石墨烯和碳纳米管对SiO2气凝胶负极材料的改性
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摘要:
为了缓解二氧化硅(SiO2)负极材料的体积膨胀开裂,改善其电化学性能,通过溶胶-凝胶法制备出三维网状结构的SiO2气凝胶纳米材料及其石墨烯改性材料(rGO/SiO2)和碳纳米管改性材料(CNT/SiO2),研究石墨烯和碳纳米管改性对SiO2气凝胶负极材料的储锂性能影响.利用X射线衍射分析仪、光电子能谱仪和扫描电子显微镜进行表征.电化学性能研究表明,石墨烯和碳纳米管改性提高了SiO2气凝胶负极材料的导电性、充放电比容量和库伦效率,其中CNT/SiO2提升作用更加显著,循环稳定性能最好.因此,在减轻材料体积膨胀和结构开裂、粉化,增加SiO2气凝胶负极材料的导电性方面,碳纳米管改性优于石墨烯改性.
In order to alleviate volume expansion and cracking of silicon dioxide anode materials and improve the electrochemical properties,three dimensional reticular silicon dioxide aerogel nanometer material(SiO2)and it’s modification materials of graphene(rGO/SiO2)and carbon nano-tubes(CNT/SiO2)were prepared respectively by sol-gel method,for studying the influence of graphene and carbon nano-tubes on lithium storage properties of silicon dioxide aerogel anode materials.Three kinds of silicon dioxide aerogel anode materials were characterized by X-ray diffraction(XRD)analyzer,X-ray photoelectron spectroscopy(XPS),and scanning electron microscope(SEM).The electrochemical analysis showed that the electrical conductivity,charge-discharge specific capacity and coulomb efficiency of silicon dioxide aerogel anode materials were improved by the modification of graphene and carbon nano-tubes.CNT/SiO2 was improved more significantly than rGO/SiO2 and it had the best cycling stability.Therefore,in terms of reducing the impact of material volume expansion and structure cracking and pulverization,and increasing the electrical conductivity,the modification of silicon dioxide aerogel with carbon nano-tubes is better than graphene.
作者:
毕文彦 王明亮 王秋芬 缪娟 万剑峰
Bi Wenyan;Wang Mingliang;Wang Qiufen;Miao Juan;Wan Jianfeng(College of Chemistry and Chemical Engineering,Henan Polytechnic University,Jiaozuo 454000,China;School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo 454000,China)
机构地区:
河南理工大学化学化工学院 河南理工大学机械与动力工程学院
出处:
《betway官方app 学报：自然科学版》 CAS 北大核心 2020年第2期73-79,共7页
基金:
河南省科技攻关项目(162102310152,162102210067)。
关键词:
锂电池 二氧化硅 气凝胶 石墨烯 碳纳米管
lithium battery silicon dioxide aerogel graphene carbon nano-tubes
分类号:
O646 [理学—物理化学]
