A new method for producing high density ACF and its application to the electrodes of EDLCs

高密度ACF的制备新方法及其在EDLC电极中的应用

• 批准号: 10555273
• 负责人: MIURA Kouichi
• 金额: $ 8.13万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10555273/
• 关键词: High density activated carbon fiber; Hot briquetting; Binderless; Electric double layer capacitor; 熱間成型法

Activated carbon fiber (ACF) has high surface area and its adsorption/desorption rate is very high compared with granular activated carbons. However, its low bulk density is one of the weak points. In order to overcome this weak point, we developed a new method to produce high density ACFs (HD-ACFs) and examined the possibility for using HD-ACFs as the electrodes of the electric double layer capacitor (EDLC).We could produce HD-ACFs by the hot briquetting of stabilized fiber and subsequent carbonization and activation of the fiber. In our method, neither any other processes like crushing nor any binders are required. The bulk density of the HD-ACF could be easily controlled from 0.2 to 0.86 g/cm3 by changing the load of mechanical pressure during the hot briquetting. The hot briquetting process was found not to affect the subsequent carbonization and activation processes, so the HD-ACF has almost same micropore structure as the non formed ACF when we compare at a same activation level. Thus we could produce ACF with high bulk density without losing the high adsorption performance of ACF.The capacitance of the EDLC with the HD-ACF electrode increased with the increase of bulk density of the HD-ACF, indicating that individual fibers are highly packed without losing their capacitance. The capacitance also increased in proportion to the size of the HD-ACF electrode. On the other hand the initial discharge current of the EDLC was little dependent on either the bulk density or the size of the HD-ACF electrode. These results clarified that the HD-ACF electrode is suitable for constructing a high power EDLC.

活性炭纤维（ACF）具有比表面积大、吸附/脱附速率高的特点。然而，其低堆积密度是弱点之一。为了克服这一缺点，我们开发了一种制备高密度活性炭纤维（HD-ACFs）的新方法，并探讨了HD-ACFs作为双电层电容器（EDLC）电极材料的可能性。在我们的方法中，既不需要任何其他过程，如破碎，也不需要任何粘合剂。在热压成型过程中，通过改变机械压力的大小，可以很容易地控制HD-ACF的体积密度在0.2~0.86g/cm~3之间。热压成型工艺不影响后续的炭化和活化过程，因此在相同活化水平下，HD-ACF与未成型ACF具有几乎相同的微结构。以HD-ACF为电极的双电层电容器的电容随着HD-ACF体积密度的增加而增加，表明单纤维高度堆积而不损失其电容。电容也与HD-ACF电极的尺寸成比例地增加。另一方面，双电层电容器的初始放电电流几乎不依赖于HD-ACF电极的体积密度或尺寸。这些结果表明，HD-ACF电极适合于构建高功率EDLC。

项目成果

K. Miura, H. Nakagawa: "Production of high density activated carbon fiber by a hot briquetting method"Carbon. 38 (1). 119-125 (2000)

K. Miura、H. Nakakawa：“通过热压块法生产高密度活性碳纤维”Carbon。

K.Miura, H.Nakagawa: "Production of High Density Activated Carbon Fiber by Use of Hot Briquetting Method" Carbon(印刷中).

K.Miura、H.Nakakawa：“利用热压块法生产高密度活性碳纤维”碳（印刷中）。

H. Nakagawa, K. Miura: "High capacity electric double layer capacitor with high density activated carbon fiber electrode"J. Electrochem. Soc. 147(1). 38-42 (2000)

H. Nakakawa，K. Miura：“具有高密度活性碳纤维电极的高容量双电层电容器”J。

K.Miura,H.Nakagawa: ""Production of High density activated carbon fiber by a hot briquetting method""Carbon. 38(1). 119-125 (2000)

K.Miura，H.Nakakawa：“通过热压块法生产高密度活性碳纤维”“碳。

K.Mirura, H.Nakagawa: ""Production of high denstiy activated cardon fiber by a hot briquetting method""Carbon. 38(1). 119-125 (2000)

K.Mirura、H.Nakakawa：“通过热压块法生产高密度活性卡顿纤维”“碳。