A sulfonic acid-based organic polymer, a sulfonic acid-based organic polymer / carbon nanotube composite material, and a preparation method and application thereof

By using sulfonic acid-based organic polymers and carbon nanotube composite materials, the problems of low capacity and poor cycle stability of lithium-ion battery cathode materials have been solved, achieving high capacity and long-term stability, and improving the performance of lithium-ion batteries.

CN118994576BActive Publication Date: 2026-06-12CHANGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGZHOU UNIV
Filing Date
2024-08-09
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Traditional lithium-ion battery cathode materials suffer from low capacity, poor cycle stability, and the environmental pollution caused by inorganic materials. Existing organic materials have low conductivity and high solubility, which limits the commercial application of lithium-ion batteries.

⚗Method used

A sulfonic acid-based organic polymer and carbon nanotube composite material was synthesized by a solvothermal method, and then in situ compounded with carbon nanotubes to form a sulfonic acid-based organic polymer/carbon nanotube composite material, which was applied to the cathode material of lithium-ion batteries.

🎯Benefits of technology

The specific capacity and cycle stability of lithium-ion batteries were improved. The sulfonic acid-based organic polymer/carbon nanotube composite material had an initial capacity of 216.3 mAh g-1 at 0.05 A g-1 and high capacity retention after long cycles. It overcame the dissolution problem of organic materials and improved the conductivity.

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Abstract

This invention belongs to the technical field of lithium-ion battery cathode materials, specifically relating to a sulfonic acid-based organic polymer, a sulfonic acid-based organic polymer / carbon nanotube composite material, its preparation method, and its application. The sulfonic acid-based organic polymer is prepared by a dehydration condensation reaction of 2,5-diaminobenzenesulfonic acid and hexaazabenzophenanthrene hexacarboxylic acid trianal. When used as a lithium-ion battery cathode material, it exhibits high specific capacity and excellent cycle stability, overcoming the solubility problem of organic cathode materials in electrolytes. When the sulfonic acid-based organic polymer is combined with carbon nanotubes and applied to lithium-ion battery cathode materials, battery performance is significantly improved, and the capacity remains stable even after long-term cycling. The synthesis methods of the sulfonic acid-based organic polymer and the sulfonic acid-based organic polymer / carbon nanotube composite material of this invention are simple, have abundant raw material sources, and good reproducibility, making them suitable for industrial production and possessing broad application prospects in the field of lithium-ion batteries.
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