Anode for Li-ion battery
AssigneeArkema France
InventorsDominique Plee, Fabrice Domingues Dos Santos, Gregory Schmidt
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Abstract
The invention relates to an anode for a Li-ion rechargeable battery, said anode being covered with a protective film based on fluorinated copolymer(s). The invention also relates to the processes for preparing this anode. The invention also relates to a Li-ion rechargeable battery comprising an anode according to the invention. The invention lastly relates to the use of fluorinated copolymer(s) as film for covering an anode for a lithium-ion battery comprising a negative electrode active material.
Claims17
Anode for lithium-ion battery, comprising a negative electrode active material, said anode being covered with a film comprising at least one copolymer chosen from:
- the copolymer comprising vinylidene fluoride and trifluoroethylene units of formula P(VDF-TrFE),
- the copolymer comprising vinylidene fluoride and tetrafluoroethylene units of formula P(VDF-TFE), and
- a fluorinated terpolymer chosen from:
- the terpolymer comprising vinylidene fluoride, trifluoroethylene and chlorofluoroethylene units of formula P(VDF-TrFE-CFE), the terpolymer comprising vinylidene fluoride, trifluoroethylene and chlorotrifluoroethylene units of formula P(VDF-TrFE-CTFE), the terpolymer comprising vinylidene fluoride, trifluoroethylene and hexafluoropropylene units of formula P(VDf-TrFE-HFP), the terpolymer comprising vinylidene fluoride, tetrafluoroethylene and chlorofluoroethylene units of formula P(VDF-TFE-CFE), the terpolymer comprising vinylidene fluoride, tetrafluoroethylene and chlorotrifluoroethylene units of formula P(VDF-TFE-CTFE), and the terpolymer comprising vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene units of formula P(VDf-TFE-HFP),
- or a blend chosen from:
- the blend of P(VDF-TrFE) copolymer with the P(VDF-TFE) copolymer;
- the blend of P(VDF-TrFE) copolymer with one of the aforementioned terpolymers;
- the blend of P(VDF-TFE) copolymer with one of the aforementioned terpolymers, and the blend of two terpolymers among the aforementioned ones;
- in which the negative electrode active material is an alkali metal.
A film for covering an anode for a lithium-ion battery comprising a negative electrode active material, the film comprising a copolymer chosen from:
- the copolymer comprising vinylidene fluoride and trifluoroethylene units of formula P(VDF-TrFE),
- the copolymer comprising vinylidene fluoride and tetrafluoroethylene units of formula P(VDF-TFE), and
- a fluorinated terpolymer chosen from:
- the terpolymer comprising vinylidene fluoride, trifluoroethylene and chlorofluoroethylene units of formula P(VDF-TrFE-CFE), the terpolymer comprising vinylidene fluoride, trifluoroethylene and chlorotrifluoroethylene units of formula P(VDF-TrFE-CTFE), the terpolymer comprising vinylidene fluoride, trifluoroethylene and hexafluoropropylene units of formula P(VDf-TrFE-HFP), the terpolymer comprising vinylidene fluoride, tetrafluoroethylene and chlorofluoroethylene units of formula P(VDF-TFE-CFE), the terpolymer comprising vinylidene fluoride, tetrafluoroethylene and chlorotrifluoroethylene units of formula P(VDF-TFE-CTFE), and the terpolymer comprising vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene units of formula P(VDf-TFE-HFP),
- or of a blend chosen from:
- the blend of P(VDF-TrFE) copolymer with the P(VDF-TFE) copolymer;
- the blend of P(VDF-TrFE) copolymer with one of the aforementioned terpolymers;
- the blend of P(VDF-TFE) copolymer with one of the aforementioned terpolymers, and the blend of two terpolymers among the aforementioned ones;
- wherein the film is configured to inhibit the formation of lithium dendrites within the negative electrode active material.
Dependencies are inferred from the claim text.