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This study examined the electrochemical and structural stability of. 1.5 wt.% AlPO4-coated LiNi0.9Co0.1O2. The AlPO4-coatedLiNi0.9Co0.1O2 retained. 60% of the original capacity after 50 cycles, compared with the. 0.9-Co0.1O2. The discharge proles and cyclic voltammograms from 4.5 V at 90.C for 4 h showed enhanced structural stability. Scanningelectron microscopy and X-ray diraction revealed that the AlPO4-coated LiNi0.9Co0.1O2 had less degradation than the bareLiNi0.9Co0.1O2.