• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1994 Fiscal Year Final Research Report Summary

Preparation of Cathode Active Materials for High Energy Density Lithium Secondary Battery and Their Characteristics for Batteries.

Research Project

Project/Area Number 05650834
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 工業物理化学
Research InstitutionKanagawa University

Principal Investigator

SATO Yuichi  Kanagawa University, Professor, 工学部, 教授 (20201535)

Co-Investigator(Kenkyū-buntansha) KOBAYAKAWA Koichi  Kanagawa University, Research Associate, 工学部, 助手 (40078332)
Project Period (FY) 1993 – 1994
KeywordsLithium Secondary Battery / Cathode Active Material / Vanadium Pentoxide / Nickel Oxide / In Situ XRD / Electrolytic Preparation / Ozone Oxidation Method / Chemical Diffusion Coefficient
Research Abstract

As a cathode active materials for lithium secondary batteries, V_2O_5 and LiNiO_2 are the most promising materials among the candidates.
1) Electrochemically prepared V_2O_5 (e-V_2O_5) from a VOSO_4 solution showed an intermediate crystal structure and electrochemical behavior between crystalline V_2O_5 (c-V_2O_5) and amorphous V_2O_5-P_2O_5 (a-V_2O_5-P_2O_5). V_2O_5 prepared by the ozone oxidation method (O_3-V_2O_5) showed almost the same characteristics as those of e-V_2O_5. The discharge capacities of e-and O_3-V_2O_5 are both about 250-260 mAh/g for ten cycles, when the cut-off voltage is 2.0 V.These values are higher than those for c-V_2O_5 and a-V_2O_5-P_2O_5. The chemical diffusion coefficient change of Li^+ in the cathode material (D) for four types of V_2O_5 was measured at various discharge stages by galvanostatic intremittent technique and AC technique. In the case of c-V_2O_5, D changed dramatically as discharge progressed. This behavior coincided with the literature and was supported by in situ XRD measurements. D of a -V_2O_5-P_2O_5 did not change so much, which suggests the structure is resistant to its destruction by Li^+ insertion. The change in D for e-and O_3-V_2O_5 is not very large compared to that of c-V_2O_5 till about x=0.8, after which the D values decreased.
2) To increase the capacity and cycleability of LiNiO_2, Fe, Mg, and In were added to prepare LiFe_xNi_<1-x>O_2, LiMg_xNi_<1-x>O_2 and LiIn_xNi_<1-x>O_2. In the case of Fe and Mg addition, the capacity decreased, whereas in the case of In, the capacity of LiIn_<0.005>Ni_<0.995>O_2 increased to 168 mAh/g which is larger compared to 164 mAh/g for LiNiO_2 and cycleability was also improved. In seems to act as a structure stabilizer in LiNiO_2.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Yuichi Sato: "Charge-discharge characteristics of V_2O_5 prepared by electrochemical and ozone oxidation method as a cathode active material for lithium secondary battery" Proc.Symp.New Sealed Rechageable Batteries and Supercapacitors. PV-93-23. 423-430 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yuichi Sato: "The preparation of V_2O_5 by ozone oxidation of VOSO_4 solution for cathodic active material of lithium secondary battery" Chemistry Letters. 901-904 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yuichi Sato: "Secondary Battery Materials,Japanese R&D Trend Analysis,Advanced Materials-Phase VI,No.10," Kansai Research Institute(KRI), 211 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Sato, N.Matsueda, H.Tokugawa and K.Kobayakawa: "The Preparation of V_2O_5 by Ozone Oxidation of VOSO_4 Solution for Cathode Active Material of Lithium Secondary Battery." Chem.Lett.901-904 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Sato, N.Matsueda, H.Tokugawa and K,Kobayakawa: "Charge-Discharge Characteristics of V_2O_5 Prepared by Electrochemical and Ozone Oxidation Method as a Cathode Active Materal for Lithium Secondary battery." Proceedings of the Symposium on New Sealed Rechargeable Batteries and Supercapacitors ed.B.M.Barnet, E.Dowgiallo, G.Halpert, Y,Matsuda and Z-i.Takehara (The Electrochem.Soc.). 93-23. 423-430 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Sato: "Secondary Battery Materials" Japanese R & D Trend Analysis, Advanced Materials-Phase VI (Kansai Research Institute (KRI)). No.10. 1-211 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 1996-04-15  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi