摘要
锂硫电池以其高理论能量密度、低成本和环境友好等特征,正在引起越来越多科学家和产业界人士的关注。利用正硅酸四乙酯水解与多巴胺自聚合之间的相互促进作用,通过一步水热反应制备出具有空心结构的SiO_(2)/氮掺杂碳复合微球。破裂微球的扫描电镜照片证实了复合微球的空心结构,热重分析则明确了SiO_(2)/氮掺杂碳复合微球中的氮掺杂碳含量为74.1%。电化学测试结果表明,采用SiO_(2)/氮掺杂碳复合微球为载硫材料制备的锂硫电池在0.05 C时的首圈放电比容量为1204 mAh/g,其在2 C时的放电比容量为677 mAh/g。因此,提供了一种SiO_(2)/氮掺杂碳复合微球载硫材料的通用有效的合成方法。
Lithium sulfur battery is attracting more and more attention by scientists and industrial researchers for its high theoretical energy density,low cost and environmental friendliness.Hollow SiO_(2)/N-doped carbon composite microspheres were prepared by one-step hydrothermal reaction based on the interaction between hydrolysis of tetraethyl orthosilicate and self-polymerization of dopamine.Scanning electron microscope(SEM)images of broken microsphere confirmed the hollow structure of the obtained composite microspheres.Thermogravimetric analysis indicated that the content of nitrogen doped carbon in SiO_(2)/nitrogen doped carbon composite microspheres was about 74.1%.Electrochemical results show that the discharge capacities of the resultant lithium sulfur battery is 1204mAh/g at 0.05 C in the first cycle and 677 mAh/g at 2 C when the SiO_(2)/N-doped carbon composite microspheres are used for sulfur loading.Therefore,a general and effective synthesis method of SiO_(2)/N-doped carbon microsphere was provided for lithium-sulfur batteries.
作者
胡锦飞
王庆杰
徐旭升
杨清华
史家远
HU Jinfei;WANG Qingjie;XU Xusheng;YANG Qinghua;SHI Jiayuan(State Key Laboratory of Advanced Chemical Power Sources,Guizhou Meiling Power Sources Co.,Ltd.,Zunyi,GuiZhou 563000,China)
出处
《电源技术》
CAS
北大核心
2023年第2期215-219,共5页
Chinese Journal of Power Sources
基金
贵州省科技计划项目(黔科合支撑[2020]2Y057)。
关键词
锂硫电池
二氧化硅
氮掺杂碳
电化学性能
lithium sulfur battery
silica
N-doped carbon
electrochemical performance
