Carbon nanotube dispersion, slurry for electrode, electrode, and secondary battery

WO2025253707A1PCT designated stage Publication Date: 2025-12-11SUMITOMO CHEM CO LTD
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Patent Information

Application Number
PCT/JP2025/004727
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-06-07
Filing Date
2025-02-13
Publication Date
2025-12-11

AI Technical Summary

Technical Problem

Existing carbon nanotube dispersions do not effectively enhance the cycle characteristics of secondary batteries, as they lack specific particle size distributions and ratios that optimize conductivity and dispersion stability.

Method used

A carbon nanotube dispersion with two distinct particle size peaks, where the ratio of frequencies and sizes of these peaks are optimized to 0.5 to 3.0 and 2.0 to 25.0, respectively, ensuring long CNTs form conductive paths while short CNTs act as binders, preventing agglomeration and reducing contact resistance.

Benefits of technology

This dispersion leads to secondary batteries with improved cycle characteristics by enhancing conductivity and physical strength through optimized CNT distribution and dispersion.

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Abstract

Provided is a carbon nanotube dispersion or the like with which it is possible to produce a battery having exceptional cycle characteristics.　This carbon nanotube dispersion contains carbon nanotubes and a dispersion medium, the carbon nanotube dispersion satisfying conditions (1), (2), (3), and (4). (1) There are two peaks at which the frequency reaches a maximum in a volume-based particle size distribution spectrum measured through a scattering particle size distribution measurement method. (2) The ratio (frequency 1 / frequency 2) of the frequency 1 at the peak top of a first peak to the frequency 2 at the peak top of a second peak is 0.5-3.0, where the first peak is the peak having the greater particle diameter among the two peaks, and the second peak is the peak having the smaller particle diameter. (3) The ratio (particle size 1 / particle size 2) of the particle size 1 at the peak top of the first peak to the particle size 2 at the peak top of the second peak is 2.0-25.0. (4) The particle size 1 is 2.0-20.0 μm.
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Citation Information

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