Electrolyte formulations for lithium ion batteries
View Patent ↗Electrolyte solutions including combinations of high dielectric and low viscosity solvents. These solvent combinations provide low temperature performance and high temperature stability in lithium ion battery cells.
1. A lithium ion battery cell with improved low temperature impedance performance, comprising:
a first electrode;
a second electrode comprising lithium titanate; and
an electrolyte solution, the electrolyte solution comprising a high dielectric solvent formulation including sulfolane and optionally propylene carbonate and a low viscosity solvent comprising at least one of methyl butyrate or methyl trimethyl acetate.
2. The battery cell of claim 1 , wherein the low viscosity solvent comprises methyl butyrate.
3. The battery cell of claim 1 , wherein the low viscosity solvent comprises methyl trimethyl acetate.
4. The battery cell of claim 1 wherein the high dielectric solvent formulation comprises a blend of sulfolane and at least one linear carbonate solvent.
5. The battery cell of claim 4 wherein the linear carbonate solvent is ethyl methyl carbonate, dimethyl carbonate, or a combination thereof.
6. The battery cell of claim 1 wherein the electrolyte solution comprises sulfolane and methyl butyrate.
7. The battery cell of claim 1 wherein the electrolyte solution comprises sulfolane and further comprises methyl propionate.
8. The battery cell of claim 1 wherein the electrolyte solution comprises sulfolane and further comprises isobutyl acetate.
9. The battery cell of claim 1 wherein the electrolyte solution comprises sulfolane and methyl trimethyl acetate.
10. The battery cell of claim 1 wherein the electrolyte solution comprises sulfolane and further comprises methyl isovalerate.
11. The battery cell of claim 4 wherein the electrolyte solution comprises methyl butyrate.
12. The battery cell of claim 4 wherein the electrolyte solution comprises diethyl carbonate.