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Bifunctional effect of laser-induced nucleation-preferable microchannels and in situ formed LiF SEI in MXenes for stable lithium-metal batteries

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Abstract

Lithium (Li) metal is considered to be the ultimate choice of anode for high energy density lithium-based batteries. However, the uncontrollable dendrite growth, in particular at large current rates, hinders its practical applications. Herein, a novel MXene/TiO2 membrane with aligned microchannels as the lithium host is fabricated using a femtosecond laser, with numerous lithiophilic sites (TiO2) spatial-precisely synthesized on the channel walls. Benefiting from the exposed nanometer-scale edges of the MXene, a favorable Li+ ion migration into the channels is achieved by the well-manipulated electric field, thus resulting in preferential Li deposition inside the microchannels. Moreover, a lithium fluoride (LiF) reinforced SEI is generated on the top surface of the host upon electrochemical cycling thanks to the built-in fluorine terminals in the MXene. As a result, a long lifespan of 750 cycles (1500 hours) with a coulombic efficiency of 98.8% is achieved at 1 mA cm−2. Even at an ultrahigh current density of 20 mA cm−2, a lifespan of 500 cycles with a coulombic efficiency of 95.9% is still delivered.

Graphical abstract: Bifunctional effect of laser-induced nucleation-preferable microchannels and in situ formed LiF SEI in MXenes for stable lithium-metal batteries

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Supplementary files

Article information


Submitted
23 Apr 2020
Accepted
10 Jun 2020
First published
10 Jun 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Bifunctional effect of laser-induced nucleation-preferable microchannels and in situ formed LiF SEI in MXenes for stable lithium-metal batteries

C. Xiong, Z. Wang, X. Peng, Y. Guo, S. Xu and T. Zhao, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/D0TA04302H

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