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Sato T.,National Institute of Technology, Tsuruoka College | Marukane S.,National Institute of Technology, Tsuruoka College | Morinaga T.,National Institute of Technology, Tsuruoka College | Uemura T.,Kyoritsu Chemical and Co. | And 2 more authors.
Journal of Power Sources | Year: 2011

We present a new method to improve the rate capability of an electric double layer capacitor (EDLC) using a thin polymer layer having a high concentration of carbon material on a current collector (CLC). A novel thermocuring coating composed of a glycol-chitosan, a pyromellitic acid and a conductive carbon powder can form stable CLC on a metal foil current collector simply by spreading and curing at 160 °C for a couple of minutes. We compared the performance of some demonstration EDLC cells using three kinds of current collector: a conventional aluminum oxide foil for EDLC, an aluminum foil and an aluminum foil with CLC. The cell with the CLC had a much higher rate capability than the cell without CLC. Only the CLC cell was able to discharge at a current density of 500C. This cell shows a slight deterioration in capacity in a high temperature, continuous charging, life test, and the CLC has a suppressing effect on the internal resistance increase of EDLCs. The use of a CLC film current collector is one of the most effective and simple methods for the improvement of EDLC rate performance. In particular, a current collector consisting of aluminum foil coupled with a CLC promises to be a low cost alternative to the aluminum oxide foil commonly used in EDLCs. © 2010 Elsevier B.V. All rights reserved.

Kenmochi T.,Kyoritsu Chemical and Co.
ECS Transactions | Year: 2010

UV curable sealant 1-2) contributes making CCD&CMOS image sensor packages. Those packages applied mobile phone, DSC, DVC, DSLR (Digital Single Reflex), Security and Automotive. Especially, high pixel size as DSC, DVC, and DSLR as consumer products and industrial products as automotive also need to have high reliability spec. Therefore, Kyoritsu Chemical UV curable sealant must have high performance and satisfy these image sensor packages sepc. Currently in market, they require MSL/JEDEC Reflow. UV curable sealant must change and/or consider next new characteristics. Kyoritsu Chemical, we have offered special UV curable sealant and solve issues assembled packages' problems. ©The Electrochemical Society.

Uemura T.,Kyoritsu Chemical and Co.
Kobunshi Ronbunshu | Year: 2013

Attaching the active material layer to the aluminum current collector by a conductive-coating layer lowers the interfacial resistance and improves the charging and discharging characteristics of rechargeable lithium-ion batteries. We have discovered that the resistance decreases by using a binder, which has been crosslinked by the esterification of a hydroxyl-group water-soluble polymer and polycarboxylic acid. In this study, we probed the relationship between the physical properties of the binder used in the conductive-coating materials and the properties of the batteries to explore the causes of the reduction of the resistance. The results of this investigation revealed that, owing to the contraction stress that accompanies binder drying and dehydration, conductive carbon particles break through the insulation film that exists on the surface of aluminum current collectors. Furthermore, because the binder inhibits the mutual exchange reaction between lithium and aluminum, a void is created on the interface, which prevents battery deterioration. © 2013, The Society of Polymer Science.

Sakemi D.,University of Kitakyushu | Futagami W.,University of Kitakyushu | Kudo Y.,University of Kitakyushu | Onoue S.,Kyoritsu Chemical and CO. | And 2 more authors.
Kobunshi Ronbunshu | Year: 2013

Single-walled and multi-walled carbon nanotubes (CNTs) are soluble in toluene containing titanium (IV) tetrabutoxide and their surface could be successfully covered with an ultrathin TiO2 layer. AFM, SEM, TEM, XPS, X-ray and TG-DTA analysis indicate the TiO2 coating on the surface of CNTs through the hydrolysis of bound titanium alkoxid molecules. After calcination at 450-55O°C, the SWNTs were completely decomposed from the composites and crystalline TiO2 nanotubes that reflect the shape of the SWNTs were formed. From the XPS results of the prepared TiO 2MWNTs samples, the atomic ratio of Ti to C is circa 1:100, indicating that the coated TiO2 layer is very thin. The current approach provides a new direction for hybridization of CNTs with TiO2 that is photocatalytically active in TiO2/CNTs nanocomposites. ©2013, The Society of Polymer Science, Japan.

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