Polar, catalytic, and conductive CoSe2/C frameworks for performance enhanced S cathode in Li–S batteries

Publication date: September 2020Source: Journal of Energy Chemistry, Volume 48Author(s): Bo Yuan, Di Hua, Xingxing Gu, Yu Shen, Li-Chun Xu, Xiuyan Li, Bing Zheng, Jiansheng Wu, Weina Zhang, Sheng Li, Fengwei HuoAbstractLithium-sulfur battery (Li–S) is considered as one of the new-generation rechargeable batteries with high performance because of its extremely high theoretical capacity, energy density, environmental harmony and low cost. However, low electrical and ionic conductivity of sulfur, safety concerns and parasitic reaction generated by the dissolved polysulfide species in electrolyte hinder the commercialization of Li–S battery. Herein, we report a polyhedral porous structure comprising of carbon coating metal selenide nanoparticles (CoSe2/C), which could not only host sulfur for Li-S battery owing to its porous and conductive structure, but also mitigate the shuttle phenomenon by polysulfides adsorption and catalytic acceleration of redox kinetics. As a result, a performance enhanced CoSe2/C-S electrode for Li-S battery is achieved.Graphical abstractPolar, porous, conductive and electrochemical catalytic-active CoSe2/C nanomaterials were designed and served good hosts for sulfur cathode with improved reaction kinetics of polysulfides conversion, bestowing high-performance Li-S batteries.
Source: Journal of Energy Chemistry - Category: Chemistry Source Type: research