Surface Modification of High Voltage Spinel LiNi0.5Mn1.5O4 Cathode Material Manufactured via Co-precipitation

Abstract

Spinel-structured LiNi0.5Mn1.5O4 (LNMO) can provide high energy density due to its high operating voltage of 4.7 V. LNMO materials synthesized through co-precipitation are suitable for commercialization because of their easily controllable particles and structure. However, their practical application is difficult due to electrolyte and surface-side reactions. In this study, TiO2 was coated with LNMO using the sol–gel method to evaluate its electrochemical properties and thermal stability. Consequently, the TiO2 coating improved the rate performance and long-term battery cycling. Additionally, the cycling characteristics at high temperatures were improved by enhancing the thermal stability of the charged LNMO particles.