A composite electrode for use in an all-solid-state electrochemical cell that cycles lithium ions is provided. The composite electrode comprises a solid-state electroactive material that undergoes volumetric expansion and contraction during cycling of the electrochemical cell and a solid-state electrolyte. The solid-state electroactive material is in the form of a plurality of particles and each particle has a plurality of internal pores formed therewithin. Each particle has an average porosity ranging from about 10% to about 75%, and the composite electrode has an interparticle porosity between the solid-state electroactive material and solid-state electrolyte particles ranging from about 5% to about 40%. The intraparticle pores and the interparticle porosity accommodate the volumetric expansion and contraction of the solid-state electroactive material so to minimize outward expansion of the electroactive particles, micro-cracking of the solid-state electrolyte, and delamination within the electrochemical cell.