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- Title
Mechanically flexible V<sub>3</sub>S<sub>4</sub>@carbon composite fiber as a high-capacity and fast-charging anode for sodium-ion capacitors.
- Authors
Mao, Zhi-Fei; Shi, Xiao-Jun; Zhang, Tao-Qiu; Liang, Peng-Ju; Wang, Rui; Jin, Jun; He, Bei-Bei; Gong, Yan-Sheng; Wang, Qiang; Tong, Xi-Li; Wang, Huan-Wen
- Abstract
Hybrid Na-ion capacitors (NICs) have received considerable interests owing to their low-cost, high-safety, and rapidly charging energy-storage characteristics. The NICs are composed of a capacitor-type cathode and a battery-type anode. The major challenge for NICs is to search for suitable electrode materials to overcome the sluggish diffusion of Na+ in the anode. Herein, ultrafine vanadium sulfide is encapsulated in carbon fiber (V3S4@CNF) as a self-supported electrode by electrospinning and in situ sulfurization. The carbon cladding and one-dimensional (1D) nanofiber network-like structure could alleviate the volume expansion of V3S4 during Na+ de-/intercalation process. Consequently, the V3S4@CNF anode exhibited a pseudocapacitive sodium storage in terms of large Na+-storage capacity (476 mAh·g−1 at 0.1 A·g−1), high-rate capability (290 mAh·g−1 at 20.0 A·g−1) and excellent cycling stability (95% capacity retention for 1500 cycles at 2.0 A·g−1) in Na half-cells. By employing V3S4@CNF as the anode and the activated carbon (AC) cathode, the as-assembled NICs could deliver a high energy density of 110 Wh·kg−1 at a power density of 200 W·kg−1. Even at a high power of 10,000 W·kg−1, the specific energy is still up to 42 Wh·kg−1.
- Publication
Rare Metals, 2023, Vol 42, Issue 8, p2633
- ISSN
1001-0521
- Publication type
Article
- DOI
10.1007/s12598-023-02269-1