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《材料导报》期刊社  2018, Vol. 32 Issue (3): 357-361    https://doi.org/10.11896/j.issn.1005-023X.2018.03.002
     材料与可持续发展(一)—— 面向洁净能源的先进材料 ｜ |
大倍率二氧化硅/碳复合材料的制备及电化学性能表征
王艳珍1,2,3,陈明鸣1,2,3,王成扬1,2,3
1 天津大学北洋园校区化工学院,天津 300350
2 天津大学绿色合成与转化教育部重点实验室,天津 300350
3 天津化学化工协同创新中心,天津 300072
Preparation and Electrochemical Properties Characterization of High-rate SiO2/C Composite Materials
Yanzhen WANG1,2,3,Mingming CHEN1,2,3,Chengyang WANG1,2,3
1 School of Chemical Engineering and Technology, Peiyang Campus, Tianjin University, Tianjin 300350
2 Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University, Tianjin 300350
3 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072
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摘要 

为了满足新能源储能及电动汽车对锂离子电池持续快速充电、慢速放电性能的要求,以正硅酸乙酯为二氧化硅前驱体,在两亲性炭材料(ACM)与聚乙二醇400(PEG400)形成的氢键限域体系中制备了大倍率二氧化硅/碳复合锂电负极材料(SiO2-130/C)。材料表征结果表明,二氧化硅的粒径由500 nm(未限域)降低到130 nm(限域),同时,富碳的ACM在二氧化硅纳米颗粒表面构建了导电性良好的碳框架。在0.1 A·g -1和1 A·g -1的电流密度下,SiO2-130/C的可逆比容量分别为527 mAh·g -1和347 mAh·g -1,且在1 A·g -1的电流密度下连续400个充放电循环后,仍具有483 mAh· g -1的可逆比容量,表现出优异的倍率性能及稳定的电化学性能。

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王艳珍
陈明鸣
王成扬
关键词:  两亲性炭材料  二氧化硅/碳复合材料  倍率性能    
Abstract: 

High-rate SiO2/C composite (called SiO2-130/C) was synthesized using tetraethyl orthosilicate (TEOS) as SiO2 precursor in a amphiphilic carbonaceous material (ACM)-polyethylene glycol 400(PEG 400) mixture. Confinement effect of smaller cells formed by ACM and PEG 400 on diameter of SiO2 was studied. The results showed that the diameter of SiO2 nanospheres was reduced from 500 nm (without confinement effect) to 130 nm (with confinement effect),and carbon framework resulting from carbon-rich ACM was constructed on the surface of SiO2. Electrochemical performance of SiO2-130/C composite was evaluated as anode material for lithium ion batteries. The reversible capacities of the SiO2-130/C composite were 527 mAh ·g -1 and 347 mAh·g -1 at current densities of 0.1 A·g -1and 1 A·g -1, respectively. Moreover, the SiO2-130/C composite, after the process of electrochemical activation, exhibited reversible capacitance as high as 483 mAh·g -1 at a current density of 1 A·g -1 over 400 cycles,indicating great rate performance and long-term cycling stability of the as-prepared SiO2-130/C composite.

Key words:  amphiphilic carbonaceous material    SiO2/C composite    rate capability
出版日期:  2018-02-10      发布日期:  2018-02-10
ZTFLH:  TM912  
基金资助: 国家自然科学基金(51372168)
作者简介:  王艳珍:女,1991年生,硕士研究生,主要研究方向为锂离子电池负极材料 E-mail: wyz0614@tju.edu.cn|陈明鸣:通信作者,女,1971年生,教授,博士研究生导师,主要研究方向为新型炭材料与绿色电源技术 E-mail: chmm@tju.edu.cn
引用本文:    
王艳珍, 陈明鸣, 王成扬. 大倍率二氧化硅/碳复合材料的制备及电化学性能表征[J]. 《材料导报》期刊社, 2018, 32(3): 357-361.
Yanzhen WANG, Mingming CHEN, Chengyang WANG. Preparation and Electrochemical Properties Characterization of High-rate SiO2/C Composite Materials. Materials Reports, 2018, 32(3): 357-361.
链接本文:  
https://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.03.002  或          https://www.mater-rep.com/CN/Y2018/V32/I3/357
图1  (a)SiO2-500的扫描电镜图;(b)SiO2-500的透射电镜图;(c)SiO2-130/C复合材料的扫描电镜图;(d)SiO2-130/C的透射电镜图;(e)SiO2-130/C的线扫数据曲线(图(d)中线形所示区域);(f) SiO2-130/C的能谱分析及数据(图(d)中圆形所示区域)
图2  (a)SiO2-130/C在空气中的热重曲线和(b)SiO2-500与SiO2-130/C的XRD谱
图3  (a)SiO2-130/C与SiO2-500的CV曲线;(b)SiO2-130/C与SiO2-500的交流阻抗图;(c)SiO2-130/C的恒流充放电曲线;(d)SiO2-500与SiO2-130/C的倍率性能图
图4  SiO2-130/C的循环曲线
图5  SiO2-130/C充放电前后的交流阻抗图
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