Binder composition for secondary battery electrode-use, slurry composition for secondary battery electrode-use, electrode for secondary battery-use, and secondary battery

Patent metadata

Field	Value
Publication number	US-10211461-B2
Application number	US-201515126587-A
Country	US
Kind code	B2
Filing date	Apr 1, 2015
Priority date	Apr 2, 2014
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

Provided is a binder composition for secondary battery electrode-use that has high binding capacity, and that is capable of suppressing corrosion of a current collector and an increase in internal resistance when used in production of a secondary battery. The binder composition for secondary battery electrode-use contains a copolymer and a dispersion medium. The copolymer includes at least 5 mass % and no greater than 80 mass % of a constitutional unit represented by formula (I) and at least 5 mass % and no greater than 90 mass % of a constitutional unit represented by formula (II).

First claim

The invention claimed is:

1. A binder composition for secondary battery electrode-use comprising:
a copolymer; and
a dispersion medium, wherein
the copolymer includes at least 5 mass % and no greater than 80 mass % of a constitutional unit represented by formula (I) shown below

where, in formula (I), R 1 represents hydrogen or a monovalent organic group, R 2 , R 3 , and R 4 each represent, independently of one another, hydrogen or a monovalent organic group, X represents a hydrocarbon chain, and A − represents a monovalent anion selected from the group consisting of a bis(trifluoromethanesulfonyl)imide anion, a bis(fluorosulfonyl)imide anion, a perfluoroalkanesulfonate anion, and a monoalkyl sulfate anion,
the copolymer includes at least 5 mass % and no greater than 90 mass % of a constitutional unit represented by formula (II) shown below

where, in formula (II), R 5 represents hydrogen, a methyl group, or a halogen atom, and
the copolymer includes no greater than 20 mass % of a constitutional unit represented by formula (III) shown below

where, in formula (III), R 6 represents hydrogen or a substituted or unsubstituted alkyl group, and R 7 and R 8 each represent, independently of one another, hydrogen or a group selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, and a substituted or unsubstituted aryl group.

2. The binder composition for secondary battery electrode-use of claim 1 , wherein
R 1 is a methyl group, R 2 , R 3 , and R 4 are each a methyl group or an ethyl group, X is an ethylene group, and A − is a monovalent anion selected from the group consisting of a bis(trifluoromethanesulfonyl)imide anion, a trifluoromethanesulfonate anion, and a monomethyl sulfate anion.

3. A slurry composition for secondary battery electrode-use comprising:
the binder composition for secondary battery electrode-use of claim 1 ; and
an electrode active material.

4. The slurry composition for secondary battery electrode-use of claim 3 , further comprising
a polymer other than the copolymer.

5. The slurry composition for secondary battery electrode-use of claim 4 , wherein
the polymer other than the copolymer is a fluorine-containing polymer.

6. An electrode for secondary battery-use obtainable by applying the slurry composition for secondary battery electrode-use of claim 3 onto a current collector and drying the slurry composition for secondary battery electrode-use that has been applied onto the current collector.

7. A secondary battery comprising:
a positive electrode;
a negative electrode;
an electrolysis solution; and
a separator, wherein
either or both of the positive electrode and the negative electrode are the electrode for secondary battery-use of claim 6 .

Assignees

• Zeon Corp

Inventors

• Oh Ken
• Tanaka Keiichiro
• Fukumine Mayumi

Classifications

• C08F18/22

  Esters containing nitrogen · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/623 Primary

  fluorinated polymers · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/622

  being polymers · CPC title