Abstract
The aim of this study is to evaluate the binderless process for manufacturing positive electrodes for primary batteries. Composite particles for positive electrodes were prepared by dry-coating manganese dioxide with graphite using a high-performance planetary mill; particle size distribution and composite particle fluidity were measured. The particles were then compression-molded into tablets whose electric resistance and density were measured.
The measurements have proven that positive electrodes with low electric resistance and high density can be produced by compression-molding composite particles properly prepared by the dry-coating process, i.e., without using binder. Experiments were also carried out to clarify the optimal processing time for composite particles, as well as optimal particle size and centrifugal acceleration, that yields composite particles with superior electric resistance and density, most suitable for positive electrodes. It has also been verified that the electric resistance and density of positive electrodes produced by this binderless dry process are equal or superior to those attained by the conventional wet process.
