Solvent-free electrode fabrication
AssigneeArkema Inc.
InventorsRamin Amin-Sanayei, Jason Pomante, Wensheng He
Life of this patent
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Abstract
The invention relates to an electrode formed by the blending of dry active powdery electrode forming materials with an aqueous binder dispersion, and the subsequent adhering of the wet binder/dry active powdery electrode-forming materials blend to an electroconductive substrate, resulting in an electrode. The aqueous binder is preferably a fluoropolymer, and more preferably polyvinylidene fluoride (PVDF). The hybrid process provides the good dispersion and small particle size of a wet process, with the energy savings and reduced environmental impact of a dry process. The resulting electrode is useful in energy-storage devices.
Claims15
A method for forming an energy storing device, comprising the steps of:
- a) forming an aqueous binder dispersion composition having discrete particles of one or more polymers;
- b) adding said aqueous binder dispersion to one or more types of dry active powdery electrode-forming materials to form a uniform damp solid blend,
- c) drying said uniform damp solid blend of binder and dry active powdery electrode-forming materials, and
- d) applying said uniform blend to at least one surface of an electroconductive substrate to form an electrode.
A dry blend comprising a fluoropolymer binder and active powdery electrode-forming materials, wherein said fluoropolymer binder exists at least 75 percent by weight as single binder particles, said single binder particles having a weight average particle size of less than 500 nm.
A method for forming an energy storing device, comprising the steps of:
- a) forming an aqueous binder dispersion composition having discrete particles of one or more polymers;
- b) spraying said aqueous binder dispersion onto carbon or activated carbon to form a uniform damp blend, and
- c) applying said uniform blend to at least one surface of an electroconductive substrate to form an electrode.
Dependencies are inferred from the claim text.