Metal-organic frameworks (MOFs) derived carbon-coated NiS nanoparticles anchored on graphene layers for high-performance Li-S cathode material
Metal-organic frameworks (MOFs) derived carbon-coated NiS nanoparticles anchored on graphene layers for high-performance Li-S cathode material
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DOI：
10.1088/1361-6528/abae9b
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发表时间：
2020-08
期刊：
影响因子：
3.5
通讯作者：
Feng Zou;Kewei Liu;Chung-fu Cheng;Yijie Ji;Yu Zhu
中科院分区：
文献类型：
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作者：
Feng Zou;Kewei Liu;Chung-fu Cheng;Yijie Ji;Yu Zhu
由于其高容量（1675 mAh g−1），锂硫电池被认为是理想的储能系统之一。锂硫电池面临的最大挑战是固硫和提高正极材料的导电性。碳硫复合材料和极性材料（Ni（OH）2、TiO 2、MnO 2、TiS 2、Co 9 S8等）的结合已被证明是实现良好锂硫电池性能的两条最有效的途径。然而，每种策略都有缺点：C-S复合材料的体积密度低，极性材料往往缺乏导电性。因此，碳和极性材料的杂化将提供协同效应，实现理想的硫阴极。在此，通过水热反应，然后通过两个步骤的退火，在石墨烯片上生长碳包覆的NiS纳米颗粒的杂化材料被合成。所获得的复合材料具有石墨烯和NiS之间的良好平衡的比例。在锂硫电池中证明了优化的能量密度。
Due to its high capacity (1675 mAh g−1), Li-S batteries have been considered as one of the ideal energy storage systems. The grand challenges of lithium-sulfur batteries are sulfur immobilization and improving electrical conductivity of cathode composite. The carbon-sulfur (C-S) composites and the polar materials (Ni(OH)2, TiO2, MnO2, TiS2, Co9S8, etc) integration have been proven to be two of the most effective routes to achieving good Li-S battery performance. However, each strategy has drawbacks: the C-S composites have low volume density and the polar materials are often lack of electrical conductivity. Therefore, the hybridization of carbon and polar materials shall provide synergistic effects achieving ideal sulfur cathode. Herein, a hybrid material with carbon-coated NiS nanoparticles grown on graphene sheets was synthesized through a hydrothermal reaction followed by two steps of annealing. The obtained composite has a well-balanced ratio between graphene and NiS. An optimized energy density was demonstrated in lithium-sulfur cells.