State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning, People's Republic of China.
Nanotechnology. 2020 Jan 17;31(3):035404. doi: 10.1088/1361-6528/ab4841. Epub 2019 Sep 26.
Lithium-sulfur (Li-S) batteries as a new generation of high energy batteries, with low cost and environmentally friendly, have a broad application prospects. While the poor conductivity of sulfur, the volume effect and 'shuttle effect' during charge and discharge, and slow redox kinetics of polysulfide intermediates still limit the practical application. To solve these problems, we synthesize a valid 3D hybrid material (CoS@N-CHS) of nanosized CoS evenly distributed on N-doped carbon hollow spheres with strong chemical coupling by in situ carbonization of Co(NO)@resorcinol/formaldehyde and sulfidation. It presents a high electronic conductivity, absorbing chemical adsorption capability to polysulfides and can catalyze the sulfur redox processes. Compared with S/AC and S/N-CHS electrodes, S/CoS@N-CHS electrodes achieve an excellent initial discharge specific capacity of 1337 mAh g at 0.1 C and a long cycle life with an ultralow capacity decay of 0.027% per cycle over 1000 cycles at 1.0 C and the coulombic efficiency is above 99%. Consequently, it is an effective sulfur host material for high performance Li-S batteries.
锂硫（Li-S）电池作为新一代的高能量电池，具有成本低、环保等优点，具有广阔的应用前景。然而，硫的导电性差、充放电过程中的体积效应和“穿梭效应”、多硫化物中间体的缓慢氧化还原动力学等问题仍然限制了其实际应用。为了解决这些问题，我们通过 Co(NO)@间苯二酚/甲醛的原位碳化和硫化，成功合成了一种有效的纳米 CoS 均匀分布在氮掺杂碳空心球上的 3D 杂化材料（CoS@N-CHS），具有很强的化学偶联。它具有高导电性、对多硫化物的化学吸附能力，并能催化硫的氧化还原过程。与 S/AC 和 S/N-CHS 电极相比，S/CoS@N-CHS 电极在 0.1 C 时具有 1337 mAh g 的优异初始放电比容量，在 1.0 C 下经过 1000 次循环后具有超低的容量衰减率 0.027%/循环，库仑效率高于 99%。因此，它是一种用于高性能 Li-S 电池的有效硫主体材料。
