Bean Pod‐Like SbSn/N‐Doped Carbon Fibers toward a Binder Free, Free‐Standing, and High‐Performance Anode for Sodium‐Ion Batteries. Issue 21 (2nd May 2022)

• Record Type: Journal Article
• Authors: Dang, Jie; Zhu, Ruiyu; Zhang, Shengqiang; Yang, Lijie; Chen, Xin; Wang, Hui; Liu, Xiaojie
• Is Part Of: Small. Volume 18:Issue 21(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-02
• Subjects: electrospinning -- free‐standing anodes -- N‐doped carbons -- SbSn alloys -- sodium‐ion batteries; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202107869
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Bimetallic SbSn alloy stands out among the anode materials for sodium‐ion batteries (SIBs) because of its high theoretical specific capacity (752 mAh g −1 ) and good electrical conductivity. However, the major challenge is the large volume change during cycling processes, bringing about rapid capacity decay. Herein, to cope with this issue, through electrostatic spinning and high temperature calcination reduction, the unique bean pod‐like free‐standing membrane is designed initially, filling SbSn dots into integrated carbon matrix including hollow carbon spheres and nitrogen‐doped carbon fibers (B‐SbSn/NCFs). Significantly, the synergistic carbon matrix not only improves the conductivity and flexibility, but provides enough buffer space to alleviate the large volume change of metal particles. More importantly, the B‐SbSn/NCFs free‐standing membrane can be directly used as the anode without polymer binder and conductive agent, which improves the energy density and reaction kinetics. Satisfyingly, the free‐standing BSbSn/NCFs membrane anode shows excellent electrochemical performance in SIB. The specific capacity of the membrane electrode can maintain 486.9 mAh g −1 and the coulombic efficiency is close to 100% after 400 cycles at 100 mA g −1 . Furthermore, the full cell based on B‐SbSn/NCFs anode also exhibits the good electrochemical performance. Abstract : Bean pod‐like SbSn/N‐doped carbon fibers formed by oversimplified electrospinning technique can be directly used as the free‐standing flexible anode and can present excellent reversible capacity for sodium storage. Benefiting from the binder‐free characteristic, the manufacturing process is simplified and the energy density of the battery is improved. The designed flexible anode exhibits great potential in practical applications.