Aqueous composition for lithium-ion secondary battery positive electrode, positive electrode for lithium-ion secondary battery, and lithium-ion secondary battery

By using a conductive additive with a controlled oxygen-to-carbon ratio and a particulate (co)polymer with ethylenically unsaturated carboxylic acid units, the composition stabilizes viscosity and prevents electrode cracking, enhancing manufacturing efficiency in lithium-ion secondary batteries.

JP7833625B2Active Publication Date: 2026-03-19ASAHI KASEI KOGYO KABUSHIKI KAISHA
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2025-02-05
Publication Date
2026-03-19

AI Technical Summary

Technical Problem

Existing aqueous compositions for lithium-ion secondary battery positive electrodes suffer from viscosity instability and electrode cracking issues, particularly when using specific conductive additives and binders, which affect the manufacturing process and product yield.

Method used

The composition includes a conductive additive with a specific oxygen-to-carbon ratio on its surface and a particulate (co)polymer containing ethylenically unsaturated carboxylic acid units, within defined content ranges, to stabilize viscosity and prevent electrode cracking.

Benefits of technology

The solution provides excellent viscosity stability and suppresses electrode cracking, enabling uniform coating and improved product yield in lithium-ion secondary batteries.

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Abstract

This aqueous composition for a positive electrode for a lithium-ion secondary battery contains a conductive auxiliary agent and a particulate (co)polymer, in which; when elements present on the surface of the conductive auxiliary agent are measured by an X-ray photoelectron spectroscopic analysis method and the abundance ratio (mass %) of oxygen atoms and the abundance ratio (mass %) of carbon atoms are calculated on the basis of peak areas, the abundance ratio of the oxygen atoms on the surface of the conductive auxiliary agent is within a predetermined numerical range, and the ratio of the abundance ratio of the oxygen atoms present on the surface to the abundance ratio of the carbon atoms present on the surface is within a predetermined numerical range; and the particulate (co)polymer includes a predetermined amount of a constitutional unit derived from ethylenically unsaturated carboxylic acid (carboxylate).
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Citation Information

Patent Citations

  • Composition for capacitor electrode formation, capacitor electrode, and capacitor

    JP2015070089A

  • Aqueous composition for forming secondary battery electrode, secondary battery electrode, and secondary battery

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