Method for producing a granular carbon-silicon composite from a lignin-silicon composite

By mixing and agglomerating lignin with silicon-containing materials and heat-treating the composite, the method addresses silicon loading and dispersion issues, achieving stable and scalable carbon-silicon composites for battery electrodes.

TWI931625BActive Publication Date: 2026-07-11STORA ENSO OYJ
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Patent Information

Application Number
TW111147272
Authority / Receiving Office
TW · TW
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-12-10
Filing Date
2022-12-08
Publication Date
2026-07-11
Estimated Expiration
2042-12-07

AI Technical Summary

Technical Problem

Existing methods for manufacturing carbon-silicon composites face challenges such as limited silicon loading, non-uniform dispersion, and processability issues due to lignin's thermoplastic behavior, which hinder their use in large-scale production and electrode performance.

Method used

A method involving mixing lignin powder with silicon-containing active materials, compacting, and agglomerating to form a lignin-silicon composite, followed by heat treatment to produce granular carbon-silicon composites with uniform silicon distribution, maintaining shape and size during thermal conversion.

Benefits of technology

The method enables high silicon loading and uniform dispersion in a carbon matrix, ensuring stable electrode performance and scalability for industrial production, avoiding deformation and swelling during heat treatment.

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Abstract

This invention relates to a method for manufacturing agglomerated lignin-silicon composite materials. The method includes the following steps: mixing lignin in powder form, at least one silicon-containing active material in powder form, and optionally at least one additive; compacting the mixture; and crushing the compacted composite material to obtain agglomerated lignin-silicon composite materials. This invention also relates to a granular carbon-silicon composite material obtained by heat-treating the agglomerated lignin-silicon composite material.
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