Journal
ADVANCED MATERIALS
Volume 32, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201905658
Keywords
chemisorption; electrocatalysis; Li dendrite; Li-S full battery; TiN-VN heterostructure
Categories
Funding
- National Key R&D Research Program of China [2018YFB0905400]
- National Natural Science Foundation of China [51622210, 51872277, 51822202, 51925207, U1910210]
- DNL cooperation Fund, CAS [DNL180310]
- Fundamental Research Funds for the Central Universities [Wk2060140026]
- Shanghai Rising-Star Program [18QA1400100]
- Youth Top-notch Talent Support Program of Shanghai
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Lithium-sulfur (Li-S) batteries are strongly considered as next-generation energy storage systems because of their high energy density. However, the shuttling of lithium polysulfides (LiPS), sluggish reaction kinetics, and uncontrollable Li-dendrite growth severely degrade the electrochemical performance of Li-S batteries. Herein, a dual-functional flexible free-standing carbon nanofiber conductive framework in situ embedded with TiN-VN heterostructures (TiN-VN@CNFs) as an advanced host simultaneously for both the sulfur cathode (S/TiN-VN@CNFs) and the lithium anode (Li/TiN-VN@CNFs) is designed. As cathode host, the TiN-VN@CNFs can offer synergistic function of physical confinement, chemical anchoring, and superb electrocatalysis of LiPS redox reactions. Meanwhile, the well-designed host with excellent lithiophilic feature can realize homogeneous lithium deposition for suppressing dendrite growth. Combined with these merits, the full battery (denoted as S/TiN-VN@CNFs || Li/TiN-VN@CNFs) exhibits remarkable electrochemical properties including high reversible capacity of 1110 mAh g(-1) after 100 cycles at 0.2 C and ultralong cycle life over 600 cycles at 2 C. Even with a high sulfur loading of 5.6 mg cm(-2), the full cell can achieve a high areal capacity of 5.5 mAh cm(-2) at 0.1 C. This work paves a new design from theoretical and experimental aspects for fabricating high-energy-density flexible Li-S full batteries.
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