Enhanced high-temperature cycling of Li2O-2B2O3-coated spinel-structured LiNi0.5Mn1.5O4 cathode material for application to lithium-ion batteries

A Li2O-2B2O3-glass-coated LiNi0.5Mn1.5O4 (LNMO) cathode active material (GC-LNMO) was synthesized to enhance the thermal stability of LNMO-based electrodes for lithium-ion batteries. The morphologies of the surface-coating layers were analyzed using transmission electron microscopy. The glass coating prevented the surface of the LNMO-based electrode from being directly exposed to the liquid electrolyte solution, preventing Mn at the electrode surface from dissolving into the electrolyte and thus preventing the cell impedance from increasing through the undesirable formation of a cathode-electrolyte-interphase layer and the development of facile charge transfer kinetics during cycling. The electrochemical performance measurements demonstrated that the GC-LNMO-based electrode exhibited remarkably enhanced electrochemical reversibly and stability at elevated temperature (60 degrees C). (C) 2014 Elsevier B.V. All rights reserved.