A capsule-structured hard carbon material for sodium-ion batteries and a preparation method and application thereof

By constructing capsule-structured hard carbon materials, the problem of difficult control of the micropore structure of hard carbon materials in sodium-ion batteries was solved, and the synergistic optimization of high sodium storage capacity and long cycle stability was achieved.

CN122102098APending Publication Date: 2026-05-29HUNAN JIDIAN SPECIAL ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN JIDIAN SPECIAL ENERGY TECHNOLOGY CO LTD
Filing Date
2026-02-02
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing hard carbon materials in sodium-ion batteries have a microporous structure that is difficult to precisely control, resulting in a high specific surface area that triggers interfacial side reactions, reducing initial coulombic efficiency and cycle stability.

Method used

Graphene mesoporous sponge material was prepared by chemical vapor deposition. By mixing it with resin material and adding a curing agent, a capsule-structured hard carbon material was constructed. The dense resin carbon shell blocked the direct contact between the electrolyte and the internal GMS, while retaining the rich closed-pore structure inside the GMS as sodium ion storage sites.

Benefits of technology

It effectively suppressed interfacial side reactions, improved the long-cycle stability and rate performance of sodium-ion batteries, and maintained high sodium storage capacity.

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Abstract

The application discloses a capsule-structured hard carbon material for sodium ion batteries and a preparation method and application thereof. The prepared capsule-structured hard carbon material has excellent sodium storage performance. The hard carbon material with a capsule structure is prepared based on a liquid phase hole sealing technology, GMS material is encapsulated in a resin-based hard carbon matrix, and a capsule structure with a GMS core and a resin carbon shell is constructed. The capsule structure effectively blocks the direct contact between electrolyte and the internal GMS by using the dense resin carbon shell, and fundamentally inhibits the interface side reaction caused by the high specific surface area. The rich closed pore structure in the GMS is fully retained and utilized as a sodium ion storage site, so that the long cycle stability and the rate property of the hard carbon negative material in the full battery application are improved under the premise of ensuring the high sodium storage capacity of the hard carbon negative material.
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