Temperature-dependent synthesis of SnO2 or Sn embedded in hollow porous carbon nanofibers toward customized lithium-ion batteries

• Published in: Science China materials Vol. 66; no. 5; pp. 1736 - 1746
• Main Authors: Liang, Fanghua, Dong, Huilong, Ji, Zhuyu, Zhang, Wei, Zhang, Haifeng, Cao, Chunyan, Li, Heng, Liu, Hongchao, Zhang, Ke-Qin, Lai, Yuekun, Tang, Yuxin, Ge, Mingzheng
• Format: Journal Article
• Language: English
• Published: Beijing Science China Press 01.05.2023; Springer Nature B.V
• Subjects: Anodes; Carbon fibers; Carrier transport; Charging; Chemistry and Materials Science; Chemistry/Food Science; Current carriers; Customization; Electric vehicles; Electrode materials; Electrodes; Electron transport; Electronic devices; Energy storage; Hybrid electric vehicles; Ion diffusion; Ion storage; Lithium-ion batteries; Materials Science; Nanoclusters; Nanofibers; Portable equipment; Rechargeable batteries; Storage systems; Temperature dependence; Tin dioxide; Sn-based electrodes; lithium-ion batteries; large energy storage; high rate performance; volume expansion
• ISSN: 2095-8226; 2199-4501
• DOI: 10.1007/s40843-022-2301-y

Lithium-ion batteries (LIBs) have been widely used as grid-level energy storage systems to power electric vehicles, hybrid electric vehicles, and portable electronic devices. However, it is a big challenge to develop high-capacity electrode materials with large energy storage and ultrafast charging capability simultaneously due to the sluggish charge carrier transport in bulk materials and fragments of active materials. To address this issue, composite electrodes of SnO 2 nanodots and Sn nanoclusters embedded in hollow porous carbon nanofibers (denoted as SnO 2 @HPCNFs and Sn@HPCNFs) were respectively constructed programmatically for customized LIBs. Highly interconnected carbon nanofiber networks served as fast electron transport pathways. Additionally, the hierarchical hollow and porous structure facilitated rapid Li-ion diffusion and alleviated the volume expansion of Sn and SnO 2 . SnO 2 @HPCNFs delivered a remarkably high capacity of 899.3 mA h g −1 at 0.1 A g −1 due to enhanced Li adsorption and high ionic diffusivity. Meanwhile, Sn@HPCNFs displayed fast charging capability and superior high rate performance of 238.8 mA h g −1 at 5 A g −1 (∼10 C) due to the synergetic effect of enhanced Li-ion storage in the bulk pores of Sn and improved electronic conductivity. The investigation of the electrochemical behaviors of SnO 2 and Sn by tailoring the carbonization temperature provides new insight into constructing high-capacity anode materials for high-performance energy storage devices.