Development for Materials Providing Breakthrough in Electric Double Layer Capacitor Performance

材料开发为双电层电容器性能带来突破

• 批准号: 14550793
• 负责人: ISHIKAWA Masashi
• 金额: $ 2.11万
• 依托单位: Kansai University (2003)Yamaguchi University (2002)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550793/
• 关键词: Electric Double Layer Capacitor; Gel Electrolyte; EV; High Rate Cycling; Rechargeable Battery; EDLC; Auxiliary Power Source; Backup Power Source; コンデンサ; 低温プラズマ; 炭素電極; エネルギーデバイス; 非水系キャパシタ; 有機電解質

To enhance the performance of electric double layer capacitors(EDLCs), we attempted to improve electrode and electrolyte material drastically. As a result of the effort, we have got fruitful achievement as follows :A gel electrolyte based on PVdF-HFP has been applied to EDLCs. Technical renewal, i.e., an extremely thin gel electrolyte film(thickness : ca.10μm) and the optimization of electrode-electrolyte interface junction, successfully provided prominent EDLC performance. Especially, when an extremely high rate charge-discharge current was applied to the present gel EDLC, no decrease in discharge capacitance was observed while the corresponding EDLC with a conventional organic electrolyte showed a decrease in the capacitance. This result is noteworthy because our gel EDLC is very thin as described above and contains usual activated carbon sheet electrodes.We have also attempted to improve electrode material for EDLCs. The exposure of activated carbon electrode to cold plasma generated from fluorinated or alkoxysilane gas induced the generation of surface functional groups and the optimization of pore size distribution at an electrode interface. This modification enhanced the rate capability of the carbon electrode. Furthermore, we applied "carbon nanotube sheet", carbon nanotubes oriented vertically on an aluminum foil like carpet pile, to an EDLC electrode. It was found that the carbon nanotube sheet electrode is suitable for a high rate cycling ; the electrode can provide a high capacitance even with a high current in so much that the capacitance of an EDLC with usual activated carbon electrodes becomes zero.In addition, we tried to apply some of the above-mentioned technologies to rechargeable lithium battery systems.

为了提高双电层电容器（EDLC）的性能，我们试图大幅改善电极和电解质材料。通过以上工作，我们取得了如下成果：将PVdF-HFP凝胶电解质应用于双电层液晶。技术更新，即，极薄的凝胶电解质膜（厚度约10 μm）和电极-电解质界面的优化，成功地提供了突出的EDLC性能。特别是，当一个非常高的速率充电-放电电流施加到本凝胶EDLC，没有观察到放电电容的减少，而相应的EDLC与常规的有机电解质显示电容的减少。这个结果是值得注意的，因为我们的凝胶EDLC如上所述非常薄，并含有通常的活性炭片电极。将活性炭电极暴露于由氟化或烷氧基硅烷气体产生的冷等离子体中诱导了表面官能团的产生和电极界面处孔径分布的优化。这种改性提高了碳电极的倍率性能。此外，我们将“碳纳米管片”，即在铝箔上垂直取向的碳纳米管，如地毯堆，应用于EDLC电极。结果表明，碳纳米管片电极适用于高倍率循环，即使在大电流下也能提供高电容，甚至使采用普通活性炭电极的双电层电容器的电容变为零。此外，我们还尝试将上述技术应用于可充电锂电池系统。

项目成果

N.Yoshimoto, A.Okamoto, M.Ishikawa, M.Morita: "Polymeric Gel Electrolyte Based on P(PVdF-HFP) for Polyacene Anode"Electrochemistry. 71. 1049-1051 (2003)

N.Yoshimoto、A.Okamoto、M.Ishikawa、M.Morita：“用于多并苯阳极的基于 P(PVdF-HFP) 的聚合物凝胶电解质”电化学。

M.Morita: "Nonflammable Organic Electrolyte Solution Based on Perfluoro-ether Solvent for Lithium Ion Batteries"Electrochemistry. 71巻. 1067-1069 (2003)

M.Morita：“用于锂离子电池的基于全氟醚溶剂的不易燃有机电解质溶液”电化学，第 71 卷，1067-1069 (2003)

M.Morita: "Polymeric Gel Electrolytes Using a Network Matrix with Carbonyl Groups for Rechargeable Lithium Batteries"Solid State Ionics. 152-153巻. 161-167 (2002)

M.Morita：“使用带有羰基的网络基质的可充电锂电池的聚合物凝胶电解质”，《固态离子学》第 152-153 卷（2002 年）。

N.Yoshimoto: "Ionic Conductance Behavior of Polymeric Electrolytes Containing Magnesium Salts and Their Application to Rechargeable Batteries"Solid State Ionics. 152-153巻. 259-266 (2002)

N. Yoshimoto：“含有镁盐的聚合物电解质的离子电导行为及其在可充电电池中的应用”，固态离子学，第 152-153 卷（2002 年）。

石川正司: "大容量キャパシタ技術と材料II 第7章9項"シーエムシー出版. 9 (2003)

石川雅史：《大型电容器技术与材料 II 第 7 章第 9 节》CMC 出版 9 (2003)。