Aqueous electrolyte with carbonate and batteries using the same
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorsKensuke Takechi, Ruidong Yang
Life of this patent
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Abstract
An electrolyte composition has a fluoroalkylsulfonyl salt and water. The water is present, relative to the fluoroalkylsulfonyl salt, at a molar ratio within a range of 0.1:1 to 10:1, inclusive. This creates a “water-in-salt” in which individual water molecules are surrounded by salt rather than vice versa. Water contained in this environment is electrochemically stabilized relative to a bulk water. The electrolyte also has an organic carbonate present, relative to the fluoroalkylsulfonyl salt, at a molar ratio within a range of 0.1:1 to 50:1, inclusive. It has been discovered that inclusion of the organic carbonate further increases the electrochemical stability of the water within the “in-salt” environment.
Claims20
An electrolyte composition having:
- a lithium fluoroalkylsulfonyl salt;
- an organic carbonate, present at a first molar ratio, relative to the lithium fluoroalkylsulfonyl salt, within a range of 0.1:1 to 50:1, inclusive;
- and
- water, present at a second molar ratio, relative to the lithium fluoroalkylsulfonyl salt, within a range of 0.1:1 to 10:1.
A Li-ion cell comprising:
- an anode;
- a cathode;
- and
- an electrolyte composition placing the anode and the cathode in ionic communication with one another, the electrolyte composition comprising:
- a lithium fluoroalkylsulfonyl salt;
- an organic carbonate, present at a first molar ratio, relative to the lithium fluoroalkylsulfonyl salt, within a range of 0.1:1 to 50:1, inclusive;
- and
- water, present at a second molar ratio, relative to the lithium fluoroalkylsulfonyl salt, within a range of 0.1:1 to 10:1.
Dependencies are inferred from the claim text.