Preparation of Particles of Electroactive Transition Metal Compounds

• Project/Area Number: 20710090
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Nanomaterials/Nanobioscience
• Research Institution: Yokohama National University
• Principal Investigator: DOKKO Kaoru Yokohama National University, 工学研究院, 准教授 (70438117)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2009: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2008: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: ナノ粒子 / 水熱合成 / リチウム二次電池 / ナノ材料 / リチウム電池

Research Abstract

The olivine-type compound LiMnPO_4 was prepared via a reaction between Li_3PO_4 and a MnSO_4 aqueous solution under hydrothermal conditions at 190℃. The specific surface area and particle morphology of LiMnPO_4 changed depending on the amount of water in the reaction mixtures, and the particle size decreased as the amount of water decreased. It was found that nanosized LiMnPO_4 particles of ca. 50nm can be prepared through the reaction between Li_3PO_4 and the molten aqua-complex of MnSO_4・nH_2O (n=4 or5). Galvanostatic charge and discharge tests revealed that the electrochemical reactivity of LiMnPO_4 at 30℃ increased as the particle size decreased. The small particle size contributes to the decrease in the overpotential for Mn^<2+/3+> redox and to the increase in the utilization of LiMnPO_4 as an active material in the cathode of lithium batteries.

Research Products

• [Journal Article] リチウム二次電池活物質マイクロ粒子の電気化学特性 (2010)
  • Author(s): 獨古薫
  • Journal Title: セラミックス 45巻 Pages: 172-175
  • NAID: 10026241067
• [Journal Article] リチウム二次電池活物質マイクロ粒子の電気化学特性 (2010)
  • Author(s): 濁古薫
  • Journal Title: セラミックス Volume: 45 Pages: 172-175
• [Journal Article] 球状LiMn2O4を用いた焼結式多孔性電極の電気化学特性の評価 (2009)
  • Author(s): 菅野裕士, 丸山剛, 獨古薫, 金村聖志
  • Journal Title: 電気化学および工業物理化学 77巻 Pages: 309-314
  • Peer Reviewed
• [Journal Article] High Rate Discharge Capability of Single Particle Electrode of LiCoO2 (2009)
  • Author(s): K. Dokko, N. Nakata, K. Kanamura
  • Journal Title: Journal of Power Sources 189巻 Pages: 783-785
  • Peer Reviewed
• [Journal Article] 球状LiMn2O4を用いた焼結式多孔性電極の電気化学特性の評価 (2009)
  • Author(s): 獨古薫
  • Journal Title: 電気化学および工業物理化学 77 Pages: 309-314
  • Peer Reviewed
• [Journal Article] High Rate Discharge Capability of Single Particle Electrode of LiCoO2 (2009)
  • Author(s): 獨古薫
  • Journal Title: Journal of Power Sources 189 Pages: 783-785
  • Peer Reviewed
• [Journal Article] 電気化学材料に対する水熱合成法の可能性と期待 (2008)
  • Author(s): 獨古薫, 金村聖志
  • Journal Title: 電気化学および工業物理化学 76巻 Pages: 691-695
  • NAID: 10021369530
• [Journal Article] Hydrothermal Synthesis of Carbon-Coated LiFePO4 and Its Application to Lithium Polymer Battery (2008)
  • Author(s): H. Nakano, K. Dokko, S. Koizumi, H.Tannai, K. Kanamura
  • Journal Title: Journal of The Electrochemical Society 155巻
  • Peer Reviewed
• [Journal Article] 電気化学材料に対する水熱合成法の可能性と期待 (2008)
  • Author(s): 獨古薫
  • Journal Title: 電気化学および工業物理化学 76 Pages: 691-695
  • NAID: 10021369530
• [Journal Article] Hydrothermal Synthesis of Carbon-Coated LiFePO4 and Its Application to Lithium Polymer Battery (2008)
  • Author(s): 獨古薫
  • Journal Title: Journal of The Electrochemical Society 155
  • Peer Reviewed
• [Presentation] 溶融アクア錯体を用いたLiMnPO4系正極材料の合成 (2011)
  • Author(s): 獨古薫, 八田剛志, 渡邉正義
  • Organizer: 電気化学会第78回大会
  • Place of Presentation: 横浜
  • Year and Date: 2011-03-30
• [Presentation] 水熱法によるLiMnPO4 系正極材料の合成 (2010)
  • Author(s): 八田剛志, 獨古薫, 渡邉正義
  • Organizer: 第51回電池討論会
  • Place of Presentation: 名古屋
  • Year and Date: 2010-11-10
• [Presentation] 水熱法によるLiMnPO4系正極材料の合成 (2010)
  • Author(s): 濁古薫
  • Organizer: 第51回電池討論会
  • Place of Presentation: 名古屋
  • Year and Date: 2010-11-10
• [Presentation] Carbon Coating on LiMPO4 (M = Fe, Mn) Particles by Hydrothermal Method (2008)
  • Author(s): S. Koizumi, K. Dokko, K. Kanamura
  • Organizer: 214th Meeting of The Electrochemical Society
  • Place of Presentation: Honolulu, Hawaii, USA.
  • Year and Date: 2008-10-14
• [Presentation] Carbon Coating on LiMPO4 (M=Fe,Mn) Particles by Hydrothermal Method (2008)
  • Author(s): 獨古薫
  • Organizer: 214th Meeting of The Electrochemical Society
  • Place of Presentation: Honolulu, Hawaii, USA
  • Year and Date: 2008-10-14
• [Presentation] リチウム二次電池の高出力化と電極材料の研究開発 (2008)
  • Author(s): 獨古薫
  • Organizer: 第69回応用物理学会学術講演会
  • Place of Presentation: 愛知県春日井市, 中部大学
  • Year and Date: 2008-09-04
• [Presentation] リチウム二次電池の高出力化と電極材料の研究開発 (2008)
  • Author(s): 獨古薫
  • Organizer: 第69回応用物理学会学術講演会
  • Place of Presentation: 愛知県春日井市,中部大学
  • Year and Date: 2008-09-04