Binder for lithium cell

Patent metadata

Field	Value
Publication number	US-10854881-B2
Application number	US-201515305521-A
Country	US
Kind code	B2
Filing date	Apr 21, 2015
Priority date	Apr 21, 2014
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

The present invention relates to “a binder for a lithium cell comprises a polymer having a monomer unit derived from acrylic acid, and 1 to 2 kinds of monomer units derived from the compound shown by the general formula (I), the general formula (II), or the general formula (III), as constituents, and cross-linked by a cross-linking agent selected from the compounds described by the following general formulae [1] to [13], and the polymer described by the following general formula [14]”, “a composition for producing an electrode of a lithium cell comprising 1) an active material containing silicon, 2) a conductive assistant, and 3) the above-described binder for a cell”, and “an electrode for a lithium cell having 1) an active material containing silicon, 2) a conductive assistant, 3) the above-described binder for a cell, and (4) a current collector”.

First claim

The invention claimed is:

1. A binder for a lithium cell, comprising a polymer having
(i) an acrylic acid monomer unit, and
(ii) 1 to 2 kinds of monomer units other than acrylic acid derived from a compound represented by the following general formula (I) or general formula (II), as constituents, and
cross-linked by a cross-linking agent which is a compounds represented by the following general formulae [4];

wherein R 1 represents hydrogen atom or a methyl group, and provided that in the case where R 2 is hydrogen atom, R 1 represents a methyl group; R 2 represents hydrogen atom, an alkyl group having 1 to 20 carbon atoms; an alkyl group having 1 to 20 carbon atoms, which is substituted with fluorine atom, a hydroxyl group or a cyano group; an aryl group having 6 to 10 carbon atoms; an arylalkyl group having 7 to 13 carbon atoms; an alkoxyalkyl group having 2 to 9 carbon atoms; an alkoxyalkoxyalkyl group having 3 to 9 carbon atoms; an aryloxyalkyl group having 7 to 13 carbon atoms; a morpholinoalkyl group having 5 to 7 carbon atoms; a trialkylsilyl group having 3 to 9 carbon atoms; an alicyclic hydrocarbon group having 6 to 10 carbon atoms, which has oxygen or does not have oxygen; a dialkylaminoalkyl group having 3 to 9 carbon atoms; a hexahydrophthalimide-N-alkyl group having 9 to 15 carbon atoms; the group shown by the following general formula (IV)

wherein R 3 represents an alkylene group having 1 to 6 carbon atoms, which has a hydroxyl group as a substituent or does not have a substituent; R 4 represents hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a phenyl group; “v” represents an integer of 2 to 20;

or the group shown by the following general formula (V)

wherein R 5 to R 7 each independently represent an alkyl group having 1 to 3 carbon atoms;
R 8 represents an alkylene group having 1 to 3 carbon atoms,

wherein R 11 represents hydrogen atom or a methyl group; R 12 represents hydrogen atom, or alkyl group having 1 to 6 carbon atoms; R 13 represents hydrogen atom, an alkyl group having 1 to 6 carbon atoms; a dialkylaminoalkyl group having 3 to 9 carbon atoms; or a hydroxyalkyl group having 1 to 6 carbon atoms,

wherein R 3 4 to R 3 7 each independently represent an alkylene group having 1 to 6 carbon atoms; 1 represents an integer of 1 to 6; m represents an integer of 0 to 6; v1 and v2 each independently represent an integer of 0 or 1.

