Waterborne fluoropolymer composition

摘要

This invention relates to a waterborne fluoropolymer composition useful for the fabrication of Li-Ion-Battery (LIB) electrodes. The fluoropolymer composition contains an organic carbonate compound, which is more environmentally friendly than other fugitive adhesion promoters currently used in waterborne fluoropolymer binders. An especially useful organic carbonate compound is ethylene carbonate (EC) and vinylene carbonate (VC), which are solids at room temperature, and other carbonates which are liquid at room temperature such as propylene carbonate, methyl carbonate and ethyl carbonate. The composition of the invention is low cost, environmentally friendly, safer, and has enhanced performance compared to current compositions.

主权项

1. An electrode comprising an electroconductive substrate coated on at least one surface with an aqueous composition comprising:
a) from 0.5 to 150 parts of fluoropolymer particles having a weight average particle size of less than 500 nm, wherein said fluoropolymer is a polyvinylidene fluoride (PVDF) homopolymer or copolymer comprising at least 70 mole percent of vinylidene fluoride units; b) from 10 to 500 parts of one or more powdery electrode-forming materials; c) from 1 to 150 parts of one or more organic carbonates; d) 100 parts of water;all parts are by weight and based on 100 parts by weight of water.