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- W2763630186 abstract "Ni-rich LiNixCoyMnzO2 (NCM) cathode materials have great potential for application in next-generation lithium-ion batteries owing to their high specific capacity. However, they are subjected to severe structural changes upon (de)lithiation, which adversely affects the cycling stability. Herein, we investigate changes in crystal and electronic structure of NCM811 (80% Ni) at high states of charge by a combination of operando X-ray diffraction (XRD), operando hard X-ray absorption spectroscopy (hXAS), ex situ soft X-ray absorption spectroscopy (sXAS), and density functional theory (DFT) calculations and correlate the results with data from galvanostatic cycling in coin cells. XRD reveals a large decrease in unit cell volume from 101.38(1) to 94.26(2) A3 due to collapse of the interlayer spacing when x(Li) < 0.5 (decrease in c-axis from 14.469(1) A at x(Li) = 0.6 to 13.732(2) A at x(Li) = 0.25). hXAS shows that the shrinkage of the transition metal–oxygen layer mainly originates from nickel oxidation. sXAS, ..." @default.
- W2763630186 created "2017-10-20" @default.
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- W2763630186 date "2017-10-27" @default.
- W2763630186 modified "2023-10-10" @default.
- W2763630186 title "Charge-Transfer-Induced Lattice Collapse in Ni-Rich NCM Cathode Materials during Delithiation" @default.
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- W2763630186 doi "https://doi.org/10.1021/acs.jpcc.7b06598" @default.
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