All solid-state lithium-ion cathode

A method of preparing a positive active material layer, the method comprising:

• providing a mixture comprising a first particle having a first mean particle diameter (D1) of between 1 micrometer and 50 micrometers, a second particle having a second mean particle diameter (D2) between 1 micrometer to 50 micrometers;
• combining the mixture with a conductive agent and a solid electrolyte having a mean particle diameter (DSE) of 0.1 micrometers to 12 micrometers to form a positive active material precursor;
• and
• compacting the positive active material precursor at 50 megapascals to 500 megapascals to form the positive active material layer,
• wherein a positive active material in the positive active material layer comprises a plurality of particles having multi-modal particle size distribution, wherein the multi-modal particle size distribution comprises a first particle size distribution having a first mean particle diameter and a second particle size distribution having a second mean particle diameter.