Authors

Abstract

Ni-rich LiNi1-xCox/2Mnx/2O2 layered materials have been widely adopted as cathodes for currentelectric vehicles (EVs) due to their high gravimetric and volumetric energy densities. However,their high-voltage instability (e.g., > 4.3 VvsLi) limited their usage corresponding to about 60 70 %of their theoretical capacities. The major problems of high-voltage operation stem from instabilityof Ni3+/4+ in NMC in contact with electrolytes at cathode-electrolyte interphase (CEI). Here wepropose garnet-type Li6.7La3Zr1.7Ta0.3O12 (LLZT) solid-electrolyte blended LiNi0.6Mn0.2Co0.2O2(NMC) as high-voltage stable cathodes. The LLZT not only passivates the CEI but scavengesprotons and moisture in electrolytes. From well-balanced ionic and electronic transport properties,5 wt% LLZT blended NMC cathodes delivered enhanced electrochemical performances in fullcells. Unlike other complicated coating processes, our proposed blending approach can beimplemented in commercial Li-ion battery manufacturing due to its advantages in terms ofmanufacturing friendliness, energy saving, and cost effectiveness.