Influence of void-size distribution of anode film made of natural graphite particles on high rate discharge capability of lithium-ion battery

The relationship was experimentally investigated between void-size distribution of anode film made of natural graphite particles for lithium-ion batteries and high rate discharge capability. The high rate discharge capability improved, as the modal void diameter increased. Thus, it was considered that lithium-ion diffuses in the electrolyte liquid penetrating through the voids among the particles in the electrode film due to the gradient of lithium-ion concentration. While, the modal diameter of voids increased for graphite powders of higher tapping density. Therefore, it was found that the tapping density was a useful indicator for the graphite particles to yield the film of high rate discharge capability in practical use.