Polycrystalline 1-D TiN-based free-standing composite electrode for high performance of Li-polysulfide cells

被引:7
作者
Beyene, Anteneh Marelign [1 ,2 ]
Yun, Jong Hyuk [1 ]
Ahad, Syed Abdul [1 ]
Moorthy, Brindha [1 ]
Kim, Do Kyung [1 ]
机构
[1] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Daejeon 34141, South Korea
[2] AAiT, Sch Chem & Bioengn, King George VI St, Addis Ababa 1000, Ethiopia
基金
新加坡国家研究基金会;
关键词
Lithium-sulfur batteries; Titanium nitride; Polar host; Free-standing electrode; RECHARGEABLE LITHIUM; TITANIUM NITRIDE; GRAPHENE OXIDE; S BATTERIES; SULFUR; CATHODE; DISSOLUTION; FOAM;
D O I
10.1016/j.apsusc.2019.143544
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Li-sulfur batteries are expected to transform electrochemical energy storage technology by taking it to the next level, as it holds the possibility to obtain a higher energy density levels than state-of-the-art Li-ion batteries. The poor electrical conductivity of sulfur and the high diffusivity of the intermediate lithium polysulfides create various problems, which limit the utilization of the full potential of these batteries. Polar conducive sulfur hosts such as titanium nitride (TiN) make it possible to realize remarkable improvements in active material utilization and capacity retention outcomes over long-term cycling. It has not been possible to use these polar, conducive, ceramic materials for higher active material loading ( > 2 mg cm(-2)) due to their low flexibility compared to carbonaceous materials. Here, we demonstrate the possibility of designing a three-dimensional free-standing electrode using polycrystalline 1-D TiN for a relatively high sulfur loading of 2.5 mg cm(-2). The electrochemical performance of this 1-D TiN-based electrode is compared to that of an electrode based on 1-D TiO2 (the starting material for TiN synthesis). The results demonstrate the catalytic effect of TiN by virtue of its endowed conductivity, leading to remarkable capacity retention and better active material utilization at high C-rates compared to a TiO2-based electrode.
引用
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页数:9
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