Polymeric binder of polyacrylic acid, polyfunctional amine, and linking benzene ring

Patent metadata

Field	Value
Publication number	US-10875964-B2
Application number	US-201716094029-A
Country	US
Kind code	B2
Filing date	Mar 27, 2017
Priority date	Apr 21, 2016
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A polymer compound to be used as a binder for a negative electrode of a power storage device is provided. The polymer compound is formed by condensation of a polyacrylic acid and a polyfunctional amine represented by the following general formula (1), where X is a ring structure having 1 to 3 benzene rings; and C 1 to C 4 are each a carbon atom constituting a benzene ring in the ring structure.

First claim

The invention claimed is:

1. A negative electrode for a power storage device, comprising:
a current collector made of a metal material; and
a negative electrode active substance layer bonded onto the current collector, wherein
the negative electrode active substance layer contains a negative electrode binder for bonding the negative electrode active substance to the current collector, and
a polymer compound to be used as the negative electrode binder
a polymer compound to be used as the negative electrode binder comprises a chain structure constituted of a polyacrylic acid and a crosslinked structure connecting carboxylic acid side chains in the chain structure or between the chain structures, and
the crosslinked structure is a crosslinked structure represented in the following general formula (6), where PAA is a chain structure constituted of a polyacrylic acid, X is a ring structure having 1 to 3 benzene rings, and C 1 to C 4 are each a carbon atom constituting a benzene ring in the ring structure

2. The negative electrode according to claim 1 , wherein the ring structure is at least one ring structure selected from the following general formulae (2) to (4), where A is a methylene group or an oxygen atom, and n is 0, 1, or 2

3. The negative electrode according to claim 1 , wherein
the crosslinked structure has a first crosslinked structure represented by the general formula (6) and a second crosslinked structure, which is at least one selected from crosslinked structures represented by the following general formulae (7) to (9), and
PAA is a chain structure constituted of a polyacrylic acid, and Z is a structure represented by the following general formula (10), where Y is a linear 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. An intermediate composition of a polymer compound to be used as a binder for a negative electrode of a power storage device, the intermediate composition comprising:
a polyacrylic acid, a solvent, and a polyfunctional amine represented by the following general formula (1), where X is a ring structure having 1 to 3 benzene rings, and C 1 to C 4 are each a carbon atom constituting a benzene ring in the ring structure

5. A method for producing the negative electrode according to any one of claim 1 , the method comprising:
condensing a polyacrylic acid and a polyfunctional amine represented by the following general formula (1) to form the polymer compound in the negative electrode active substance layer, where X is a ring structure having 1 to 3 benzene rings, and C′ to C 4 are each a carbon atom constituting a benzene ring in the ring structure

6. A negative electrode according to claim 1 , wherein the negative electrode active substance is at least one selected from a carbon substance capable of occluding and releasing lithium, an element that can be alloyed with lithium, and a compound containing an element that can be alloyed with lithium.

7. The negative electrode according to claim 6 , wherein the negative electrode active substance is at least one selected from a silicon material obtained from CaSi 2 through a decalcification reaction, Si, and SiO v (0<V≤2).

8. A power storage device comprising the negative electrode according to claim 6 and a nonaqueous electrolyte.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Sugiyama Yusuke
• Kondo Takeshi
• Goda Nobuhiro

Classifications

• C08F8/48

  Isomerisation; Cyclisation · CPC title

• H01M4/133

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

• C08F2810/20

  leading to a crosslinking, either explicitly or inherently · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• C08F8/32 Primary

  by reaction with amines · CPC title