Patent ID: 7625672

Claim:
A primary (non-rechargeable) zinc/air button cell comprising an anode can and a cathode can; an anode material comprising zinc particles, pyrophosphate (P 2 O 7 ) 4− based additive comprising potassium pyrophosphate (K 4 P 2 O 7 ), and aqueous alkaline electrolyte within said anode can; and a cathode within said cathode can; wherein said aqueous alkaline electrolyte comprises potassium hydroxide having a concentration of between 30 and 40 percent by weight therein; wherein the cathode can comprises an open end and opposing closed end and integral side wall therebetween; said cathode can closed end having at least one air hole therethrough and said cathode is in proximity to said air hole; wherein said anode can comprises an open end and opposing closed end and integral side wall therebetween; wherein the open end of the anode can resides within the open end of the cathode can with at least a portion of the cathode can side wall overlapping at least a portion of the anode can side wall with electrically insulating material between said overlapping wall portions.