Journal
ACS NANO
Volume 12, Issue 3, Pages 2381-2388Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b07672
Keywords
MXene; nanosheets; integrated electrode; flexible; lithium-sulfur batteries
Categories
Funding
- National Key R@D Program of China [2016YFA0200200, 2016YFB0100100]
- National Natural Science Foundation of China [51572259]
- Natural Science Foundation of Liaoning Province [201602737]
- Recruitment Program of Global Expert (1000 Talent Plan)
- DICP [DICP ZZBS201708]
- DICPQIBEBT [DICPQIBEBT UN201702]
- Dalian National Laboratory For Clean Energy (DNL)
- CAS
- China Postdoctoral Science Foundation [2016M601349, 2017T100188]
- Exploratory Research Program of Shaanxi Yanchang Petroleum (Group) Co., LTD
- DICP
- DICP Outstanding Postdoctoral Foundation [2016YB06]
- dedicated funds for methanol conversion from DICP
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High-energy-density lithium-sulfur (Li-S) batteries hold promise for next-generation portable electronic devices, but are facing great challenges in rational construction of high-performance flexible electrodes and innovative cell configurations for actual applications. Here we demonstrated an all-MXene-based flexible and integrated sulfur cathode, enabled by three-dimensional alkalized Ti3C2 MXene nanoribbon (a-Ti3C2 MNR) frameworks as a S/polysulfides host (a-Ti3C2-S) and two-dimensional delaminated Ti3C2 MXene (d-Ti3C2) nano-sheets as interlayer on a polypropylene (PP) separator, for high-energy and long-cycle Li-S batteries. Notably, an a-Ti3C2 MNR framework with open interconnected macropores and an exposed surface area guarantees high S loading and fast ionic diffusion for prompt lithiation/delithiation kinetics, and the 2D d-Ti3C2 MXene interlayer remarkably prevents the shuttle effect of lithium polysulfides via both chemical absorption and physical blocking. As a result, the integrated a-Ti3C2-S/d-Ti3C2/PP electrode was directly used for Li-S batteries, without the requirement of a metal current collector, and exhibited a high reversible capacity of 1062 mAh g(-1) at 0.2 C and enhanced capacity of 632 mAh g(-1) after 50 cycles at 0.5 C, outperforming the a-Ti3C2-S/PP electrode (547 mAh g(-1)) and conventional a-Ti3C2-S on an Al current collector (a-Ti3C2-S/Al) (597 mAh g(-1)). Furthermore, the all-MXene-based integrated cathode displayed outstanding rate capacity of 288 mAh g(-1) at 10 C and long-life cyclability. Therefore, this proposed strategy of constructing an all-MXene-based cathode can be readily extended to assemble a large number of MXene-derived materials, from a group of 60+ MAX phases, for applications such as various batteries and supercapacitors.
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