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US 12,391,810 B2Granted
Gelled polymer membrane for Li-ion battery
AssigneeArkema France
InventorsStephane Bizet, Gregory Schmidt, Jerome Chauveau
Life of this patent
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Abstract
The invention relates to a fluoropolymer film which makes it possible to manufacture a gelled dense membrane which offers a very good compromise between ionic conductivity and mechanical strength after swelling. This membrane is intended for use as a separator for Li-ion batteries.
Claims17
A nonporous fluoropolymer film comprising one or more layers, wherein at least one layer (layer A) consists of a mixture of two fluoropolymers:
- a. fluoropolymer A which comprises at least one copolymer of vinylidene fluoride (VDF) and hexafluoropropylene (HFP) having an HFP content of greater than or equal to 3% by weight, and
- b. fluoropolymer B which comprises a VDF homopolymer and/or at least one VDF-HFP copolymer, said fluoropolymer B having a weight content of HFP which is at least 3% by weight lower than the weight content of HFP of the polymer A.
Dependencies are inferred from the claim text.