Enhanced Electrochemical Performance of LiNi0.8Co0.1Mn0.1O2 Cathode Material for lithium ion batteries by WO3 surface coating

LiNi0.8Co0.1Mn0.1O2 cathode material was successfully modified by using a wet-chemical route to coat WO3. The microstructures, morphologies, crystal structures, elemental distributions and ionic valence of the prepared cathode materials were carefully analyzed by SEM, EDS, TEM, HRTEM, XRD and XPS. The results indicated that the surface of LiNi0.8Co0.1Mn0.1O2 was uniformly covered by WO3 particles, and a small amount of W6+ could enter to the lattice of LiNi0.8Co0.1Mn0.1O2. The WO3 coating could prohibit the corrosion of HF and some side reactions for the cathode material during long cycles, thus greatly improving the electrochemical performance and the structural stability of LiNi0.8Co0.1Mn0.1O2. Among the examined LiNi0.8Co0.1Mn0.1O2 cathode materials, 1.0 wt% WO3-coated LiNi0.8Co0.1Mn0.1O2 has the best initial discharge capacity (185.1 mAh g(-1)) and an excellent capacity retention (93.2%) after 100 cycles at 1 C.