2. The binder according to claim 1 , wherein the polymer has
(i) the acrylic acid monomer unit, and
(ii) 1 to 2 kinds of monomer units other than acrylic acid derived from a compound represented by the following general formula (I-I) or general formula (II-I), as constituents;

wherein R 101 represents hydrogen atom or a methyl group, and provided that when R 201 is hydrogen atom, R 101 represents a methyl group; R 201 represents hydrogen atom, the alkyl group having 1 to 20 carbon atoms, the alkyl group having 1 to 20 carbon atoms, substituted with fluorine atom, a hydroxyl group or a cyano group, the arylalkyl group having 7 to 13 carbon atoms, the aryloxyalkyl group having 7 to 13 carbon atoms, the hexahydrophthalimide-N-alkyl group having 9 to 15 carbon atoms, or the group shown by the following general formula (IV-I)

wherein R 301 represents the alkylene group having 1 to 3 carbon atoms, which has a hydroxyl group as a substituent or does not have a substituent; R 401 represents hydrogen atom, the alkyl group having 1 to 6 carbon atoms, or a phenyl group; and “v” is the same as described above,

wherein R 111 represents hydrogen atom or a methyl group; R 121 represents hydrogen atom, the alkyl group having 1 to 6 carbon atoms; and R 131 represents hydrogen atom, the alkyl group having 1 to 6 carbon atoms, or the hydroxyalkyl having 1 to 6 carbon atoms.

3. The binder according to claim 2 , wherein the polymer has
(i) the acrylic acid monomer unit, and
(ii) 1 to 2 kinds of monomer units other than acrylic acid derived from a compound represented by the following general formula (I-II) or general formula (II-II), as constituents:

wherein R 102 represents hydrogen atom or a methyl group (provided that when R 202 is hydrogen atom, R 102 represents a methyl group); R 202 represents hydrogen atom, the alkyl group having 1 to 20 carbon atoms, the alkyl group having 1 to 20 carbon atoms, substituted with fluorine atom, a hydroxyl group or a cyano group, the aryloxyalkyl group having 7 to 13 carbon atoms, or the group shown by the following general formula (IV-II)

wherein R 302 represents the alkylene group having 1 to 3 carbon atoms; R 402 represents hydrogen atom, or the alkyl group having 1 to 6 carbon atoms; and “v” is the same as described above,

wherein R 112 represents hydrogen atom or a methyl group; R 122 and R 132 each independently represent hydrogen atom, or the alkyl group having 1 to 3 carbon atoms.

4. The binder according to claim 1 , wherein the polymer has
(i) the acrylic acid monomer unit, and
(ii) 1 to 2 kinds of monomer units other than acrylic acid derived from a compound represented by the following general formula (I-II) or general formula (II-II), as constituents:

wherein R 102 represents hydrogen atom or a methyl group (provided that when R 202 is hydrogen atom, R 102 represents a methyl group); R 202 represents hydrogen atom, the alkyl group having 1 to 20 carbon atoms, the alkyl group having 1 to 20 carbon atoms, substituted with fluorine atom, a hydroxyl group or a cyano group, the aryloxyalkyl group having 7 to 13 carbon atoms, or the group shown by the following general formula (IV-II)

wherein R 302 represents the alkylene group having 1 to 3 carbon atoms; R 402 represents hydrogen atom, or the alkyl group having 1 to 6 carbon atoms; and “v” is the same as described above,

wherein R 112 represents hydrogen atom or a methyl group; R 122 and R 132 each independently represent hydrogen atom, or the alkyl group having 1 to 3 carbon atoms.

5. The binder according to claim 1 , wherein the polymer is neutralized.

6. The binder according to claim 1 , wherein the polymer is neutralized with sodium hydroxide.

7. The binder according to claim 1 , wherein the polymer is dissolved or dispersed in water.

8. A compo

Assignees

• Fujifilm Wako Pure Chemical Corp
• Univ Tokyo Science Found

Inventors

• Komaba Shinichi
• YAMAGIWA Kiyofumi
• Aoki Shoko
• Okamoto Kuniaki
• Kiyosu Takahiro
• Mori Yasuyoshi
• Matsuura Takatoshi
• Sato Michihiko

Classifications

• H01M4/624

  Electric conductive fillers · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/622 Primary

  being polymers · CPC title

• C08F220/1806

  C6-(meth)acrylate, e.g. (cyclo)hexyl (meth)acrylate or phenyl (meth)acrylate · CPC title