JPS6463266A - Thin cell - Google Patents

Abstract

PURPOSE:To increase positive black application weight as well as to make the capacity improvable without changing thickness of a thin cell by mixing electrolytic manganese dioxide and chemical manganese dioxide with a positive active material at a rate ranging from 1:1 to 1:5. CONSTITUTION:A positive active material 2 and a negative active material 3 are set up between a positive collector 1 and a negative collector 6 via a separator 4 impregnating an electrolyte. As for the positive active material 2, electrolytic manganese dioxide and chemical manganese dioxide are mixed at a rate ranging from 1:1 to 1:5. That is to say, means grain size of the electrolytic manganese dioxide is one-fourth or so to that of the chemical manganese dioxide, so that electrolytic manganese dioxide 11 small in grain size gets into space between chemical manganese dioxide 10 themselves large in the grain size, thus the space where these manganese dioxide fine grains 10 themselves cannot come into contact directly is minimized. Consequently, open circuit voltage is made so as to exceed a range of 1.5V with the chemical manganese dioxide excellent in light load discharge capacity, and that electrolytic manganese dioxide is mixed so as to minimize the space where these manganese dioxide fine grains themselves cannot be directly contacted.