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He, Xin; Jin, Song; Miao, Licheng; Cai, Yichao; Hou, Yunpeng; Li, Haixia; Zhang, Kai; Yan, Zhenhua; Chen, Jun
Angewandte Chemie International Edition, September 14, 2020, Letnik: 59, Številka: 38Journal Article
Sodium metal is a promising anode, but uneven Na deposition with a dendrite growth seriously impedes its application. Herein, a fibrous hydroxylated MXene/carbon nanotubes (h‐Ti3C2/CNTs) composite is designed as a scaffold for dendrite‐free Na metal electrodes. This composite displays fast Na+/electron transport kinetics and good thermal conductivity and mechanical properties. The h‐Ti3C2 contains abundant sodiophilic functional groups, which play a significant role in inducing homogeneous nucleation of Na. Meanwhile, CNTs provide high tensile strength and ease of film‐forming. As a result, h‐Ti3C2/CNTs exhibit a high average Coulombic efficiency of 99.2 % and no dendrite after 1000 cycles. The h‐Ti3C2/CNTs/Na based symmetric cells show a long lifespan over 4000 h at 1.0 mA cm−2 with a capacity of 1.0 mAh cm−2. Furthermore, Na‐O2 batteries with a h‐Ti3C2/CNTs/Na anode exhibit a low potential gap of 0.11 V after an initial 70 cycles. A friend to sodium: A fibrous hydroxylated h‐Ti3C2/carbon nanotubes composite is designed as a scaffold for dendrite‐free Na metal electrodes. It displays fast Na+/electron transport kinetics, high sodiophilicity, and satisfactory thermal conductivity and mechanical properties.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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