期刊
ACS NANO
卷 13, 期 12, 页码 14308-14318出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b07710
关键词
MXene; Li-metal anode; 3D framework; dendrite-free; graphene
类别
资金
- National Key R@D Program of China [2016YBF0100100, 2016YFA0200200]
- National Natural Science Foundation of China [51572259, 51872283, 21805273]
- LiaoNing Revitalization Talents Program [XLYC1807153]
- Natural Science Foundation of Liaoning Province [20180510038]
- DICP [DICP ZZBS201708, DICP ZZBS201802, DICPQIBEBT UN201702]
- QIBEBT [DICPQIBEBT UN201702]
- Dalian National Laboratory For Clean Energy (DNL), CAS
- DNL Cooperation Fund, CAS [DNL180310, DNL180308, DNL201912]
- China Post-doctoral Science Foundation [2018M631831, 2018M633497]
- Fundamental Research Funds for the Central Universities of China [N180503012]
Li-metal anode is widely acknowledged as the ideal anode for high-energy-density batteries, but seriously hindered by the uncontrollable dendrite growth and infinite volume change. Toward this goal, suitable stable scaffolds for dendrite-free Li anodes with large current density (>5 mA cm-2) and high Li loading (>90%) are highly in demand. Herein, a conductive and lithiophilic three-dimensional (3D) MXene/graphene (MG) framework is demonstrated for a dendrite-free Li-metal anode. Benefiting from its high surface area (259 m(2) g(-1)) and lightweight nature with uniformly dispersed lithiophilic MXene nanosheets as Li nucleation sites, the as-formed 3D MG scaffold showcases an ultrahigh Li content (similar to 92% of the theoretical capacity), as well as strong capabilities in suppressing the Li-dendrite formation and accommodating the volume changes. Consequently, the MG -based electrode exhibits high Coulombic efficiencies (similar to 99%) with a record lifespan up to 2700 h and is stable for 230 cycles at an ultrahigh current density of 20 mA cm(-2). When coupled with Li4'115012 or sulfur, the MG-Li/Li4Ti5O12 full-cell offers an enhanced capacity of 142 mAh g(-1) after 450 cycles, while the MG-Li/sulfur cell delivers an improved rate performance, implying the great potential of this 3D MG framework for building long-lifetime, high-energy-density batteries.
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