Few-layer V 2 C/MWCNT with high ionic accessibility for lithium-ion storage

• Published in: Dalton transactions : an international journal of inorganic chemistry 2024-04, Vol.53 (16), p.7123-7130
• Main Authors: Fu, Shouchao, Zhang, Xunpeng, Wu, Bingxian, Zhang, Zhiguo, Gao, Hong, Li, Lu
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/D3DT04220K

A V C MXene has a high theoretical capacity and low diffusion barrier, showing tremendous potential in lithium-ion batteries. However, most reports on V C focus on a multilayered structure that is stacked, which diminishes the ionic accessibility and results in unsatisfactory cycling stability. Therefore, we synthesized a few-layer V C (f-V C) material and added multi-walled carbon nanotubes (MWCNTs). The formed f-V C/MWCNT provides abundant pores, which enhance ionic accessibility, so that Li can easily enter the layer space. The introduction of MWCNTs can further separate the f-V C, expand the specific surface area, reduce the charge transfer resistance, and heighten the structural stability. The experiments reveal that f-V C/MWCNT has a high specific capacity of 531 mA h g at 0.1 A g after 100 cycles. Even at a high current density of 5.0 A g , the specific capacity can still reach 166 mA h g . Moreover, the f-V C/MWCNT structure shows good cycling stability with a capacity retention rate of 95% after 1000 cycles at 5.0 A g . The above findings indicate that f-V C/MWCNT has great application potential in the field of Li storage.