Non-aqueous electrochemical cells
View Patent ↗Electrochemical cells are disclosed. In some embodiments, an electrochemical cell includes a cathode having less than about 2,000 ppm of water, an anode, and an electrolyte having a first lithium salt and LiPF 6 .
1. A primary electrochemical cell, comprising:
a cathode comprising a cathode active material consisting of manganese oxide and/or iron disulfide, the cathode having less than about 2,000 ppm of water;
a cathode current collector comprising aluminum;
an anode comprising lithium; and
an electrolyte comprising lithium trifluoromethanesulfonate, LiPF 6 , and a third lithium salt selected from the group consisting of LiClO 4 and lithium-bis(oxalate) borate.
2. The cell of claim 1 , wherein the cathode has less than 1,500 ppm of water.
3. The cell of claim 1 , wherein the cathode has less than 1,000 ppm of water.
4. The cell of claim 1 , wherein the cathode has less than 500 ppm of water.
5. The cell of claim 1 , wherein the electrolyte comprises, in mole fraction, from 20% to 80% of lithium trifluoromethanesulfonate and from 20% to 80% of LiPF 6 .
6. The cell of claim 1 , wherein the electrolyte comprises from about 300 to about 10,000 ppm of LiClO 4 .
7. The cell of claim 1 , further comprising an aluminum surface.
8. The cell of claim 1 , wherein the electrolyte further comprises a material selected from the group consisting of ethylene carbonate, propylene carbonate, dimethoxyethane, butylene carbonate, and dioxolane.
9. The cell of claim 1 , wherein the electrolyte further comprises propylene carbonate and dimethoxyethane.
10. The cell of claim 9 , wherein the electrolyte comprises from about 30% to about 90% by weight of dimethoxyethane.
11. The cell of claim 9 , wherein the electrolyte further comprises ethylene carbonate.
12. The cell of claim 11 , wherein the electrolyte comprises, by weight, from about 5% to about 30% of ethylene carbonate, and from about 30% to about 90% dimethoxyethane.
13. The cell of claim 1 , wherein the electrolyte further comprises ethylene carbonate, butylene carbonate, and dimethoxyethane.
14. The cell of claim 13 , wherein the electrolyte comprises, by weight, from about 5% to about 30% of ethylene carbonate, and from about 30% to about 90% of dimethoxyethane.
15. The cell of claim 1 , wherein the electrolyte comprises dioxolane.
16. A method, comprising:
discharging, only once, a primary electrochemical cell comprising
a cathode comprising manganese oxide and/or iron disulfide, the cathode having less than about 2,000 ppm of water,
a cathode current collector comprising aluminum,
an anode comprising lithium, and
an electrolyte comprising lithium trifluoromethanesulfonate, LiPF 6 , and a third lithium salt selected from the group consisting of LiclO 4 and lithium-bis(oxalate) borate; and
disposing the cell without recharging the cell.