Electrochemical cell including electrolyte containing bis(oxalate)borate salt
View Patent ↗An electrochemical cell includes a cathode containing an aluminum current collector, a positive lead coupled to the cathode current collector an anode, and an electrolyte including from greater than 0.075 M to less than 0.2 M of a bis(oxalate)borate salt and a second lithium salt. The positive lead may include a metal selected from aluminum, titanium, and steel. The anode may include lithium, graphite, and a lithiated metal oxide. The aluminum current collector has an aluminum surface having at least one dimension greater than 1 millimeter.
1. 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 a material selected from the group consisting of lithium, graphite, and a lithiated metal oxide; and
an electrolyte containing (1) from greater than 0.075 M to less than 0.2 M of a bis(oxalato)borate salt selected from the group consisting of metal bis(oxalate)borate salts and ammonium bis(oxalato)borate salts, and (2) a second salt comprising a lithium salt, and wherein the aluminum current collector has an aluminum surface having at least one dimension greater than 1 millimeter.
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 second salt is lithium trifluoromethanesulfonate.
4. The electrochemical cell of claim 1 , wherein the positive lead comprises steel.
5. An electrochemical cell comprising:
a cathode containing a current collector comprising a first aluminum alloy;
a positive lead comprising a second aluminum alloy different from the first aluminum alloy coupled to the current collector;
an anode comprising a material selected from the group consisting of lithium, graphite, and a lithiated metal oxide; and
an electrolyte containing from greater than 0.075 M to less than 0.2 M of a bis(oxalato)borate salt and a second salt comprising a lithium salt; and wherein the cathode current collector has an aluminum surface having at least one dimension greater than 1 millimeter.
6. The electrochemical cell of claim 5 , wherein the bis(oxalato)borate salt is lithium bis(oxalato)borate.
7. The electrochemical cell of claim 5 , wherein the electrolyte further contains lithium trifluoromethanesulfonate.