Affiliation:
1. College of Physics the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry International Center of Future Science Jilin University Changchun 130012 P. R. China
2. State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 P. R. China
3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
Abstract
AbstractHigh energy density and flexible electrodes, which have high mechanical properties and electrochemical stability, are critical to the development of wearable electronics. In this work, a free‐standing MXene bonded SnS2 composited nitrogen‐doped carbon fibers (MXene/SnS2@NCFs) film is reported as a flexible anode for sodium‐ion batteries. SnS2 nanoparticles with high‐capacity properties are covalently decorated in bio‐derived nitrogen‐doped 1D carbon fibers (SnS2@NCFs) and further assembled with highly conductive MXene sheets. The addition of bacterial cellulose (BC) can further improve the flexibility of the film. The unique 3D structure of points, lines, and planes can not only offset the disadvantage of low conductivity of SnS2 nanoparticles but also expand the distance between MXene sheets, which is conducive to the penetration of electrolytes. More importantly, the MXene sheets and N‐doped 1D carbon fibers (NCFs) can accommodate the large volume expansion of SnS2 nanoparticles and trap polysulfide during the cycle. The MXene/SnS2@NCFs film exhibits better sodium storage and excellent rate performance compared to the SnS2@NCFs. The in situ XRD and ex situ (XRD, XPS, and HRTEM) techniques are used to analyze the sodiation process and to deeply study the reaction mechanism of the films. Finally, the quasi‐solid‐state full cells with MXene/SnS2@NCFs and Na3V2(PO4)3@carbon cloth (NVP@CC) fully demonstrate the application potential of the flexible electrodes.
Funder
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry