Binder for secondary battery positive electrode and use of same

WO2026134187A1PCT designated stage Publication Date: 2026-06-25TOAGOSEI CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
TOAGOSEI CO LTD
Filing Date
2025-12-15
Publication Date
2026-06-25

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    Figure JPOXMLDOC01-APPB-T000001
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    Figure JPOXMLDOC01-APPB-T000002
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Abstract

A binder for a secondary battery positive electrode contains a carboxyl group-containing crosslinked polymer or a salt thereof, and a cellulose derivative.
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Claims

1. A binder for the positive electrode of a secondary battery, containing a carboxyl group-containing crosslinked polymer or a salt thereof and a cellulose derivative.

2. The binder for the positive electrode of a secondary battery according to claim 1, wherein the viscosity of a 2% by mass aqueous dispersion of an equal mass mixture of the carboxyl group-containing non-crosslinked polymer or a salt thereof and the cellulose derivative is 100 to 30,000 mPa·s.

3. The binder for a secondary battery positive electrode according to claim 1 or 2, wherein the carboxyl group-containing crosslinked polymer contains 50% by mass or more and 100% by mass or less of structural units derived from ethylenically unsaturated carboxylic acid monomers with respect to its total structural units.

4. The binder for the positive electrode of a secondary battery according to claim 1 or 2, wherein the salt of the carboxyl group-containing crosslinked polymer is a salt in which 80 mol% or more of the carboxyl groups of the carboxyl group-containing crosslinked polymer have been neutralized.

5. A composition for a secondary battery positive electrode mixture layer, comprising a binder for the positive electrode of a secondary battery, a positive electrode active material, and water, as described in claim 1 or 2.

6. The composition for a secondary battery cathode composite layer according to claim 5, wherein the cathode active material comprises an olivine-type lithium-containing compound.

7. A positive electrode for a secondary battery, comprising a current collector surface, a composite layer formed from the composite composition for a positive electrode composite layer of a secondary battery according to claim 5.

8. A secondary battery comprising the positive electrode of a secondary battery as described in claim 7.