Lithium fluoropolymer and fluoro-organic batteries
OwnerRachid Yazami, Qingfang Shiinventors
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Abstract
The invention provides lithium and lithium ion batteries in which the active material of one of the electrodes includes a substantial quantity of a fluoropolymer or fluoro-oligomer material having carbon-fluorine bonds. The fluoropolymer or fluoro-oligomer active material may be mixed with a substantial quantity of electrically conductive material, and may also be mixed with subfluorinated carbonaceous materials. The batteries of the invention are useful for elevated temperature applications. The invention also provides methods for electrochemical generation of energy which employ the batteries of the invention at elevated temperatures.
Claims31
An electrochemical cell comprising
- a. a first electrode comprising a mixture of an electrically conducting material and a fluoropolymer or fluoro-oligomer having carbon-fluorine bonds, wherein the amount of fluoropolymer or fluoro-oligomer is greater than 50 wt % and less than 100 wt % of the mixture, and the electrical conductivity of the mixture is greater than or equal to 1×10−8 S/cm.
- b. a second electrode comprising a source of alkali metal or alkaline earth metal ions;
- and
- c. an electrolyte provided between the first and second electrodes, the electrolyte being ionically conducting, comprising alkali metal cations or alkaline earth metal cations, and being other than a fusible metal salt.
A method of generating electrical energy electrochemically which comprises the steps of:
- a. providing an electrochemical cell comprising a first electrode comprising a mixture of an electrically conducting material and a fluoropolymer or fluoro-oligomer having carbon-fluorine bonds, wherein the amount of fluoropolymer or fluoro-oligomer is greater than 50 wt % and less 100 wt % of the mixture, and the electrical conductivity of the mixture is greater than or equal to 1×10−8 S/cm;
- a second electrode comprising a source of alkali metal or alkaline earth metal ions;
- and
- an electrolyte provided between the first and second electrodes, the electrolyte being ionically conducting, comprising alkali metal cations or alkaline earth metal cations, and being other than a fusible metal salt;
- and
- b. heating the electrochemical cell to a temperature less than the decomposition temperature of the fluoropolymer or fluoro-oligomer to draw an electric current therefrom.
Dependencies are inferred from the claim text.