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US 2006/0216596 A1Published application
PTFE copolymer and binding for coating cathode particles
OwnerMichael Cheikyinventor
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Abstract
An improved cathode film is formed by forming a copolymer of 10 to 90 mol percent of a fluorinated ethylene copolymer such as tetrafluoroethylene soluble in an organic solvent such as acetone. An ionically conductive salt such as potassium trifluorosulfonate is added to a solution of the copolymer. The solution is applied to particles of active cathode material such as AgO. The solvent is removed to form a film which can be pressed onto a current collector.
Claims15
An electrode film containing a dispersion of electrode particles comprising in combination:
- a film of a mixture of a copolymer and an ionically conductive salt, said copolymer soluble in organic solvent and containing at least 10 mol percent of a fluorinated ethylene polymer, the remainder being a second polymer providing solubility in an organic solvent, said soluble copolymer coating and binding particles of cathode material to form said film.
A method of forming an electrode comprising the steps of:
- dissolving a copolymer of fluorinated ethylene and an ionically conductive salt in organic solvent to form a suspension;
- adding active electrode material to the suspension;
- removing the solvent to form a cake;
- and
- pressing the cake to form an electrode film.
2 more elements
Dependencies are inferred from the claim text.