Polymer compound, intermediate composition, negative electrode, electricity storage device, and method for producing polymer compound

Patent metadata

Field	Value
Publication number	US-11118014-B2
Application number	US-201716339188-A
Country	US
Kind code	B2
Filing date	Aug 29, 2017
Priority date	Oct 6, 2016
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

A polymer compound includes a first chain structure constituted by a polyamideimide and a second chain structure constituted by a vinyl polymer and bonded to terminals of the first chain structures and connecting the first chain structures together. The vinyl polymer constituting the second chain structure is a random copolymer including a bond-constituting unit having a side chain to be bonded to the first chain structure, and a non-bond-constituting unit having no side chain to be bonded to the first chain structure.

First claim

The invention claimed is:

1. A polymer compound for use as a negative electrode binder of an electricity storage device, the polymer compound being characterized by:
a first chain structure constituted by a polyamideimide; and
a second chain structure constituted by a vinyl polymer and bonded to terminals of the first chain structures and connecting the first chain structures together, wherein
the vinyl polymer constituting the second chain structure is a random copolymer comprising
a bond-constituting unit having a side chain to be bonded to the first chain structure, and
a non-bond-constituting unit having no side chain to be bonded to the first chain structure,

the first chain structure and the second chain structure are bonded together through at least one of an amide bond and an imide bond, and
a bond structure between the first chain structure and the second chain structure is a bond structure represented by the following general formula (1):

where PAI is the first chain structure; Poly is the second chain structure; and X is a structure represented by the following general formula (2):

where Y is a straight-chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom; and R1 and R2 are each independently a hydrogen atom, a methyl group, a trifluoromethyl group, or a methoxy group.

2. A polymer compound for use as a negative electrode binder of an electricity storage device, characterized in that
the polymer compound is made by condensing a polyamideimide, a vinyl polymer, and a polyfunctional amine,
the vinyl polymer is a random copolymer comprising, as constitutional units,
a vinyl monomer having a side chain capable of forming an amide bond or an imide bond between the vinyl polymer and an amino group or a carboxyl group, and
a vinyl monomer forming no amide bond nor imide bond between the vinyl polymer and an amino group or a carboxyl group, and

the polyfunctional amine is an aromatic polyfunctional amine represented by the following general formula (3):

where Y is a straight-chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom; and R1 and R2 are each independently a hydrogen atom, a methyl group, a trifluoromethyl group, or a methoxy group.

3. An intermediate composition of a polymer compound for use as a negative electrode binder of an electricity storage device, the intermediate composition being characterized by:
a polyamideimide;
a vinyl polymer; and
a polyfunctional amine, wherein
the vinyl polymer is a random copolymer comprising, as constitutional units,
a vinyl monomer having a side chain capable of forming an amide bond or an imide bond between the vinyl polymer and an amino group or a carboxyl group, and
a vinyl monomer forming no amide bond nor imide bond between the vinyl polymer and an amino group or a carboxyl group, and

the polyfunctional amine is an aromatic polyfunctional amine represented by the following general formula (3):

where Y is a straight-chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom; and R1 and R2 are each independently a hydrogen atom, a methyl group, a trifluoromethyl group, or a methoxy group.

4. A method for producing a polymer compound for use as a negative electrode binder of an electricity storage device, the method comprising condensing a polyamideimide, a vinyl polymer, and a polyfunctional amine, wherein
the vinyl polymer is a random copolymer comprising, as constitutional units,
a vinyl monomer having a side chain capable of forming an amide bond or an imide bond between the vinyl polymer and an amino group or a carboxyl group, and
a vinyl monomer forming no amide bond nor imide bond between the vinyl polymer and an amino group or a carboxyl group, and

the polyfunctional amine is an aromatic polyfunctional amine represented by the following general formula (3):

where Y is a straight-chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom; and R1 and R2 are each independently a hydrogen atom, a methyl group, a trifluoromethyl group, or a methoxy group.

5. A negative electrode of an electricity storage device, comprising:
a binder comprising a polymer compound; and
a negative electrode active material,
wherein the negative electrode active material is at least one selected from carbon-based materials capable of occluding and releasing lithium, elements alloyable with lithium, and compounds having an element alloyable with lithium,
the polymer compound is made by condensing a polyamideimide, a vinyl polymer, and an aromatic polyfunctional amine,
the polyamideimide includes a terminal provided with a carboxyl group,
the aromatic polyfunctional amine is represented by following general formula (3),
the polymer compound includes:
a first chain structure constituted by the polyamideimide; and
a second chain structure constituted by the vinyl polymer and bonded to terminals of the first chain structures and connecting the first chain structures together,

the vinyl polymer is a random copolymer comprising, as constitutional units,
a bonding monomer, which is a vinyl monomer having a side chain capable of forming an amide bond or an imide bond between the vinyl polymer and an amino group or a carboxyl group, and
a non-bonding monomer, which is a vinyl monomer forming no amide bond nor imide bond between the vinyl polymer and an amino group or a carboxyl group,

the vinyl monomer having the side chain includes a carboxyl group as the side chain,
the ratio of the bonding monomer and the non-bonding monomer in the vinyl polymer (the bonding monomer:the non-bonding monomer) is in the range of 1:1 to 1:10,
the mole ratio of the number of bonding monomers contained in the vinyl polymer to the number of carboxyl groups of terminals of the polyamideimide (the number of bonding monomers/the number of carboxyl groups of polyamideimide) is greater than 1,
the molar ratio of the number of bonding monomers contained in the vinyl polymer to the number of the polyamideimide (the number of bonding monomers/the number of the polyamideimide) is less than or equal to 10,
a bond structure containing at least one of an amide bond and an imide bond between carboxyl group of the terminals of the first chain structures and carboxyl group of the side chain of the bonding monomers in the second chain structure,
the amide bond is represented by the following general formula (1),
the imide bond is made by bonding carboxyl groups of terminals of the polyamideimide to nitrogen atom in the following general formula (1),
the second chain structure has a carboxyl group, which is not bonded to the terminals of the first chain structures and is capped by the aromatic polyfunctional amine represented by following general formula (3), as the side chain of the bonding monomers,
in the following general formulas (1) to (3), PAI is the first chain structure; Poly is the second chain structure; and X is a structure represented by the following general formula (2), Y is a straight-chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom, and R1 and R2 are each independently a hydrogen atom, a methyl group, a trifluoromethyl group, or a methoxy group.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Sugiyama Yusuke
• Kondo Takeshi
• Sugioka Takahiro
• Mase Kohei
• Oyaizu Keigo

Classifications

• H01M4/622

  being polymers · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• C08G73/14 Primary

  Polyamide-imides · CPC title