成果報告書詳細
管理番号20100000000112
タイトル*平成20年度中間年報 系統連系円滑化蓄電システム技術開発/次世代技術開発/高イオン伝導ネットワークチャンネルによる安全なリチウムイオン二次電池の研究開発
公開日2010/2/5
報告書年度2008 - 2008
委託先名独立行政法人国立高等専門学校機構鶴岡工業高等専門学校  国立大学法人京都大学
プロジェクト番号P06004
部署名燃料電池・水素技術開発部 蓄電技術開発室
和文要約以下本編抜粋:1.研究開発の内容及び成果等(1)研究の内容 本研究ではリチウムイオン電池の安全性向上のため、新規なアプローチによる難燃型ポリマー電解質を開発する。難燃性のイオン液体モノマーに表面開始リビングラジカル重合を適用してシリカ微粒子上にイオン液体ポリマーブラシを形成する。このシリカ/ポリマーブラシ複合体(SiP)は、少量のイオン液体中でブラシ鎖の立体斥力により三次元配列したコロイド結晶を形成する。高い分子運動性を有するブラシ末端は連続したイオン伝導ネットワークチャネルを形成すると考えられ、このコロイド結晶を固体化して、不燃性を生かしながらイオン伝導性に優れるポリマー電解質を開発する。本研究では固体イオンチャンネルポリマー電解質の合成、特性評価、リチウムイオン電池への適用を図り、リチウムイオン電池の安全性向上とコストダウンを目指す。
英文要約Title: Development of an Electric Energy Storage System for Grid-connection with New Energy Resources/Development of Technology for Next Generation Energy Storage Devices / Development of a solid polymer electrolyte with high ion-conductive network structure for a safety lithium ion battery(FY’07-09) FY’08 Annual Report A monodisperse silica particle(SiP) was surface-modified with an atom transfer radical polymerization initiating site. The surface-initiated ATRP of ionic liquid monomer mediated by a copper complex was carried out with the initiator-fixed SiP. We confirmed polymerization proceeded in a living manner, successfully producing a hybrid SiP coated with an ionic-liquid type of concentrated polymer brushes. Monodisperse SiP grafted with a concentrated poly(ionic-liquid) polymer brush layer and suspended in an ionic liquid formed a pseudo-colloidal crystal in a certain concentration range. In a pseudo-colloidal crystal, the ends, with relatively high mobility, of highly stretched graft chains are expected to be eccentrically localized near interparticle-boundary region, giving a 3-D network with a high ionic conductivity. Succeeded in solidification of the pseudo-colloidal crystal from the mixture of hybrid SiP, ionic liquid and volatile organic solvent by method of evaporating solvent. This solidified pseudo-colloidal crystal, which had a high mechanical strength, showed two order or more of magnitude higher ionic-conductivity than traditional solid polymer electrolyte: Thus, SiPs in solid polymer electrolyte was regularly arranged with almost the same interval by scanning electron microscopic and scanning probe microscopic observation. These results strongly suggest the existence of high ion-conductive polymer network in solid polymer. It is a new polymer electrolyte with a new ion-conductive mechanism, which we would term an ion-channel polymer electrolyte. In this yr, ionization condition of Li-ion in the ion-channel solid polymer electrolyte was confirmed based on diffusion coefficient by pulsed gradient spin-echo(PGSE)NMR tech. We found diffusion coefficient ratios of lithium cation and anion species(DLi /DF) was greatly different in ionic liquid and a solid polymer electrolyte. In ionic liquid, only mobility of lithium cation falls greatly compared with anion and ammonium cation. It was considered for very strong interaction between lithium cation and anions. In solid electrolyte, lithium shows higher diffusion coefficient than anion. It is suggested that the suitable environments for lithium migration exists in ion channel in spite of solid. We will use the knowledge for improvement of ion conductivity for polymer electrolyte. In FY’08, we designed a new non-flammable Li-ion cell, fabricated with an ion-channel solid polymer electrolyte and evaluated that performance. The test cell composition was [Li4Ti5O12 (negative electrode)/solid polymer electrolyte developed by investigation/LiMn2O4 (positive electrode)].
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