Electrolyte solutions for high energy cathode materials and methods for use
Described herein are materials for use in electrolytes that provide a number of desirable characteristics when implemented within batteries, such as high stability during battery cycling up to high temperatures, high voltages, high discharge capacity, high coulombic efficiency, and excellent retention of discharge capacity and coulombic efficiency over several cycles of charging and discharging. In some embodiments, a high voltage electrolyte includes a base electrolyte and a set of additive compounds, which impart these desirable performance characteristics.
1. A battery capable of several cycles of charging and discharging comprising:
an anode;
a cathode; and
a liquid electrolyte comprising a lithium salt, a non-aqueous solvent, and a polymeric additive, wherein the polymeric additive includes poly(bis(4-(ethoxycarbonyl)phenoxy)phosphazene and is soluble in the non-aqueous solvent at 30° C.
2. The battery of claim 1 wherein a concentration of the polymeric additive is no less than 0.2 weight percent and no greater than 10 weight percent of a total weight of the liquid electrolyte.
3. The battery of claim 1 wherein the battery is characterized by a rated charge voltage greater than about 4.2 V.
4. The battery of claim 1 wherein the battery is characterized by a rated charge voltage greater than about 4.5 V.
5. The battery of claim 1 wherein the battery is characterized by a rated charge voltage greater than about 4.7 V.
6. The battery of claim 1 wherein the battery is characterized by a rated charge voltage greater than about 4.9 V.
7. The battery of claim 1 wherein the cathode comprises nickel, manganese, and cobalt.
8. The battery of claim 1 wherein the anode comprises activated carbon.
9. A method of making a high voltage battery capable of several cycles of charging and discharging, comprising:
providing a liquid electrolyte solution comprising a lithium salt, a non-aqueous solvent, and a polymeric additive, wherein the polymeric additive includes poly(methyl vinyl ether-alt-maleic anhydride) and is soluble in the non-aqueous solvent at 30° C.;
providing an anode;
providing a cathode;
assembling the anode and cathode and a separator into an electrochemical cell;
adding the liquid electrolyte solution to the cell; and
sealing the cell to form the high voltage battery.
10. The method of claim 9 wherein the cathode comprises nickel, manganese, and cobalt.
11. The method of claim 9 wherein the anode comprises activated carbon.
12. The battery of claim 1 , wherein the polymeric additive does not increase the viscosity of the liquid electrolyte.
13. A battery capable of several cycles of charging and discharging comprising:
an anode;
a cathode; and
a liquid electrolyte comprising a lithium salt, a non-aqueous solvent, and a polymeric additive, wherein the polymeric additive includes poly(methyl vinyl ether-alt-maleic anhydride) and is soluble in the non-aqueous solvent at 30° C.
14. The battery of claim 13 , wherein a concentration of the polymeric additive is no less than 0.2 weight percent and no greater than 10 weight percent of a total weight of the liquid electrolyte.
15. The battery of claim 13 , wherein the battery is characterized by a rated charge voltage greater than about 4.2 V.
16. The battery of claim 13 , wherein the battery is characterized by a rated charge voltage greater than about 4.5 V.
17. The battery of claim 13 , wherein the battery is characterized by a rated charge voltage greater than about 4.7 V.
18. The battery of claim 13 , wherein the battery is characterized by a rated charge voltage greater than about 4.9 V.
19. The battery of claim 13 , wherein the cathode comprises nickel, manganese, and cobalt.
20. The battery of claim 13 , wherein the anode comprises activated carbon.