Battery separator, lithium-ion battery, and preparation methods thereof
AssigneeBYD Company Limited
InventorsLina JIN, Jun SHAN, Gang HU, Long HE
Life of this patent
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Abstract
The present disclosure relates to the field of lithium-ion batteries, and discloses a battery separator and a lithium-ion battery, and preparation methods thereof. The battery separator includes a porous base membrane and a bonding layer attached to at least one side surface of the porous base membrane, wherein the bonding layer contains an acrylate crosslinked polymer and a styrene-acrylate crosslinked copolymer and/or a vinylidene fluoride-hexafluoropropylene copolymer, and the porosity of the bonding layer is 40-65%.
Claims22
A battery separator, comprising
- a porous base membrane, and
- a bonding layer attached to at least one side surface of the porous base membrane,
- wherein the bonding layer contains an acrylate crosslinked polymer and a styrene-acrylate crosslinked copolymer but does not contain a vinylidene fluoride-hexafluoropropylene copolymer, or the bonding layer contains an acrylate crosslinked polymer and a vinylidene fluoride-hexafluoropropylene copolymer but does not contain a styrene-acrylate crosslinked copolymer, or the bonding layer contains an acrylate crosslinked polymer, a styrene-acrylate crosslinked copolymer and a vinylidene fluoride-hexafluoropropylene copolymer, and
- the porosity of the bonding layer is 40-65%.
A preparation method of a battery separator, comprising:
- attaching a slurry containing a self-crosslinked pure acrylic emulsion and a self-crosslinked styrene-acrylic emulsion and/or a vinylidene fluoride-hexafluoropropylene copolymer emulsion to at least one side surface of a porous base membrane, and
- drying to form a bonding layer having a porosity of 40-65% on at least one side surface of the porous base membrane.
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Dependencies are inferred from the claim text.