Preparation of biomass-based carbon / nickel-cobalt-aluminum composite electrode based on cation vacancies and application thereof in flexible devices

By preparing a biomass-based carbon/nickel-cobalt-aluminum composite electrode based on cation vacancies, the conductivity and stability problems of traditional electrode materials were solved, enabling the application of flexible devices with high specific capacitance and high energy density.

CN122136184APending Publication Date: 2026-06-02QINGDAO UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QINGDAO UNIV OF SCI & TECH
Filing Date
2026-04-17
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Traditional electrode material designs suffer from problems such as poor conductivity, easy agglomeration of nanosheets, and poor cycling stability, resulting in low energy density of supercapacitors. Existing composite strategies cannot effectively control the surface properties and electronic structure of materials, thus limiting their electrochemical performance.

Method used

Using biomass as the carbon source, a hierarchical porous carbon support was prepared by phosphoric acid activation, and a NiCoAl-LHs structure was grown in situ on its surface. Cation vacancies were constructed by alkaline etching to form a composite electrode material rich in cation vacancies, thereby improving the electrochemical performance of the material.

Benefits of technology

A composite electrode material with high specific capacitance and high energy density has been developed, exhibiting excellent cycle stability and flexibility, making it suitable for flexible devices.

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Abstract

A biomass-based carbon / nickel-cobalt-aluminum composite electrode based on cation vacancies is prepared and its application in flexible devices. The method is characterized by: using biomass as the carbon source, preparing hierarchical porous biomass-based carbon through phosphoric acid activation as a carrier, then growing a NiCoAl-LHs ternary layered structure in situ on the carbon carrier surface via solvothermal deposition, and finally achieving Al through alkaline etching. 3+ Selective dissolution was employed to construct a cation-vacancy-rich composite electrode material exhibiting both ultra-high specific capacitance and stability. Biomass char provided a conductive framework, constructed a hierarchical porous structure, and effectively suppressed LDH sheet aggregation; metallic Al... 3+ The introduction of [a specific technology / method] can enhance the structural stability of LDH; by utilizing the synergistic effect of carbon support and cation vacancies, the interlayer spacing of LDH can be increased, improving its resistance to OH [a specific substance / effect]. ‑ Increase adsorption capacity and accelerate the absorption of OH- in electrolytes ‑ The ion diffusion rate was high. The supercapacitor assembled using a constructed cation-vacancy-rich biomass-based carbon / nickel-cobalt-aluminum composite material as electrodes exhibited excellent specific capacitance, high energy density, and cycling stability. Furthermore, the fabricated device possesses excellent flexibility and sensitivity, showing broad application prospects in the sensor field.
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