High-energy LiNi0.90Co0.04Mn0.03Al0.03O2 cathode material with lithium-reactive Li0.34La0.56TiO3 coating and Li2NiO2 lithium supplying for enhanced performance lithium-ion batteries

In the work, we have focused on the surface variations of the LiNi0.90Co0.04Mn0.03Al0.03O2 induced by the lithium ion conductor Li0.34La0.56TiO3 and over-lithiated oxide Li2NiO2 double coverings. The influence of various covering materials on particles morphology, crystal structure and electrochemical properties have been explored. It is found that the Li0.34La0.56TiO3 firm layer could reduce the catalytic decomposition of electrolyte and further maintain the stable particles morphology and crystal structure of cathode after long-term cycling. In addition, the Li2NiO2 served as the lithium supplement additive could compensate the irreversible active lithium ions loss during cycling and then relieve the cyclic capacity attenuation. Comparatively, the cathodes after Li0.34La0.56TiO3 coating deliver the obvious enhanced rate capability, superior discharging capacity at low temperature and more stable cyclic performance than those of pristine LiNi0.90Co0.04Mn0.03Al0.03O2. Besides, the Li0.34La0.56TiO3 and Li2NiO2 co-coated sample demonstrates the superior safety performance and cyclic stability when applied in the pouch battery in comparison with the pristine cathode.