Electrolytes having improved low temperature performance
OwnerJeremy Barker, Feng Gao +1inventors
InventorsJeremy Barker, Feng Gao, Arnold Stux
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Abstract
The present invention provides a novel electrolyte solvent which is usable with a variety of carbonaceous and metal oxide electrode active materials, providing improved performance over a broad temperature range, and which is stabilized to maintain cell capacity over a number of cycles.
Claims15
An electrochemical cell which comprises a first electrode, a counter electrode which forms an electrochemical couple with said first electrode, and an electrolyte;
- said first electrode comprising particles of carbonaceous intercalation active material;
- and said electrolyte comprising a solvent mixture and a solute;
- said solvent mixture comprising ethylene carbonate (EC), propylene carbonate (PC), and a compound represented by R′COOR″, where R′ and R″ are each independently selected from the group consisting of ethyl and propyl.
A lithium ion electrochemical cell which comprises a first electrode, a counter electrode which forms an electrochemical couple with said first electrode, and an electrolyte;
- each of said electrodes having an intercalation active material, with at least one said active material being a carbonaceous active material;
- and said electrolyte comprising a solvent mixture and a solute;
- said solvent mixture consisting essentially of ethylene carbonate (EC), a compound represented by R′COOR″, where R′ and R″ are each independently selected from the group consisting of ethyl and propyl, and dimethyl carbonate (DMC).
Dependencies are inferred from the claim text.