3D hydroxylated MXene/carbon nanotubes composite as scaffold for dendrite-free sodium-metal electrode

Angewandte Chemie
Xin HeJun Chen

Abstract

Sodium metal is a promising anode, but the uneven Na deposition with a dendrite growth seriously impedes its application. Herein, a fibrous hydroxylated MXene/carbon nanotubes (h-Ti 3 C 2 /CNTs) composite is designed as a scaffold for dendrite-free Na metal electrode. This composite displays fast Na + /electron transport kinetics, satisfied thermal conductivity and mechanical property. The h-Ti 3 C 2 contains abundant sodiophilic functional groups, which play a significant role in inducing homogeneous nucleation of Na. Meanwhile, CNTs provide high tensile strength and ease film-forming. As a result, h-Ti 3 C 2 /CNTs exhibit a high average Coulombic efficiency of 99.2% and no dendrite after 1000 cycles. The h-Ti 3 C 2 /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-O 2 batteries with h-Ti 3 C 2 /CNTs/Na anode exhibit a low potential gap of 0.11 V after an initial 70 cycles. This work paves the way to construct stable Na anode by hydroxylated MXene materials.

References

Aug 24, 2011·Advanced Materials·Michael NaguibMichel W Barsoum
Apr 18, 2013·Nature Communications·Olha MashtalirYury Gogotsi
Apr 19, 2016·Angewandte Chemie·Xiaofei HuJun Chen
May 11, 2016·ACS Central Science·Zhi Wei SehYi Cui
Jan 24, 2017·Advanced Materials·Shuya WeiLynden A Archer
Jun 20, 2017·Angewandte Chemie·Prasant Kumar NayakPhilipp Adelhelm
Aug 7, 2017·Angewandte Chemie·Aoxuan WangJiayan Luo
Nov 18, 2017·Chemical Communications : Chem Comm·Yanying LuJun Chen
Jun 2, 2018·Advanced Materials·Bing SunGuoxiu Wang
Sep 11, 2018·Angewandte Chemie·Xinyue ZhangJiayan Luo

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Citations

Oct 20, 2020·Angewandte Chemie·Shuo ZhaoJun Chen
Jul 17, 2021·Chemical Communications : Chem Comm·Yinhui YiGangbing Zhu

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