Journal
ENERGY STORAGE MATERIALS
Volume 41, Issue -, Pages 141-151Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2021.05.030
Keywords
Li-S battery; N-Ti3C2 MXene; 3D printing; Concurrent; Dendrite-free
Funding
- National Natural Science Foundation of China [51702225]
- National Key RAMP
- D Program of China [2016YFB0100200]
- Suzhou Science and Technology ProjectProspective Application Research Program [SYG202038]
- Suzhou Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Suzhou, China
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A multifunctional 3D printed framework comprising nitrogen-doped porous Ti3C2MXene is proposed to regulate both electrodes of Li-S batteries. The framework possesses high conductivity and ample nitrogen sites for synergizing lithiophilic-sulfiphilic feature.
The practical implementation of Li-S battery has been equally hampered by uncontrollable dendritic growth at the anode and inferior high-loading performance at the cathode. It is therefore desirable to explore multifunctional host candidate coupled with advanced fabrication technique to concurrently modulate both electrodes. Herein, we propose a versatile 3D printed (3DP) framework comprising nitrogen-doped porous Ti3C2 MXene (N-pTi(3)C(2)T(x)) that is competent in regulating dual electrodes of Li-S batteries. Such a 3DP scaffold possesses hierarchical porosity, high conductivity, as well as ample nitrogen sites to synergize lithiophilic-sulfiphilic feature. Serving as a dendrite inhibitor, 3DP N-pTi(3)C(2)T(x) interlayer could dissipate the local current and homogenize Li deposition, accordingly rendering a dendrite-free anode to maintain an ultralong lifespan up to 800 h at 5.0 mA cm(-2)/5.0 mAh cm(-2). Meanwhile, the 3DP N-pTi(3)C(2)T(x) host enables suppressed polysulfide shuttle and accelerated sulfur electrochemistry especially under elevated sulfur loadings. Thus-printed Li-S full cells (3DP N-pTi(3)C(2)T(x)/S parallel to 3DP N-pTi(3)C(2)T(x)@Li) can continuously operate over 250 cycles at a sulfur loading of 7.56 mg cm(-2), accompanied by a capacity decay of 0.06% per cycle. More impressively, an ultimate capacity of 8.47 mAh cm(-2) is harvested after 60 cycles at 12.02 mg cm(-2).
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