Journal
CARBON
Volume 139, Issue -, Pages 896-905Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2018.07.063
Keywords
Hafnium oxide; Carbon nanotube; Interlayer; Polysulfide; Li-S battery
Funding
- National Natural Science Foundation of China [51472141]
- National Key Research and Development Program of China [2017YFA0205800]
- NSF [ECCS-1610806]
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Ultrathin and cross-stacked carbon nanotube (CNT) films modified with hafnium oxide (HfO2) by atomic layer deposition are employed as efficient polysulfide barriers for high performance Li-S batteries. A HfO2/CNT interlayer has an ultrathin, flexible structure with a thickness of 1.5 mu m and an areal density of 0.087 mg cm(-2), along with excellent wettability to electrolyte. The highly conductive CNT network and the catalytic surface adsorption of polysulfide species by HfO2 significantly suppress the polysulfides shuttling phenomenon. With high sulfur loadings of up to 75 wt%, electrodes incorporating a HfO2/CNT interlayer show noticeable improvements in various electrochemical properties, including long-term cycling stability (721 mA h g(-1) after 500 cycles at 1 C), high rate performance (800 mA h g(-1) at 5 C), favorable anti-self-discharge capabilities, and suppression of Li anode corrosion. These results suggest a new and efficient polysulfide trapping material and a viable configuration for high-performance Li-S batteries. (C) 2018 Elsevier Ltd. All rights reserved.
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