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

Spinel-structured LiNi 0.5 Mn 1.5 O 4 (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, TiO 2 was coated with LNMO using the sol–gel method to evaluate its electrochemical properties and thermal stability. Consequently, the TiO 2 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.