Department of Energy (“Grid Energy Storage”, U.S. The USABC (“USABC Goals for Advanced Batteries for EVs - CY 2020 Commercialization”, USCAR, 2015) and U.S. The ability to mitigate degradation mechanisms for Ni-rich NMC and NCA illustrated in this report provides insight into a method to enable the performance of high-voltage LIBs. EIS confirmed that Al 2O 3-coated materials had significantly lower increase in the charge transfer component of impedance during cycling. High resolution TEM/SAED structural characterization revealed that Al 2O 3 coatings prevented surface-initiated layered-to-spinel phase transitions in coated materials which were prevalent in uncoated materials. Our results show that Al 2O 3 coating improved the NMC cycling performance by 40% and the NCA cycling performance by 34% at 1 C/−1 C with respectively 4.35 V and 4.4 V UCV in 2 Ah pouch cells. In this report, we show that atomic layer deposition (ALD) of titania (TiO 2) and alumina (Al 2O 3) on Ni-rich FCG NMC and NCA active material particles could substantially improve LIB performance and allow for increased upper cutoff voltage (UCV) during charging, which delivers significantly increased specific energy utilization. The energy density of current lithium-ion batteries (LIBs) based on layered LiMO 2 cathodes (M = Ni, Mn, Co: NMC M = Ni, Co, Al: NCA) needs to be improved significantly in order to compete with internal combustion engines and allow for widespread implementation of electric vehicles (EVs).
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