Positive electrode composition, positive electrode and method for manufacturing the same, and battery

The positive electrode composition with carbon black and carbon nanotubes addresses conductivity issues in lithium-ion batteries, enhancing discharge rate and cycle characteristics through optimized dispersion and conductive pathways.

JP7864821B2Active Publication Date: 2026-05-25DENKA CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
DENKA CO LTD
Filing Date
2023-01-17
Publication Date
2026-05-25

AI Technical Summary

Technical Problem

Lithium-ion secondary batteries face challenges in achieving low internal resistance and excellent discharge rate and cycle characteristics due to poor conductivity of positive electrode active materials, leading to incomplete utilization of active materials and reduced battery life.

Method used

A positive electrode composition comprising carbon black and carbon nanotubes with specific viscosity ratios, BET surface areas, and crystallite sizes, applied to form a composite layer on a current collector, enhancing conductivity and dispersion.

Benefits of technology

The composition results in lithium-ion secondary batteries with low internal resistance and improved discharge rate and cycle characteristics by ensuring effective conductive pathways and uniform dispersion of active materials.

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Abstract

A positive electrode composition comprising carbon black, carbon nanotubes, an active material, a binding material, and a liquid medium, wherein the solid content concentration is 60-85 mass%, and the ratio (V2 / V1) of the viscosity V2 at a shear velocity of 1(1 / sec) at 25°C relative to the viscosity V1 at a shear velocity of 0.01(1 / sec) at 25°C is 0.02-0.2, inclusive.
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