硫/石墨烯气凝胶的绿色可控制备及锂硫电池性能

doi:10.19894/j.issn.1000-0518.200275

摘要/Abstract

摘要： 以氧化石墨烯(GO)为碳前驱体,H₂O₂作为绿色氧化剂,H₂S为还原剂和硫源,水热法制备了硫含量可控的硫/石墨烯气凝胶。通过调控加入到GO溶液中H₂O₂的用量使复合物中硫的质量分数在64%～84%间变动。将硫/石墨烯气凝胶用于锂硫电池正极材料,硫质量分数为70%的复合物表现了较好的锂硫电池性能,在0.1 A/g的电流密度下,其放电比容量可达1290 mA·h/g,在1.0 A/g的电流密度下循环100次,其比容量从385 mA·h/g逐渐降低到275 mA·h/g,保持率为71.4%,表现了较好的循环稳定性。该方法将有毒的H₂S用H₂O₂氧化成单质硫,同时H₂O₂被还原成H₂O,此过程中没有产生任何污染物,实现了硫/石墨烯气凝胶的绿色制备。

关键词: 硫/石墨烯气凝胶, 绿色, 可控制备, 锂硫电池

Abstract: The sulfur/graphene aerogel (GM-S) with controllable sulfur content was produced by the hydrothermal method using oxide graphene (GO), H₂O₂ and H₂S as the carbon precursor, oxidant and reductant, respectively. The sulfur content can be controlled in the range of 64%～84% mass fraction by changing the volume of 10% H₂O₂ solution. The GM-S with 70% of sulfur content (GM-S-70) shows an excellent Li-S battery performance. The GM-S-70 possesses the specific capacity of 1290 mA·h/g at the current density of 0.1 A/g. After 100 cycles at 1.0 A/g, the specific capacity of GM-S-70 decreases slowly from the 385 to 275 mA·h/g with the retention ratio of 71.4%, indicating a good cycling stability. This study provides a green method for the formation of GM-S through translating toxic hydrogen sulfide to sulfur without producing any contaminant during the whole process.

Key words: Sulfur/Graphene aerogel, Green method, Controllable synthesis, Li-S battery

中图分类号:

O613
TB333

高峰, 徐子迪, 管纯倩, 王研, 臧云浩, 顾建峰, 曲江英. 硫/石墨烯气凝胶的绿色可控制备及锂硫电池性能[J]. 应用化学, 2021, 38(4): 439-446.

GAO Feng, XU Zi-Di, GUAN Chun-Qian, WANG Yan, ZANG Yun-Hao, QU Jiang-Ying. Green Controllable Synthesis of Sulfur/Graphene Aerogel and Performance of Lithium Sulfur Battery[J]. Chinese Journal of Applied Chemistry, 2021, 38(4): 439-446.

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