Flexible and free‐standing La <sub>0.33</sub> Ti <sub>2</sub> (PO <sub>4</sub> ) <sub>3</sub> /C nanofibers film as a novel high‐performance anode for sodium‐ and potassium‐ion batteries
Jing Dai, Jian Jing, Jianping Yang, Wen Zhang, Shaoxiong Liu, Qianfu Wang, Jiaxing Wen, Hai Hu, Huifang Li, Li Liu
Abstract
Abstract Na superionic conductor (NASICON)‐type La 0.33 Ti 2 (PO 4 ) 3 (LaTP) is firstly proposed as sodium/potassium storage materials. The density functional theory (DFT) calculations show that LaTP has good electronic character and low Na + /K + migration barriers. The flexible La 0.33 Ti 2 (PO 4 ) 3 /C nanofiber film is synthesized via electrostatic spinning and investigated as free‐standing electrode applied to sodium‐ion batteries (SIBs) and potassium‐ion batteries (PIBs) in this work. The low band gap and Na + /K + migration barriers of LaTP, unique morphology, and complete conductive carbon net allow the La 0.33 Ti 2 (PO 4 ) 3 /C nanofibers film to deliver high capacity (296.3 mAh·g −1 for SIBs and 235.8 mAh·g −1 for PIBs), excellent rate performance (142.5 mAh·g −1 for SIBs and 50.5 mAh·g −1 for PIBs at 1.00 A·g −1 ), and superior cyclability above 1000 cycles. The full‐cell tests show that the material has a good application prospect, indicating a promising flexible anode material for SIBs and PIBs.