Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
2006-03-14
2006-03-14
Weiner, Laura (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
C429S218100, C429S232000, C252S518100, C252S519130, C423S599000, C423S594700
Reexamination Certificate
active
07011908
ABSTRACT:
The present invention provides a manganese bismuth mixed metal oxide cathode material through a solid-state reaction between manganese dioxide, and either bismuth or a bismuth compound in a compound having the general formula MnOy(Bi2O3)x, which affords charge transfer catalytic behavior that allows the cathode to be fully reversible at suppressed charge potentials and increased discharge potentials. The MnOy(Bi2O3)xcathode material may be incorporated into an electrochemical cell with either a lithium metal or lithium ion anode and an organic electrolyte. The present invention provides a compound with the general formula MnOy(Bi2O3)x, where subscript x is between 0.05 and 0.25, subscript y is about 2 and the overcharge protection is not needed as the subscript z approaches 0.0. In the preferred embodiment, a cathode material where subscript x is between 0.05 and 0.135 with the formula MnO2(Bi2O3)0.12provides the much-needed full reversibility, high voltage stability and reduced charge transfer impedance. A manganese bismuth mixed metal oxide cathode for an lithium electrochemical system, a lithium electrochemical system and a rechargeable lithium battery employing the same compound with the general formula MnOy(Bi2O3)xand methods for making manganese bismuth mixed metal oxide cathode material for lithium electrochemical devices having the general formula MnOy(Bi2O3)xare also provided.
REFERENCES:
Atwater et al. “Thermodynamic and kinetic study of the Li/MnO2 Bi2O3 electrochemical couple”. Journal of the Electrochemical Society, vol. 145, No. 3, Mar. 1998, pp. L31-L33.
Atwater et al. “Electrochemical properties of the Li/MnO2 Bi2O3 couple”, Proceedings of the Power Sources Conference (1998), 38th.
Atwater Terrill B.
Salkind Alvin J.
Suszko Arek
Tereschuk George B.
The United States of America as represented by the Secretary of
Weiner Laura
Zelenka Michael
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