成果報告書詳細
管理番号20100000000111
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/炭素微小球体を用いる次世代蓄電デバイスの研究開発
公開日2010/3/24
報告書年度2008 - 2008
委託先名東海カーボン株式会社 独立行政法人産業技術総合研究所
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.研究開発の内容および成果等
平成20年度は粒子径の大きな炭素微小球(CNS)を用い、電気化学特性の評価、被膜-炭素構造に関連する粒子径依存性についての検討を行った。試料は、500nm、 700nm級および1μm級の粒径を有するCNS試料をAr気流下で熱処理した試料を用いた。
英文要約Title:Research and development of carbon nanospheres for energy storage devices in next generation (FY2007-FY2009)FY2008 Annual Report
As for negative electrode of Lithium Ion Battery, by using Carbon Nanoshere (CNS) whose particles are larger, the evaluation of electrochemical characteristics and the particle diameter dependence associated with film-carbon structure were examined. CNS samples of 500nm, 700nm and 1000nm were prepared by heat-treated under Ar gas current. Graphitizated 700nm CNS achieved 91% of initial Coulomb efficiency and 280mAh/g of capacity, and it was found that not only the particle size but the heat treatment temperature gives to electrochemical characteristics large influence. For the study of battery design for high power, electrochemical characteristics in PC electrolytes were examined at 700nm and 1000nm CNS since the use of propylene carbonate (PC) electrolytes is desirable for high power at low temperature, and it was found that CNS has tolerance for PC electrolytes. In addition, 700nm CNS showed limited diffusion behavior and very superior cycle characteristics. In the examination of particle diameter dependence of the film-carbon structure, TEM and SEM observation, XRD measurement and Raman spectrometry were carried out. The graphitization structures developed from the surface to half of particle center in 700nm and 1000nm CNS which heated at 2000℃. Since the graphitization structure was undeveloped in 200nm CNS at the same temperature treatment, it cleared that the larger the diameter of CNS is, the lower temperature graphitization is developed. On the other hand, as for the graphitized CNS, structure defect concentrates on the vicinity of an edge formed by polygonization, and it is estimated that these structure defects work as the passes of the Li ion similarly with a defect on the plane of the particle, Furthermore, a film of the thickness uniformity (0.8-1nm) was confirmed on the surface when the surfaces of CNS after charge and discharge examination were observed by TEM. In addition, at some conditions of charge and discharge, the states which the fine film was formed after first charge and discharge, exfoliation of graphitized surface layer, and regenerated SEI to cover the carbon net side exfoliated partially were observed, and these can be connected with the deterioration mechanism of the carbon negative electrode in the PC electrolyte. In the future, the basic examinations including the possibility of industrialization will be carried out.
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