成果報告書詳細
管理番号20110000000945
タイトル*平成22年度中間年報 次世代自動車用高性能蓄電システム技術開発 要素技術開発 大型リチウム二次電池用高安全性電解質の研究開発2
公開日2012/4/6
報告書年度2010 - 2010
委託先名日本合成化学工業株式会社
プロジェクト番号P07001
部署名スマートコミュニティ部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 高安全性電解質材料の探索:機能性イオン液体の創製 (1)新規イオン液体の合成と評価 平成21年度にイミダゾリウム系カチオンとシアノホスフェイト系アニオンPXn(CN)6-n(X=F,Cl)よりなる有望なイオン液体を見出した。本年度はこれらイオン液体の合成条件や精製方法の最適化を行った。図1にカチオンが1-エチル-3-メチルイミダゾリウムの場合の最終的な合成経路を示す。純度は、平成20年度に導入したイオンクロマトグラフ質量分析計などで確認した。
英文要約Title: Development of High-performance Battery System for Next-generation Vehicles / Elemental technology development / Research and development of high safety electrolytes for large-sized rechargeable lithium batteries (FY2010-FY2011) FY2010 Annual Report
Ionic liquids consisting of imidazolium-type cation and cyanophosphate-type anion had been created in FY2009. In FY2010, we have investigated the best conditions for the synthesis and purification. New ionic liquids have low melting point and low viscosity. Especially, EMI・PF3(CN)3 ionic liquid didn't become frozen at -30 degree C and showed high conductivity at this temperature. Moreover, electrochemical properties were very good in the Li salt-added system, and then it was suggested that EMI・PF3(CN)3 had potential as an electrolyte of Li-ion batteries for electric vehicles instead of organic solvents. For the new ionic liquids having cyanophsphate-type anion, we considered the relationship between the chemical structure and electrochemical properties using the computational science system introduced in 2008. We presumed the excellent electrochemical characteristic of PF3(CN)3 anion related to increase of volume by introducing cylinder shaped cyano groups, the asymmetric structure, and the existence of facial / meridional geometrical isomers. In FY2007, we had established the method to estimate the safety of ionic liquids contacted with charged cathodes. Using this method, we have examined the thermal stability of several ionic liquids and organic solvents such as EC / DMC contacted with Li0.5CoO2 and Li0.4Co0.3Mn0.3Ni0.3O2. For an ionic liquid having PF3(CN)3 anion, the exothermic onset temperature was over 200 degree C but the amount of heat was comparatively large. However, the heat value decreased in the Li salt-added system. On the other hand, it was found that the addition of organic solvents to ionic liquids caused lower safety as the flash point was extremely reduced and the exothermic temperature was lower. We evaluated the biochemical safety of ionic liquids by the acute oral toxicity test using rats. By classification of toxicity, it was confirmed that ionic liquids of cyanophosphate-type anions were very toxic among other ionic liquids.
ダウンロード成果報告書データベース(ユーザ登録必須)から、ダウンロードしてください。

▲トップに戻る