Synthesis and Electrode Performance of Li4MoO5 LiFeO2 Binary System as Positive Electrode Materials for Rechargeable Lithium Batteries
A binary system, x Li4MoO5 (1 x) LiFeO2, is studied as electrode materials for rechargeable lithium batteries. A sample of single phase is obtained at x 0.5, and it is found that Li1.42Mo0.29Fe0.29O2 (x 0.5) crystalizes into Li5ReO6 type structure. Although an initial charge capacity of Li1.42Mo0.29Fe0.29O2 reaches 350mAhg 1, irreversible phase transition associated with oxygen loss andmolybdenummigration on charge is evidenced by X ray diffraction and X ray absorption spectroscopy. The irreversible phase transition inevitably results in large polarization on discharge as electrode materials in Li cells. These findings provide the basis for the development of high capacity electrode materials with solid state redox reaction of oxide ions. (c) The Electrochemical Society of Japan, All rights reserved.