Understanding Electrochemical Properties of LiNiO₂ as a Cathode for Lithium-Ion Batteries

Cathode materials have been developed toward having high energy density and low cost with decreasing cobalt and increasing nickel. However, as Ni content increases, structural and electrochemical stabilities become poor. Cathode materials exhibit a trade-off relation between capacity and stability. It is challenging to break the trade-off relationship because ‘high capacity’ generally accompanies high structural and volumetric change. However, both properties are important to utilize materials. Recently single crystal cathodes are paid attention to solve the issue. Here, we synthesized single crystal LiNiO₂ and investigated the electrochemical properties depending on surface planes, crystal sizes and anti-site defects. Its impact will be addressed in this presentation.