Affiliation:
1. School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 China
2. Guangdong Engineering Technology Research Centre of Advanced Insulating Coating South China University of Technology-Zhuhai Institute of Modern Industrial Innovation Zhuhai 519175 China
3. School of Materials Engineering Guangdong Technion-Israel Institute of Technology Shantou 515000 China
4. School of Environment and Energy South China University of Technology Guangzhou 510640 China
Abstract
AbstractConsidering the extensive resources, flexible structural designability, and abundant active sites, organic electrodes have been considered as the ideal sodium storage materials. However, organic materials generally face the limitations of unstable and dissolved characteristic, leading to a poor cyclic stability. In this work, we proposed a carbon nanotube (CNT) modified polyimide as the anode for sodium‐based dual‐ion battery (SDIB). The polyimide remains well the structure and morphology of monomer with a stable conjugated structure and high degree of crystallinity, effectively enhancing the electrochemical performance of the SDIBs. Also, the cooperation with CNT particularly improves the ion conductivity of the anode and advances the rate performance. Combined with an ionic liquid electrolyte, the constructed dual‐ion battery exhibits excellent rate capability, high specific discharge capacity and stable cycling performance. It delivers a specific discharge capacity of 119.3 mA h g−1 at 0.2 C (1 C=100 mA g−1) and still has a specific discharge capacity of 82.3 mA h g−1 even after 1000 cycles at 10 C. Besides, the system displays a low self‐discharge rate and stable fast charging performance, which is expected to be applied in the large‐scale electrochemical energy storage devices and inspire the future development of SDIBs.
Funder
National Natural Science Foundation of China
Subject
General Energy,General Materials Science,General Chemical Engineering,Environmental Chemistry