The study of cathode materials with a highly controlled microstructure for secondary lithium-battery systems

• Project/Area Number: 18550171
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Functional materials/Devices
• Research Institution: National Institute for Materials Science
• Principal Investigator: OZAWA Kiyoshi National Institute for Materials Science, 光触媒材料センター, 主幹研究員 (90343855)
• Co-Investigator(Kenkyū-buntansha): FUJII Hiroki 独立行政法人物質・材料研究機構, 超伝導材料センター, 主幹研究員 (80354306)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥4,400,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥600,000); Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2007: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2006: ¥1,800,000 (Direct Cost: ¥1,800,000)
• Keywords: 微細構造制御 / 正極材 / リチウム二次電池 / 化学溶液法 / リチウムニ次電池

Research Abstract

リチウム二次電池の電池特性の向上を目指し、LiVO_2(R3^^-m)およびLiFePO_4を正極材の活物質に選び、水熱法とコロイドプロセスの手法を組み合わせた新しい化学溶液法を用いて、正極材内部の微細構造制御を行った。前者では新規にLi_<0.86>V_<0.8>O_2が得られ、後者ではカーボンが一様に分布した正極材を得ることができた。これらは従来のものよりも優れた充放電特性を示した。

Research Products

• [Journal Article] Fabrication of novel composite of ZnO-nanoparticles and magadiite (2009)
  • Author(s): K. Ozawa, Y. Nakao, Z. X. Cheng, D. Wang, M. Osada, R. Okada, K. Saeki, H. Itoh, and F. Iso
  • Journal Title: Mater. Lett. 63 Pages: 366-369
  • Peer Reviewed
• [Journal Article] Fabrication of novel composites of ZnO-nanoparticles and magadiite (2009)
  • Author(s): Kiyoshi Ozawa
  • Journal Title: Materials Letters 63 Pages: 366-369
  • Peer Reviewed
• [Journal Article] Preparation and characterization of Ag-magadiite nanocomposites (2007)
  • Author(s): K. Ozawa, F. Iso, Y. Nakao, Z. X. Cheng, H. Fujii, M. Hase, and H. Yamaguchi
  • Journal Title: J. Eur. Ceram. Soc. 27 Pages: 2665-2669
  • Peer Reviewed
• [Journal Article] Fabrication, Raman spectra and ferromagnetic properties of the transition metal doped ZnO nanocrystals (2007)
  • Author(s): Z. X. Cheng, X. L. Wang, S. X. Dou, K. Ozawa, H. Kimura, and P. Munroe
  • Journal Title: J. Phys. D: Appl. Phys. 40 Pages: 6518-6521
  • Peer Reviewed
• [Journal Article] The effect of Sic addition on the superconducting properties of MgB2 tapes fabricated through an ex situ process using chemically treated powder (2007)
  • Author(s): H. Fujii, K. Togano, H. Kumakura, and K. Ozawa
  • Journal Title: Supercond. Sci. Technol. 20 Pages: 579-583
  • Peer Reviewed
• [Journal Article] Structural modifications caused by electrochemical lithium extraction for two types of layered LiVO2 (R3m) (2007)
  • Author(s): K. Ozawa, Y. Nakao, L. Wang, Z. X. Cheng, H. Fujii, M. Hase, and M. Eguchi
  • Journal Title: J. Power Sources 174 Pages: 469-472
  • Peer Reviewed
• [Journal Article] Lithium insertion property of Li2.2V2O5・nH2O, Electrochim (2007)
  • Author(s): M. Eguchi and K. Ozawa
  • Journal Title: Acta 52 Pages: 2657-2660
  • Peer Reviewed
• [Journal Article] Structural modifications caused by electrochemical lithium extaction for two types of layered LiVO_2(R3m) (2007)
  • Author(s): Kiyoshi Ozawa
  • Journal Title: Journal of Power Sources 174 Pages: 469-472
  • Peer Reviewed
• [Journal Article] Preparation and characterization of Ag-magadiite nanocomposites (2007)
  • Author(s): Kiyoshi Ozawa
  • Journal Title: Journal of the European Ceramic Society 27 Pages: 2665-2669
• [Journal Article] Lithium insertion property of Li_<2.2>V_2O_5・nH_2O (2007)
  • Author(s): Mika Eguchi
  • Journal Title: Electrochimica Acta 52 Pages: 2657-2660
• [Presentation] (2009)
  • Author(s): 佐伯和彦, 小澤 清, 岡田礼佳, 伊藤裕恭, 磯 文夫
  • Organizer: 日本セラミックス協会2009年年会
  • Place of Presentation: 野田市, 日本
• [Presentation] Hydrothermal Preparation and Electrochemical Properties of LiCoO_2 nanoparticles (2008)
  • Author(s): Kiyoshi Ozawa
  • Organizer: International Conference on Nanoscience&Nanotechnology
  • Place of Presentation: Melbourne,Australia
  • Year and Date: 2008-02-26
• [Presentation] ZnO-マガディアイトナノコンポジットの作製 (2008)
  • Author(s): 小澤 清, 岡田礼佳, 伊東裕恭, 磯 文夫
  • Organizer: 日本セラミックス協会2008年年会
  • Place of Presentation: 長岡市, 日本
• [Presentation] Hydrothermal Preparation and Electrochemical Properties of LiCoO2 Nanoparticles (2008)
  • Author(s): K. Ozawa, Y. Nakao, L. Wang, Z. X. Cheng
  • Organizer: International Conference on Nanoscience & Nanotechnology
  • Place of Presentation: Melbourne, Australia
• [Presentation] マガディアイト化合物の層間を利用した機能性ナノコンポジットの作製 (2006)
  • Author(s): 小澤 清, 磯 文夫, 藤井宏樹, 渡辺雄二郎, 山口仁志
  • Organizer: 日本セラミックス協会第19回秋季シンポジウム
  • Place of Presentation: 甲府市, 日本
• [Presentation] Lithium insertion and extraction properties of two types of the layered LiVO2 (2006)
  • Author(s): K. Ozawa, H. Fujii, M. Hase, M. Eguchi, K. Uno
  • Organizer: International Meeting on Lithium Batteries (IMLB 2006)
  • Place of Presentation: Biarritz, France
• [Book] エレクトロニクス用セラミックスの製造プロセスと応用技術 (2007)
  • Author(s): 小澤 清, 木村秀夫 (共同執筆)
  • Publisher: 技術情報協会