成果報告書詳細
管理番号20150000000683
タイトル*平成26年度中間年報 新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業 (燃料電池・蓄電池) 高出力蓄電デバイス用シート電極の技術開発
公開日2016/3/1
報告書年度2014 - 2014
委託先名アイ・エレクトロライト合同会社 学校法人関西大学
プロジェクト番号P10020
部署名イノベーション推進部
和文要約
英文要約Title: New Energy Venture Business Technology Innovation Program / New Energy Venture Business Technology Innovation Program (fuel cells and storage battery) / Development of electrode sheets for high power energy storage devices. (FY2014-FY2015) FY2014 Annual Report

A physical and chemical property of a cathode coating paint for the lithium ion battery was investigated in i-Electrolyte LLC from industrial view point. An alginate was used as a binder for the cathode active material of LiNi1/3Co1/3Mn1/3 (LNCM) in aqueous system. Generally the aqueous system of the cathode paint is hard to realize because the metal cations are dissolved into water from the active material, and the pH of the paint increases rapidly. This causes the instability of the physical properties of the paint. In typical case, the paint changes to a gel. For a preliminary test, 6 kind of coating paint 200g of each were prepared by using Alginate (PowerbinderTM ) as the binder. The composition of the paint is LNCM : conducting material : Powerbinder by varying their ratio. The solid content is fixed to 60 %. The pH and viscosity of the paints were measured 0, 24, and 120 h after preparation. The change of those value are very few during this period for all paints, the paints showed a good stability. Of course no gelation was occurred. Three kinds of cathodes were prepared and the cells were prepared based on those cathodes using lithium metal as an anode. The composition of the three cathodes were LNCM/Conductive carbon/pVDF (organic solvent as a a dispersion was used), LNCM/Conductive carbon/Binder X (X is water based binder under development), and LNCM/Conductive carbon/Powerbinder (this work). The capacity of the cells was 140 mAh, 140 mAh, and 170 mAh respectively. In Kansai University, we applied the LNCM positive electrode prepared with the alginate binders to “ionic liquid-based LIBs”. Herein, two LNMC positive electrodes with alginate binders containing different counter cations were prepared, and their charge-discharge behavior evaluated in a LiFSI/EMImFSI electrolyte. Both LNMC electrodes maintained their discharge capacity during 40 cycles even at high potential operation, 3.0 - 4.5 V vs. Li/Li+. The use of the alginate binders enables LNMC to operate with high discharge capacity compared with the LNMC using a conventional binder. Another two natural polymers, chitosan and gelatin, were investigated as a binder for LNMC positive electrode. We successfully prepared and optimized the corresponding LNMC positive electrodes with both binders. Then, charge-discharge measurements reveal that the stable operation of both LNMC electrodes with both binders can be achieved during 50 cycles, which is comparable to that of PVdF. It is also found that the gelatin binder is applicable not to LIBs but also electric double layer capacitors (EDLCs). We proposed an activated carbon-based composite electrode using the gelatin binder. The nonaqueous EDLC cell that contained this electrode showed stable charge-discharge operation even over 3.0 V cell voltage.
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