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US 11,081,760 B2Granted
Coated battery separator
AssigneeSolvay Specialty Polymers Italy S.P.A.
InventorsMaurizio Biso, Elena Molena, Roberta Colombo
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Abstract
The present invention pertains to an at least partially coated separator for an electrochemical cell, to a method for its preparation and to an electrochemical cell comprising such separator.
Claims19
A separator for an electrochemical cell, the separator comprising a substrate layer (P) at least partially coated with a composition (C), said composition (C) comprising:
- a plurality of primary particles comprising at least one vinylidene fluoride copolymer (A) comprising at least 10 wt % of recurring units derived from hexafluoropropylene, and
- a plurality of primary particles comprising at least one vinylidene fluoride polymer (B) comprising less than 1 wt % of recurring units derived from hexafluoropropylene, wherein the primary particles of copolymer (A) and of polymer (B) have an average primary particle size of less than 1 micrometer, as measured according to ISO 13321.
An aqueous composition comprising an emulsion in water of a mixture of:
- a) primary particles comprising at least one vinylidene fluoride copolymer (A) comprising at least 10 wt % of recurring units derived from hexafluoropropylene, and b) primary particles comprising at least one vinylidene fluoride polymer (B) comprising less than 1 wt % of recurring units derived from hexafluoropropylene, wherein the primary particles of copolymer (A) and of polymer (B) have an average primary particle size of less than 1 micrometer, as measured according to ISO 13321.
Dependencies are inferred from the claim text.