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 LiNi 0.90 Co 0.04 Mn 0.03 Al 0.03 O 2 induced by the lithium ion conductor Li 0.34 La 0.56 TiO 3 and over-lithiated oxide Li 2 NiO 2 double coverings. The influence of various covering materials on particles morphology, crystal structure and electrochemical properties have been explored. It is found that the Li 0.34 La 0.56 TiO 3 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 Li 2 NiO 2 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 Li 0.34 La 0.56 TiO 3 coating deliver the obvious enhanced rate capability, superior discharging capacity at low temperature and more stable cyclic performance than those of pristine LiNi 0.90 Co 0.04 Mn 0.03 Al 0.03 O 2. Besides, the Li 0.34 La 0.56 TiO 3 and Li 2 NiO 2 co-coated sample demonstrates the superior safety performance and cyclic stability when applied in the pouch battery in comparison with the pristine cathode. [Display omitted] • Li 0.34 La 0.56 TiO 3 and Li 2 NiO 2 co-covering is adopted to enhance LiNi 0.90 Co 0.04 Mn 0.03 Al 0.03 O 2. • Li 0.34 La 0.56 TiO 3 layer could maintain the morphology and structure stability. • Li 2 NiO 2 could compensate the irreversible active Li+ loss. • Li 0.34 La 0.56 TiO 3 and Li 2 NiO 2 co-coated cathode delivers the superior safety and cyclic stability. [ABSTRACT FROM AUTHOR]