Li-ion battery having improved safety against combustion

Patent metadata

Field	Value
Publication number	US-2020028129-A1
Application number	US-201916585804-A
Country	US
Kind code	A1
Filing date	Sep 27, 2019
Priority date	Aug 30, 2012
Publication date	Jan 23, 2020
Grant date	—

Abstract

A Li-ion battery is provided in combination with fluorinated material positioned effective to abate combustion by said battery, the fluorinated material being normally non-gaseous and non-liquid and being itself effective to provide the combustion abatement by said battery, such fluorinated material being is such forms as the material of construction of the battery case containing the battery, film wrapped around said battery, and/or semi-solid material at least proximate to the battery, such as by forming a coating on said battery or said film on said battery.

First claim

What is claimed is:

1 . A coated lithium-ion battery comprising:
a lithium-ion battery; a first fluorinated material comprising fluoropolyether positioned as a coating on said lithium-ion battery, said first fluorinated material being a semi-solid and non-gaseous and non-liquid under normal conditions; and a second fluorinated material comprising fluoropolymer film in contact with said lithium-ion battery; wherein said first and second fluorinated materials are effective to abate combustion of said lithium-ion battery.

2 . The coated lithium-ion battery of claim 1 , wherein the fluoropolymer of said second fluorinated material fluoropolymer film comprises a melt processible tetrafluoroethylene copolymer.

3 . The coated lithium-ion battery of claim 2 , wherein said melt processible tetrafluoroethylene copolymer is selected from the group consisting of tetrafluoroethylene/hexafluoropropylene copolymer, tetrafluoroethylene/hexafluoropropylene/perfluoro(alkyl vinyl ether) copolymer and tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, wherein said perfluoroalkyl group is a linear or branched having from 1 to 5 carbon atoms.

4 . The coated lithium-ion battery of claim 1 , wherein said first fluorinated material further comprises solid fluoropolymer.

5 . The coated lithium-ion battery of claim 4 , wherein said solid fluoropolymer is a thermally destabilizable fluoropolymer having at least 300 unstable end groups per 10 6 carbon atoms, said unstable end groups being selected from the group consisting of —COOH, —COF, and —CONH 2 .

6 . The coated lithium-ion battery of claim 4 wherein said fluoropolyether is normally liquid but is present as a normally non-liquid mixture with said solid fluoropolymer.

7 . The coated lithium-ion battery of claim 1 wherein said fluoropolyether is a perfluoropolyether.

8 . The coated lithium-ion battery of claim 7 wherein oxygen atoms in the backbone of said perfluoropolyether are separated by saturated perfluorocarbon groups having 1 to 3 carbon atoms.

9 . The coated lithium-ion battery of claim 8 wherein said saturated perfluorocarbon groups are at least one selected from the group consisting of: —CFCF 3 —CF 2 —O—, —CF 2 CF 2 CF 2 —O—, —CF 2 CF 2 —O— and —CF 2 O—.

10 . The coated lithium-ion battery of claim 1 wherein said first fluorinated material forms a coating on said second fluorinated material fluoropolymer film.

11 . The coated lithium-ion battery of claim 1 , additionally including a case within which said battery is contained, wherein at least the interior surface of said case comprises melt processible tetrafluoroethylene copolymer.

12 . The coated lithium-ion battery of claim 11 , wherein said melt processible tetrafluoroethylene copolymer is selected from the group consisting of tetrafluoroethylene/hexafluoropropylene copolymer, tetrafluoroethylene/hexafluoropropylene/perfluoro(alkyl vinyl ether) copolymer and tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, wherein said perfluoroalkyl group is a linear or branched having from 1 to 5 carbon atoms.

Assignees

• Chemours Co Fc Llc

Inventors

• Kountz Dennis J
• Hoover James R
• Pruce George Martin

Classifications

• C09K21/14 Primary

  Macromolecular materials · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M2/20

  Electricity · mapped topic

• H01M2/202

  Electricity · mapped topic