A method for preparing hard carbon negative electrode material based on double cross-linking reaction of organophosphoric acid and Schiff base and its application in sodium battery
The hard carbon negative electrode material is prepared by the double cross-linking reaction of organic phosphoric acid and Schiff base, which solves the problems of low reversible capacity, low first-cycle coulombic efficiency and poor rate performance of hard carbon negative electrode materials in sodium ion batteries, achieves efficient material improvement effect, and is suitable for large-scale production.
CN119898754BActive Publication Date: 2025-09-30HARBIN INST OF TECH
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Patent Information
- Application Number
- CN202510085915.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2045-01-20
AI Technical Summary
Technical Problem
Hard carbon negative electrode materials in sodium ion batteries have problems such as low reversible capacity, low first-cycle coulombic efficiency, and poor rate performance.
Method used
The hard carbon negative electrode material is prepared by the double cross-linking reaction of organic phosphoric acid and Schiff base. N/P elements are in situ doped in the biomass through the cross-linking effect of organic phosphonic acid and diamine compounds to form N/P co-doped hard carbon material.
Benefits of technology
The reversible capacity, initial coulombic efficiency and cycle stability of hard carbon materials are improved, the rate performance is enhanced, the operation is simple and suitable for large-scale production.
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Abstract
A method for preparing a hard carbon negative electrode material based on a double cross-linking reaction of organophosphoric acid and Schiff base and its application in sodium batteries, the method comprising the following steps: step 1, cross-linking biomass and organophosphoric acid with C-O-P bonds; step 2, converting the material obtained in the first step into aldehyde groups (-CHO) by oxidation with an oxidizing acid; step 3, secondary cross-linking the -CHO of the material obtained in the second step with the -NH2 in the diamine compound by Schiff base reaction; step 4, carbonizing the material obtained in the third step at high temperature in an inert atmosphere, and assembling it into a sodium ion battery after cooling. Compared with the prior art, the present invention has the following advantages: (1) the operation method is simple and reliable, takes less time, and does not require the use of high-end instruments. (2) the improvement efficiency is excellent and can be mass-produced.
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