Porous carbon, positive electrode additive for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and method for producing porous carbon

The use of porous carbon with tailored pore structure and density in the positive electrode of non-aqueous electrolyte secondary batteries addresses the limitations of existing additives, enhancing lithium ion mobility and electrode strength, thereby improving battery performance.

JP7783882B2Active Publication Date: 2025-12-10KURARAY CO LTD
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Patent Information

Application Number
JP2023525856
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-06-01
Filing Date
2022-05-31
Publication Date
2025-12-10
Estimated Expiration
2042-05-31

AI Technical Summary

Technical Problem

Existing positive electrode additives for non-aqueous electrolyte secondary batteries, such as activated carbon and Ketjen black, fail to sufficiently improve input/output characteristics at room temperature and often impair the dispersibility of the electrode slurry, and the dispersibility of the electrode peel strength, due to the adsorption of the binder, and the aggregation of the conductive agent, making it difficult to ensure the peel strength of the resulting electrode.

Method used

A porous carbon with specific physical properties, including a pore volume of 0.8 cm³/g for pores between 2 nm and 200 nm, a bulk density of 0.10 g/cm³ or less, and a mode diameter of 150 nm or less, is added to the positive electrode, ensuring interconnected pore structure and flaky shape, which enhances lithium ion storage and mobility, improving input/output characteristics and electrode peel strength.

Benefits of technology

The porous carbon effectively improves the input/output characteristics of non-aqueous electrolyte secondary batteries at room temperature by ensuring abundant lithium ion supply and retention, while maintaining the electrode's peel strength through interconnected pore structure and flaky shape, preventing binder adsorption and electrode chipping.

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Abstract

The purpose of the present invention is to provide a porous carbon that is suitable for a positive electrode additive and can improve the input / output characteristics of a non-aqueous electrolyte secondary battery at room temperature and ensure the peel strength of an electrode.　The present invention relates to a porous carbon that has a 2–200 nm pore volume of at least 0.8 cm3 / g as measured by BJH analysis, a bulk density of no more than 0.10 g / cm3, a mode pore size of no more than 150 nm as measured by BJH analysis, and an average primary particle size of 1–100 μm.
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Citation Information

Patent Citations

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  • Nonaqueous lithium type storage element

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    JP2017050184A

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    JP4727386B2

  • Nonaqueous lithium-type storage element

    WO2009063966A1