Journal
ACS NANO
Volume 13, Issue 10, Pages 11676-11685Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b05599
Keywords
Ti3C2Tx MXene@Zn paper; Zn metal anode; Li metal anode; dendrite suppression; free-standing
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Funding
- National Natural Science Foundation of China [21371108, 51972198]
- Taishan Scholars Program of Shandong Province [tsqn201812002]
- Shandong Provincial Science and Technology Key Project [2018GGX104002]
- State Key Program of National Natural Science of China [61633015]
- Project of the Taishan Scholar
- Young Scholars Program of Shandong University [2016WLJH03]
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Dendrite growth of metal anodes is one of the key hindrances for both secondary aqueous metal batteries and nonaqueous metal batteries. In this work, a freestanding Ti3C2Tx MXene@Zn paper is designed as both zinc metal anode and lithium metal anode host to address the issue. The binder-free Ti3C2Tx MXene@Zn paper exhibits merits of good mechanical flexibility, high electronic conductivity, hydrophilicity, and lithiophilicity. The crystal growth mechanism of Zn metal on common Zn foil and Ti3C2Tx MXene@Zn composite is also studied. It is found that the Ti3C2Tx MXene@Zn paper can effectively suppress the dendrite growth of Zn, enabling reversible and fast Zn plating/stripping kinetics in an aqueous electrolyte. Moreover, the Ti3C2Tx MXene@Zn paper can be used as a 3D host for a lithium metal anode. In this host, Zn is utilized as a nucleation agent to suppress the Li dendrite growth. The freestanding Ti3C2Tx MXene@Zn@Li anode exhibits superior reversibility with high Coulombic efficiency (97.69% over 600 cycles at 1.0 mA cm(-2)) and low polarization compared with the Cu@Li anode. These findings may be useful for the design of dendrite-free metal-based energy storage systems.
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