Metal-Ion Battery with Offset Potential Material

摘要

A metal-ion battery includes an anode assembly and a cathode assembly ionically coupled by an electrolyte. The anode assembly includes a current collector and an anode material capable of intercalation of metal-ions. When the battery is at rest, ionic transfer between the anode and cathode at a minimum and the anode assembly potential with respect to the electrolyte may increase. The increased potential may exceed the reduction potential of the current collector material causing ions to erode from the current collector and contaminate the cathode. The use of a metal, metal alloy or metal compound reduces the rest potential and erosion of the current collector. For example, a lithium foil physically in contact with a copper current collector in a lithium-ion battery reduces the overall anode potential thereby reducing copper dissolution.

主权项

1. A metal-ion battery comprising:
an anode assembly immersed in an electrolyte and including
a current collector having a first and second side,an anode material, having a first rest potential in reference to the electrolyte, in contact with and sandwiched between the first side and a separator, andan offset potential material, having a second rest potential in reference to the electrolyte, in contact with the second side, wherein the second rest potential reduces a resultant potential of the anode assembly to reduce dissolution of the current collector.