| 摘要 |
PURPOSE:To reduce the internal resistance of a cell and improve the discharge characteristic by specifying the grain sizes of lead bismuthate as the active material in a positive electrode black mix and graphite as a conductive agent. CONSTITUTION:A nonaqueous electrolyte cell is formed with a negative electrode active material made of an alkali metal such as lithium and a positive electrode black mix using lead bismuthate as a positive electrode active material and containing 0.05-2wt% of graphite against the positive electrode black mix quantity as a conductive agent. In this case, the grain size of lead bismuthate used as the positive electrode active material is specified to 10-100mu, and the grain size of graphite used as the conductive agent is specified to 50% or less of that of lead bismuthate. The lead bismuthate specified for its grain size allows excellent diffusion of the electrolyte in the positive electrode black mix, and it exists in a state giving the reaction area within the maximum limit. In addition, the graphite of this grain size is well mingled with the grains of lead bismuthate. Accordingly, the electric conductivity in the positive electrode black mix can be extracted to the maximum extent. |
