Anode material and method for preparing the same, and lithium-ion battery

A core-shell structured anode material with a silicon-based core and carbon-coated fibrous surface addresses conductivity and cycle rate issues in silicon-based anode materials, enhancing lithium-ion battery performance.

JP7875571B2Active Publication Date: 2026-06-18BTR NEW MATERIAL GRP CO LTD +1
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Patent Information

Application Number
JP2025530071
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2022-12-29
Filing Date
2023-09-13
Publication Date
2026-06-18
Estimated Expiration
2043-09-13

AI Technical Summary

Technical Problem

Conventional silicon-based anode materials for lithium-ion batteries face significant expansion and poor cycle rate performance due to insulating solid-electrolyte interphase (SEI) formation and limitations in conductivity when processed into powder materials.

Method used

A negative electrode material with a core-shell structure, comprising a silicon-based core coated with a carbon material and a fibrous material on the surface, where the fibrous material improves charge and mass transfer efficiency by forming high-speed lithium intercalation channels.

Benefits of technology

The proposed structure enhances the conductivity and cycle performance of the anode material by reducing charge transfer resistance and improving lithium conduction, suitable for large-scale industrialization.

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Abstract

The present invention relates to a negative electrode material and a preparation method thereof, and to a lithium ion battery. [Solution] The anode material comprises a core and a first coating layer covering at least a portion of the surface of the core, the core comprising a silicon-based material, the first coating layer comprising a carbon material, a fibrous material distributed on at least a portion of the surface of the first coating layer, and the fibrous material and the anode material satisfy the mathematical formula (I). The presence of the fibrous material on the surface of the first coating layer of the present invention allows the anode material to accept electrons and lithium ions at a high speed, improving the conductivity of the anode material and thereby improving the rate performance of the anode material. TIFF2025538257000009.tif17170 (In formula (I), D wire is the minimum fiber diameter (nm) of the fiber material, and D 10 is the particle size (nm) corresponding to when the cumulative particle size distribution number of the negative electrode material reaches 10%, and ρ is the powder conductivity (S / cm) of the negative electrode material.
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Citation Information

Patent Citations

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  • Anode material for lithium secondary battery and its manufacturing method

    JP2004349056A

  • Negative electrode material for nonaqueous electrolyte secondary battery, its manufacturing method, and nonaqueous secondary battery using it

    JP2007329001A