Preparation method of ficus microcarpa aerial root derived hard carbon and application of ficus microcarpa aerial root derived hard carbon in battery negative electrode

By preparing multi-level porous hard carbon materials using the aerial roots of banyan trees, the performance limitations of hard carbon materials in sodium-ion batteries have been solved, achieving high capacity and stability while reducing preparation costs and environmental impact.

CN122126824APending Publication Date: 2026-06-02FUJIAN AGRI & FORESTRY UNIV
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Patent Information

Application Number
CN202610045800.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-14
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing hard carbon materials suffer from poor rate performance and poor long-term cycle stability in sodium-ion batteries. Furthermore, traditional preparation methods are cumbersome or costly, and there is a lack of research on environmentally friendly biomass materials.

Method used

Using the aerial roots of banyan trees as raw materials, a hard carbon material with a multi-level pore and fiber-based sheet composite structure was prepared by lignin removal treatment with a low eutectic solvent (DES), followed by calcination at medium-low and medium-high temperatures and acid washing.

Benefits of technology

This study achieves high specific capacity, good rate performance, and long-term cycle stability in hard carbon materials, while reducing preparation costs and environmental impact, making them suitable as anode materials for sodium-ion batteries.

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Abstract

The invention discloses a ficus microcarpa aerial root derived hard carbon preparation method, and belongs to the technical field of new energy materials, and the method comprises the following steps: 1, cleaning and drying fresh cut ficus microcarpa aerial roots, crushing, and screening; 2, choline chloride (ChCl) and lactic acid (LA) are mixed in proportion to prepare DES; 3, the DES in the step 2 and the ficus microcarpa aerial root powder in the step 1 are mixed and reacted, then delignification is conducted, black liquor obtained after delignification treatment is washed with absolute ethyl alcohol and deionized water, suction filtration is conducted, a filter cake is obtained, and the filter cake is dried with a drying oven; 4, grinding the filter cake in the step 3 into powder, and calcining at medium and low temperatures to obtain banyan aerial root pre-carbonized powder; and step 5, calcining the pre-carbonized powder in the step 4 at medium and high temperature, pickling and drying to obtain the ficus microcarpa aerial root derivative hard carbon. The invention discloses a preparation method of the derivative hard carbon which is green, environment-friendly and excellent in performance, the derivative hard carbon is applied to a battery negative electrode material, and high-valued utilization of biomass wastes is realized.
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