Abstract
Despite the prevailing dominance of lithium-ion batteries in consumer electronics and electric vehicle
markets, the growing apprehension over lithium availability has ignited a quest for alternative high-
energy-density electrochemical energy storage systems. Rechargeable batteries featuring calcium (Ca)
metal as negative electrodes (anodes) present compelling prospects, promising notable advantages in
energy density, cost-effectiveness, and safety. However, unlocking the full potential of rechargeable Ca
metal batteries particularly hinges upon the strategic identification or design of high-energy-density pos-
itive electrode (cathode) materials. This imperative task demands expeditious synthetic routes tailored
for their meticulous design. In this Perspective, we mainly highlight the development in the cathode ma-
terials for calcium batteries and accentuate the unparalleled promise of solid-state metathesis routes in
designing a diverse array of high-performance electrode materials.