A carbon-based composite structural material and a preparation method and application thereof

By preparing a carbon-based composite structure of graphite-like crystalline carbon and ordered pseudographite domain materials, the problem of irreversible capacity loss of graphite anode materials in sodium-ion batteries was solved, and a high-energy-density sodium-ion battery was realized.

CN117985689BActive Publication Date: 2026-06-09SUN YAT SEN UNIV
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SUN YAT SEN UNIV
Filing Date
2024-01-31
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing graphite anode materials cannot be used in sodium-ion batteries because sodium ions have a large radius and are difficult to embed between graphite layers, resulting in irreversible capacity loss and low initial coulombic efficiency, which limits the energy density of sodium-ion batteries.

Method used

By employing graphite-like crystalline carbon and ordered pseudographite domain materials, a carbon-based composite structure with an interlayer spacing of more than 0.37 nm is formed through low-temperature pyrolysis and high-temperature treatment of biomass in a closed graphite container. Graphite-like crystalline carbon is induced to grow using graphite seed crystals, thereby reducing defects and improving reversible capacity.

Benefits of technology

This study achieved high initial coulombic efficiency and reversible charge specific capacity in the low voltage plateau region of sodium-ion batteries, thereby improving the energy density of the entire battery and reducing costs.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure BDA0004692802980000101
    Figure BDA0004692802980000101
  • Figure HDA0004692803420000011
    Figure HDA0004692803420000011
  • Figure HDA0004692803420000012
    Figure HDA0004692803420000012
Patent Text Reader

Abstract

The application discloses a carbon-based composite structure material and a preparation method and application thereof. The carbon-based composite structure material comprises graphite-like crystal carbon. The preparation method of the carbon-based composite structure material comprises the following steps: S1, placing biomass in a closed graphite container and performing primary pyrolysis to obtain a carbon primary product; S2, removing impurities in the carbon primary product to obtain a carbon primary product with removed impurities, wherein the impurities include metal impurities and silicon impurities; and S3, placing the carbon primary product with removed impurities in a closed graphite container and performing secondary pyrolysis to obtain the carbon-based composite structure material. The carbon-based composite structure material prepared by the preparation method can be applied to a sodium ion battery, and can realize a first circle coulomb efficiency of 95.1%, a reversible charge specific capacity of 345.2 mAh / g, and a reversible charge specific capacity of 271.5 mA h / g in a 0.1V platform area.
Need to check novelty before this filing date? Find Prior Art