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Structural Degradation of High Voltage Lithium Nickel Manganese Cobalt Oxide (NMC) Cathodes in Solid-State Batteries and Implications for Next Generation Energy Storage
journal contribution
posted on 2020-02-03, 16:24 authored by Nathan D. Phillip, Andrew S. Westover, Claus Daniel, Gabriel M. VeithIn
this study, we report the stability of the layered high voltage cathode
NMC622 with respect to a standard liquid electrolyte and in an all
solid-state configuration. NMC622 cathodes with a (104) orientation
were found to suffer from degradation at high voltage (4.5 V vs Li/Li+) due to electrolyte-promoted degradation of the layered structure
in a carbonate electrolyte. The lithium phosphorus oxynitride (LiPON)
electrolyte was able to suppress the extent of this decomposition
in solid-state cells but not totally prevent it from occurring. In
the solid-state cells the capacity decreased from 203 to 93 mAh/g
in the first cycle and from 93 to 79 mAh/g over the subsequent 99
cycles, whereas, after 20 cycles, the liquid cell charge capacity
was dominated by the irreversible electrolyte degradation. The interfacial
resistances of the solid-state cells were stable with cycling, suggesting
minimal degradation of the NMC622/LiPON interface and incumbent losses
due to structural evolution associated with cathode orientation. This
data indicates that accessing stable high voltage capacity in NMCs
will not be enabled by simply stabilizing the cathode–electrolyte
interface. Optimizing cathode crystallographic orientation may be
the key to accessing this high voltage regime.
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voltage cathode NMC 622electrolyte degradationvoltage capacityaccessinglithium phosphorus oxynitrideinterfaceelectrolyte-promoted degradationcarbonate electrolytemAhNext Generation Energy StorageHigh Voltage Lithium Nickel Manganese Cobalt OxideStructural Degradation99 cyclescathode orientationOptimizing cathodevoltage regimeNMC 622 cathodescell charge capacitySolid-State Batteries20 cycles
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