化学学报 ›› 2018, Vol. 76 ›› Issue (8): 644-648.DOI: 10.6023/A18020081 上一篇    

研究论文

高比能高功率全石墨烯锂离子电容器

顾晓瑜a, 洪晔a, 艾果c, 王朝阳b, 毛文峰a,b   

  1. a 广州汽车集团股份有限公司汽车工程研究院 广州 510640;
    b 华南理工大学材料科学与工程学院 广州 510640;
    c 工业和信息化部电子第五研究所电子元器件可靠性物理及其应用技术重点实验室 广州 510610
  • 收稿日期:2018-02-27 出版日期:2018-08-15 发布日期:2018-06-07
  • 通讯作者: 艾果, 王朝阳, 毛文峰 E-mail:aiguo_pku@163.com; zhywang@scut.edu.cn; maowenfeng@gaei.cn
  • 基金资助:

    项目受国家自然科学基金(Nos.51702103,51602058)、广东省自然科学基金(No.2017A030313081)、中国博士后基金(No.2017M610527)、广东省科技计划(No.2017A010103011)和国家重点实验室开放基金(No.ZHD201705)资助.

All Graphene Lithium Ion Capacitor with High-Energy-Power Density Performance

Gu Xiaoyua, Hong Yea, Ai Guoc, Wang Chaoyangb, Mao Wenfenga,b   

  1. a Guangzhou Automobile Group Co., Ltd. Automotive Research & Development Center, Guangzhou 510640;
    b School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640;
    c Science and Technology on Reliability Physics and Application of Electronic Component Laboratory, No.5 Electronic Research Institute of the Ministry of Industry and Information Technology, Guangzhou 510610
  • Received:2018-02-27 Online:2018-08-15 Published:2018-06-07
  • Contact: 10.6023/A18020081 E-mail:aiguo_pku@163.com; zhywang@scut.edu.cn; maowenfeng@gaei.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 51702103, 51602058), the Natural Science Foundation of Guangdong Province,China (No. 2017A030313081), China Postdoctoral Science Foundation (No. 2017M610527), the Science and Technology Planning Project of Guangdong (No. 2017A010103011), and Open Fund of State Key Laboratory of Electronic Components Reliability Physics and Its Application Technology (No. ZHD201705).

石墨烯由于拥有超高比表面积和超高电导率而被作为电化学电容器材料广泛研究.本文采用树脂为碳源,通过一种方便快捷的树脂交换法制备一种具有高比表面积的多级孔三维石墨烯(3DG).经过此种方法的催化、造孔、热处理等主要工艺步骤后,可显著增加石墨烯材料的小、介孔数量,从而提高材料的电化学性能.通过BET测试表明,3DG的比表面积可达2400 m2/g,孔体积达到2.0 cm3/g.以3DG作为正负极材料制备高比能量高功率型锂离子电容器(3DG-LIC),可使3DG-LIC的工作电压从传统超级电容器的2.5 V扩展到4.0 V,能量密度也从20 Wh/kg提高到105 Wh/kg.另外,相同的化学和微观结构能很好地平衡正负极的容量及速率,使高比能量高功率的3DG-LIC具有更宽阔的应用领域.

关键词: 三维石墨烯, 多级孔, 锂离子电容器, 预嵌锂

Taking advantage of the extended specific surface area and high conductivity, graphene has been widely subjected to extensive investigations by many research groups. Herein, three-dimensional graphene (3DG) were prepared by a facile and scalable ion-exchange method, which exhibited a porous structure with a specific surface area of 2400 m2/g and pore volume of 2.0 cm3/g. In a typical synthesis, two key procedures played an important role in preparing the novel characteristics of 3DG:First, metal ions were used as the catalysis to graphitize the ion-exchange resin. Second, an KOH activation step at low temperatures (800℃) was applied on the exchange resin to produce a hierarchical porous structure of 3DG materials. The method of catalysis, chemical activation and heating treatment can form a unique interconnected structure and also effectively prevent graphene nanosheets from aggregating. Various structural and morphology analyses have been characterized by X-ray powder diffraction, Raman, Scanning electron microscope and Transmission electron microscope. Additionally, the enhanced specific surface area can improve capacitor performance of 3DG, which exhibited a high specific capacitance of 250 F/g when measured in a three-electrode system (KOH aqueous solution) and 120 F/g in a symmetric supercapacitor (TEMABF4/PC organic electrolytes). Furthermore, the as-prepared 3DG were successfully employed as both cathode and anode active materials for lithium ion capacitors (3DG-LIC) with high energy density (105 Wh/kg) because the potential window of 3DG-LIC extended from 2.5 to 4.0 V compared to traditional supercapacitor (SC) by prelithiation of anode. The performance and operating mechanism of 3DG-LIC were further studied by cyclic voltammetry, galvanostatic charge/dis-charge, and electrochemical impedance spectroscopy. The similar chemistry and microstructure maximizes the capacity and rate performance of cathode and anode, which indicates that the 3DG-LIC can be a promising candidate for high-energy-power storage system and would have a wide application in other electrochemical applications.

Key words: three-dimensional graphene, hierarchical porous structure, lithium ion capacitor, prelithiation