| 摘要 |
PURPOSE:To obtain a positive active material for organic electrolyte battery having good performance in high rate discharge and high temperature storage by forming a thin conductive film of lithium tungstate on the surface of positive active material. CONSTITUTION:A positive active material is immersed and stirred in a aqueous solution of lithium tungstate (Li2WO4), and dried to vaporize moisture, then heated. By this process, a thin layer of Li2WO4 having conductivity is formed on the surface of the active material. Since the surface of the active material is covered with the thin electron conductive layer, addition of conductive material is eliminated, and no gas evolves even when discharge voltage decreased to about 1V. In addition, dissolution of the active material and decrease in capacity are also retarded. Since Li2WO4 or WO3 is lithium ion conductive, diffusion of lithium ion into the active material is no problem. |
