SnO2 nanosheets grown on in-situ formed N-doped branched TiO2/C nanofibers as binder-free anodes for sodium-ion storage. (10th April 2022)

• Record Type: Journal Article
• Authors: Wang, Ling; Lin, Changzheng; Yang, Guorui; Wang, Ning; Yan, Wei
• Is Part Of: Electrochimica acta. Volume 411(2022)
• Publication Date: 2022-04-10
• Subjects: SnO2 nanosheet -- Branched TiO2/C nanofiber -- Anode -- Sodium-ion battery -- Binder-free; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2022.140049
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: SnO2 nanosheets grown on in-situ formed N-doped branched TiO2 /C NFs are prepared. NBT/C@SnO2 NFs endow structural stability and fast electrons/ions transportation. The composites show high capacity and cycling stability for sodium storage. Abstract: SnO2 is considered as a promising anode material for sodium-ion storage. However, the low electrical conductivity and large volume expansion during repeated cycling process hinder its practical application. To address these issues, we designed a hybrid structure in which SnO2 nanosheets were grown on in-situ formed N-doped branched TiO2 /C nanofibers (NBT/C@SnO2 NFs). This unique design can improve the conductivity and structural stability of the electrode, provide enough space for volume expansion, and accelerate the transfer rate of electrons and ions, thereby enhancing the electrochemical performance. As a result, when directly used as an anode for sodium-ions batteries, the binder-free NBT/C@SnO2 NFs electrode exhibits outstanding cycling stability, with a reversible discharge capacity of 420.7 mA h g −1 after 500 cycles at 200 mA g −1 and still achieves 330.6 mA h g − 1 at a very high current density of 2000 mA g −1 . This work provides a novel strategy for the design of electrode materials for other high-performance battery systems. Graphical abssract: Image, graphical abstract