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STUDIES ON MODIFICATION OF LITHIUM MANGANATE PARTICLE SURFACE FOR LITHIUM ION BATTERY WITH METAL OXIDE

Research Project

Project/Area Number 10650828
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 無機工業化学
Research InstitutionOKAYAMA UNIVERSITY

Principal Investigator

TORI Isao  OKAYAMA UNIVERSITY, FAC. ENGINEERING, PROFESSOR, 工学部, 教授 (00026014)

Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsLithium manganate / Cycling characteristics / Modification / リチウム電池
Research Abstract

In order to remarkably improve the charge-discharge cycling characteristics at temperatures above 50ィイD1゜ィエD1C of LiMnィイD22ィエD2OィイD24ィエD2 as a positive electrodematerial of lithium ion battery, the oxide was partially modified with cobalt (III) oxide at the particle surface. The method for the modification was as follows : dispersing electrolytic manganese dioxide powder (EMD) in aqueous solution of cobalt (II) nitrate, adding sodium hydroxide solution to it to prepare the powder coated with cobalt hydroxide which was oxidized by oxygen in air, separating the powder from the solution, mixing lithium compounds and the powder at the ratio of (Mn+Co) : Li=2 : 1 and then heating the mixture at 470ィイD1゜ィエD1C for 6h, followed by further heating at 750ィイD1゜ィエD1C for 20h to prepare LiCoィイD2yィエD2MnィイD22-yィエD2OィイD24ィエD2 (y=0.04, 0.08, and 0.16). The samples obtained were confirmed to have spinel structure by XRD and a large part of cobalt (III) ions were found to exist preferentially at the powd … More er surface by EDX analysis. Small amount of the ions were thought to be in the inner part of the particles in dilute concentration due to thermal diffusion of the ions. The samples of LiCoィイD2yィエD2MnィイD22-yィエD2OィイD24ィエD2 were tested on the charge-discharge cycling characteristics at 30 and 60ィイD1゜ィエD1C. Comparison of the characteristics at 30ィイD1゜ィエD1C showed that modification yielded remarkably improved charge-discharge performance, though that of LiMnィイD22ィエD2OィイD24ィエD2 did such a performance that discharge capacity considerably decreased with charge-discharge cycling. But the characteristics at 60ィイD1゜ィエD1C showed that even the modified samples did not provide good performance. In order to change the distribution of cobalt ion in the oxides, LiCoィイD2yィエD2MnィイD22-yィエD2OィイD24ィエD2 samples were heated at 900ィイD1゜ィエD1C for 30m. The samples obtained also did not provide good performance. As a further experiment the surface of EMD was treated using ferrous ion, nickel ion and magnesium ion instead of cobalt ion, and lithium manganate powders including these ions were synthesized. As a result of examining the charge-discharge cycling characteristics of LiMィイD20ィエD2MnィイD21・84ィエD2OィイD24ィエD2 (M=Fe, Ni, Mg) at 60ィイD1゜ィエD1C LiNiィイD20・16ィエD2MnィイD21・84ィエD2OィイD24ィエD2 provided an excellent characteristics. It was found that modification of LiMnィイD22ィエD2OィイD24ィエD2 powder with nickel oxide at the particle surface remarkably improves the charge-discharge cycling characteristics at higher temperature. Less

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] 姜東彪,小郷義久,田里伊佐雄: "低温電解による電解二酸化マンガンを用いたリチウム一次電池の放電特性"電気化学. 66・11. 1123-1127 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 姜東彪,小郷義久,田里伊佐雄: "LiMn_2O_4粉の表面処理の充放電特性への影響I.Ag被覆"電気化学. 67・4. 359-363 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Dong Biao Jiang, Yoshihisa Kogo and Isao Tari,: "Preparation of Electroltic Manganese Dioxide at Low Temperature and Its Discharge Characteristics as a Cathode Material of Lithium Primary Cell"DENKI KAGAKU. 66. 1123-1127 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Dong Biao Jiang, Yoshihisa Kogo and Isao Tari,: "Influence of Surface Treatment of LiMnィイD22ィエD2OィイD24ィエD2 Powder with Ag on Charge-Discharge Characteristics I. Ag Coating"DENKI KAGAKU. 67. 359-363 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 姜東彪,小郷義久,田里伊佐雄: "LiMn_2O_4粉の表面処理の充放電特性への影響I.Ag被覆"電気化学. 67・4. 359-363 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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