Method for dehydrating carbonaceous material dispersions and method for producing carbonaceous material dispersions

The method uses dry inert gas to efficiently dehydrate carbonaceous material dispersions in all-solid-state lithium-ion batteries, addressing inefficiencies in existing methods and enhancing battery performance by maintaining dispersion stability and uniformity.

JP7844366B2Active Publication Date: 2026-04-13REFINE HLDG CO LTD
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Patent Information

Application Number
JP2023009585
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2023-01-25
Publication Date
2026-04-13
Estimated Expiration
2041-06-04

AI Technical Summary

Technical Problem

Existing methods for dehydrating carbonaceous material dispersions in all-solid-state lithium-ion secondary batteries are inefficient, requiring large amounts of adsorbents and long processing times, and can degrade the solid electrolyte, leading to reduced battery performance.

Method used

A method involving the use of dry inert gas to evaporate moisture from carbonaceous material dispersions at controlled temperatures and pressures, with specific gas flow rates and bubble sizes, effectively removing water without affecting the dispersion's stability.

Benefits of technology

This method achieves rapid and efficient dehydration to low moisture levels, maintaining dispersion stability and improving battery performance by suppressing electrolyte degradation, enabling high-concentration and uniform dispersion of carbonaceous materials.

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Abstract

To provide a production method of a carbonaceous material dispersion for removing moisture easily and quickly from a carbonaceous material dispersion without deterioration of stability of the dispersion.SOLUTION: There is provided a production method of a carbonaceous material dispersion in which carbonaceous material particles are dispersed in an organic dispersion medium, the method comprising: a step for adding the carbonaceous material particles into the organic dispersion medium and dispersing the particles for forming a carbonaceous material dispersion, then blowing a dry inert gas into the dispersion whose temperature is held to 20-120°C for bringing the dispersion into contact with the dry inert gas for evaporating moisture in the dispersion.SELECTED DRAWING: Figure 1
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