This study examined the electrochemical and structural stability of similar to 1.5 wt.% AlPO4-coated LiNi0.9Co0.1O2. The AlPO4-coated LiNi0.9Co0.1O2 retained similar to 60% of the original capacity after 50 cycles, compared with the similar to 30% capacity retention of the bare LiNi0.9Co0.1O2. The discharge profiles and cyclic voltammograms from 4.5 V at 90 degrees C for 4 h showed enhanced structural stability. Scanning electron microscopy and X-ray diffraction revealed that the AlPO4-coated LiNi0.9Co0.1O2 had less degradation than the bare LiNi0.9Co0.1O2. (c) 2006 Elsevier B.V. All rights reserved.