Li2Ni1–xCuxO2 solid solutions were prepared by a solid-state method to study the correlation between composition and electrochemical performance. Cu incorporation improved the phase purity of Li2Ni1–xCuxO2 with orthorhombic Immm structure, resulting in enhanced capacity. However, the electrochemical profiles suggested Cu incorporation did not prevent irreversible phase transformation during the electrochemical process, instead, it likely influenced the phase transformation upon lithium removal. By combining ex situ X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and differential electrochemical mass spectrometry (DEMS) measurements, this study elucidates the relevant phase transformation (e.g., crystal structure, local environment, and charge compensation) and participation of electrons from lattice oxygen during the first cycle in these complex oxides.
BT - The Journal of Physical Chemistry C DA - 05/2017 DO - 10.1021/acs.jpcc.7b0179910.1021/acs.jpcc.7b01799.s001 IS - 21 LA - eng N2 -Li2Ni1–xCuxO2 solid solutions were prepared by a solid-state method to study the correlation between composition and electrochemical performance. Cu incorporation improved the phase purity of Li2Ni1–xCuxO2 with orthorhombic Immm structure, resulting in enhanced capacity. However, the electrochemical profiles suggested Cu incorporation did not prevent irreversible phase transformation during the electrochemical process, instead, it likely influenced the phase transformation upon lithium removal. By combining ex situ X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and differential electrochemical mass spectrometry (DEMS) measurements, this study elucidates the relevant phase transformation (e.g., crystal structure, local environment, and charge compensation) and participation of electrons from lattice oxygen during the first cycle in these complex oxides.
PY - 2017 SP - 11100 EP - 11107 ST - J. Phys. Chem. C T2 - The Journal of Physical Chemistry C TI - Investigating Li 2NiO 2 –Li2CuO 2Solid Solutions as High-Capacity Cathode Materials for Li-Ion Batteries VL - 121 SN - 1932-7447 ER -