Electrochemical performance of nano-sized ZnO-coated LiNi0.5Mn1.5O4 spinel as 5 V materials at elevated temperatures

ZnO-coated LiNi0.5Mn1.5O4 powders with excellent electrochemical cyclability and structural stability have been synthesized. The electrochemical performance and structural stability of ZnO-coated LiNi0.5Mn1.5O4 electrodes in the 5 V region at elevated temperature has been studied as function of the level of ZnO coating. The 1.5 wt% ZnO-coated LiNi0.5Mn1.5O4 electrode delivers all initial discharge capacity of 137 mAh g(-1) with excellent cyclability at elevated temperature even at 55degreesC. The reason for the excellent cycling performance of ZnO-coated LiNi0.5Mn1.5O4 electrode is largely attributed to ZnO playing an important role of HF getting in the electrolyte. (C) 2002 Published by Elsevier Science B.V.