Non-aqueous lithium electrical cell
View Patent ↗An electrochemical cell includes a cathode containing MnO 2 and an anode including lithium. The cell also includes an electrolyte containing a bis(oxalato)borate salt. The cell further includes an aluminum surface in electrical contact with a non-aluminum metal surface.
1. A primary electrochemical cell comprising:
a cathode containing MnO2;
a cathode current collector comprising aluminum coupled to a positive lead including a metal selected from the group consisting of aluminum, titanium, and steel;
an anode containing lithium; and
an electrolyte containing a bis(oxalato)borate salt selected from the group consisting of metal bis(oxalato)borate salts and ammonium bis(oxalato)borate salts at a concentration of from 0.005 M to 0.1 M.
2. The electrochemical cell of claim 1 , wherein the bis(oxalato)borate salt is lithium-bis(oxalato)borate.
3. The electrochemical cell of claim 1 , wherein the electrolyte contains a second salt.
4. The electrochemical cell of claim 3 , wherein the second salt comprises a lithium salt.
5. The electrochemical cell of claim 1 , wherein the cathode lead comprises steel.
6. The electrochemical cell of claim 1 , wherein the electrolyte contains the bis(oxalato)borate salt at a concentration of from 0.005 M to 0.05 M.
7. The electrochemical cell of claim 1 , wherein the cathode current collector has an aluminum surface having at least one dimension greater than 0.5 millimeter.
8. The electrochemical cell of claim 1 , wherein the aluminum surface has at least one dimension greater than one millimeter.
9. The electrochemical cell of claim 1 , wherein the aluminum surface has at least one dimension greater than two millimeters.
10. An electrochemical cell comprising:
a cathode containing an aluminum current collector;
a positive lead including a metal selected from the group consisting of aluminum, titanium, and steel coupled to the aluminum current collector;
an anode comprising lithium; and
an electrolyte containing a bis(oxalato)borate salt selected from the group consisting of metal bis(oxalato)borate salts and ammonium bis(oxalato)borate salts at a concentration of from 0.005 M to 0.1 M and a second salt comprising a lithium salt, wherein the cell is a primary electrochemical cell.
11. The electrochemical cell of claim 10 , wherein the bis(oxalato)borate salt is lithium-bis(oxalato)borate.
12. The electrochemical cell of claim 10 , wherein the cathode contains MnO 2 .
13. The electrochemical cell of claim 10 , wherein the electrolyte contains the bis(oxalato)borate salt at a concentration of from 0.005 M to 0.05 M.
14. The electrochemical cell of claim 10 , wherein the second salt comprises lithium trifluoromethanesulfonate.
15. The electrochemical cell of claim 10 , wherein the electrolyte further comprises a third salt comprising a lithium salt.
16. The electrochemical cell of claim 15 , wherein the third salt comprises lithium trifluoromethanesulfonate or lithium trifluoromethanesulfonimide.
17. The electrochemical cell of claim 10 , wherein the cathode contains iron disulfide.
18. A primary electrochemical cell comprising:
a cathode containing only MnO2 as an active cathode material and an aluminum current collector;
a positive lead including a metal selected from the group consisting of aluminum, titanium, and steel coupled to the aluminum current collector;
an anode containing lithium; and
an electrolyte containing a bis(oxalato)borate salt selected from the group consisting of metal bis(oxalato)borate salts and ammonium bis(oxalato)borate salts at a concentration of from 0.005M to 0.1 M.
19. The electrochemical cell of claim 18 , wherein the bis(oxalato)borate salt is lithium-bis(oxalato)borate.