathode active material can be a key enabler for the utility and automotive industries, providing a cost effective and compact solution for load leveling, electric vehicles and renewable energy storage.
223 Citations
29 Claims
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1. An aqueous lithium sulfur electrochemical cell comprising:
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an anode structure comprising an electroactive material; a cathode comprising a solid electron transfer medium; an aqueous electrolyte comprising at least 10 vol % of a non-aqueous solvent and greater than 10 vol % of water in direct contact with the electron transfer medium; and active sulfur species in direct contact with the aqueous electrolyte; wherein the anode electroactive material is isolated from direct contact with the aqueous electrolyte. - 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, 26, 27, 28, 29)
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Specification