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Engineering Microstructure of a Robust Polymer Anode by Moderate Pyrolysis for High-Performance Sodium Storage
Jie Yan1, Xue-Ling Chen1, Yutao Cui1
1College of Chemistry and Materials Science and Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, People's Republic of China.
ACS Applied Materials & Interfaces
|October 26, 2022
Summary
Moderate pyrolysis of polymeric carbon nitride (PCN) enhances its conductivity and microstructure for high-performance sodium-ion batteries (NIBs), significantly improving energy storage capabilities.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Polymer anodes are attractive for sodium-ion batteries (NIBs) due to flexibility and sustainability.
- Challenges include slow kinetics, poor cyclability, and low conductivity, often requiring substantial conductive additives.
Purpose of the Study:
- To enhance the electronic conductivity and sodium-ion transport in polymer anodes.
- To improve the cycling stability and overall performance of polymer anodes for NIBs.
Main Methods:
- Moderate pyrolysis of polymeric carbon nitride (PCN) to tune its electronic and structural properties.
- Fabrication of electrodes using 10 wt % conductive carbon additive with the modified PCN.
- Electrochemical testing of the modified PCN as an anode in NIBs.
Main Results:
- Pyrolysis reduced the bandgap, enhancing electronic conductivity.
- Modified microstructures improved Na+ transfer and storage.
- Achieved high specific capacity (351 mAh g-1 at 0.1C), excellent rate capability (151 mAh g-1 at 10C), and stable cycling (88.5% retention after 6500 cycles at 2C).
Conclusions:
- Moderate pyrolysis is an effective strategy to design high-performance polymer anodes for NIBs.
- The modified PCN offers superior performance compared to existing organic counterparts.
- This work presents a new design pathway for advanced polymer anodes in energy storage applications.
