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Lu, Chengxing; Li, Xingyu; Liu, Ronghui; Niu, Hua‐Jie; Wang, Qingyan; Xiao, Tingjiao; Liu, Jianjun; Wang, Hua; Zhou, Wei
Advanced functional materials, May 8, 2023, Letnik: 33, Številka: 19Journal Article
To develop quick‐charge sodium‐ion battery, it is significant to optimize insertion‐type anode to afford fast Na+ diffusion rate and excellent electron conductivity. First‐principles calculations reveal the TiO subcompound superiority for Na+ diffusion following Ti(II)O > Ti(III)O > Ti(IV)O. Hence, in situ growth of amorphous TiO subcompounds with rich oxygen defects based on Ti3C2Tx‐MXene is developed. Meanwhile, the composite presents expanded MXene interlayer spacing and much enhanced conductivity. The synergistic effect of enhanced electron/ion conduction gives a high capacity of 107 mAh g−1 at 50 A g−1, which gives 50% and 150% increasements compared with one counterpart without valence adjustment and another one without MXene expansion. It only needs 20 s (at 30 A g−1) to complete the discharge/charge process and obtains a capacity of 144.5 mAh g−1, which also shows a long‐term cycling stability at quick‐charge mode (121 mAh g−1 after 10000 cycles at 10 A g−1). The enhanced performance comes from fast electron transfer among TiO subcompounds contributed by rich‐defect amorphous TiO2–x, and a reversible change of elastic MXene with interlayer spacing between 1.4 and 1.9 nm during Na+ insertion/extraction process. This study provides a feasible route to boost the kinetics and develop quick‐charge sodium‐ion battery. The composite of elastic S‐doped Ti3C2Tx MXene with 18.2% expanded interlayer spacing and amorphous TiO2–x gives a specific capacity of 121 mAh g−1 at 10 A g−1 after 10 000 cycles, showing great potential in developing functional fast‐charge sodium‐ion batteries. The fast Na+ storage kinetic process and stability comes from optimized insertion‐type MXene and fast electron transfer among TiO subcompounds.
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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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