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US 2019/0379049 A1Published application
Binder for electrochemical element
AssigneeIdemitsu Kosan Co., Ltd.
InventorYu ISHIHARA
Life of this patent
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Abstract
A binder for an electrochemical element, containing a polymer having both an anionic unit and a nonionic unit, wherein a part of the anionic unit is neutralized, and a degree of neutralization of the anionic unit in the polymer is 95% or less. Optionally, the anionic unit in the polymer is a carboxyl group, a sulfo group, a phosphonate group, a phosphinate group or a phosphate group.
Claims18
1:
- A binder, comprising a polymer having both an anionic unit and a nonionic unit,
- wherein a part of the anionic unit is neutralized, and a degree of neutralization of the anionic unit in the polymer is 95% or less.
2:
- The binder element according to claim 1, wherein the anionic unit is a carboxyl group, a sulfo group, a phosphonate group, a phosphinate group or a phosphate group.
3:
- The binder according to claim 1, wherein a cation that neutralizes the anionic unit is an alkali metal ion or an alkaline earth metal ion.
4:
- The binder according to claim 1, wherein the nonionic unit is an ester bond of a carboxyl group, a sulfo group, a phosphonate group or a phosphinate group, a carboxylic acid amide bond, a hydroxy group or an ether bond.
5:
- The binder according to claim 1, wherein a mole ratio of the anionic unit to the nonionic unit is from 2:8 to 8:2.
6:
- The binder according to claim 1, wherein the polymer is a polymer having an anionic unit and a nonionic unit in a same repeating unit, and the same repeating unit occupies 50% or more of all the repeating units.
7:
- The binder according to claim 1, wherein a repeating unit containing an aromatic hydrocarbon group contained in the polymer occupies 20% or less of all the repeating units.
8:
- The binder according to claim 1, wherein the polymer is a polyamide containing a repeating unit having a carboxylic acid amide bond.
9:
- The binder according to claim 1, wherein the polymer is a polymer containing a repeating unit represented by formula (1):
- wherein x is an integer of 0 or more and 5 or less, y is an integer of 1 or more and 7 or less, and z is an integer of 0 or more and 5 or less;
- X is a hydrogen ion, an alkali metal ion or an alkaline earth metal ion;
- R1 is a hydrogen atom or a functional group having 10 or less carbon atoms;
- and
- n is a repeating number.
3 more elements
10:
- The binder according to claim 1, wherein the polymer is a polymer containing 50% or more of a repeating unit composed of amino acid or a neutralized product of amino acid.
11:
- The binder according to claim 1, wherein 50% or more of the repeating unit of the polymer is a polymer composed of glutamic acid or a neutralized product of glutamic acid, or aspartic acid or a neutralized product of aspartic acid.
12:
- The binder according to claim 1, wherein the polymer is poly-γ-glutamic acid or a neutralized product of poly-γ-glutamic acid.
13:
- The binder according to claim 1, wherein a weight-average molecular weight (Mw, polyethylene glycol equivalent) of the polymer is from 50,000 to 9,000,000.
14:
- The binder according to claim 1, further comprising water.
15:
- An electrode composition, comprising the binder according to claim 1.
16:
- An electrode, comprising the binder according to claim 1.
17:
- An electrochemical element, comprising the binder according to claim 1.
18:
- The electrochemical element according to claim 17, wherein the electrochemical element is a lithium-ion battery comprising the binder in one or more selected from an electrode, a separator protective layer and an electrode protective layer, or is an electric double-layer capacitor comprising the binder in the electrode.