Patent ID: 6596439
Filing Date: 2003-07-22
Classification: A61N,H01M,Y02E,Y02P,Y10T

Abstract:
A rechargeable battery comprising:one positive electrode, said positive electrode comprising a metal substrate having one positive active material formed thereon, said positive active material consisting of a lithium oxide comprising cobalt and nickel; a negative electrode comprising a metal substrate selected from the group consisting of titanium and titanium alloy having a second active material comprising carbon formed thereon; an electrolyte wherein said negative electrode and said electrolyte form a solid electrolyte interface (SEI) layer, said SEI layer being susceptible of damage when a voltage potential exceeding a Film Dissolution Potential (FDP) is applied thereto, and wherein said FDP is lower than the maximum positive operating potential of the battery; said positive and negative electrodes defining a Zero Volt Crossing Potential (ZCP) relative to a reference level when the voltage between said electrodes is zero; and wherein said positive and negative electrodes are selected and configured to establish ZCP at a lower level than FDP to prevent dissolution of said SEI layer during storage at a predetermined temperature.