Overcharge protection of secondary, non-aqueous batteries

Abstract From the Canadian patent

The invention features the use of redox reagents, dissolved in non-aqueous electrolytes to provide, overcharge protection for cells having alkali metal negative electrodes (anodes). In particular the inven-, tion features the use of organometallic compounds known, as metallocenes, as redox shuttle reagents ,to provide overcharqe protection. Specific examples of this invention are bis(cyclopentadienyl)iron known as, ferrocene; bis(n-butyl-cyclopentadienyl)iron known as, butylferrocene; bis(cyclopentadienyl)nickel known as, nickelocene; and bis(cyclopentadienyl)cobalt known as, cobaltocene. An example of a rechargeable battery in which thesa redox reagents are used has an Li negative …