%0 Journal Article
%A Jing Xu
%A Sara E Renfrew
%A Matthew A Marcus
%A Meiling Sun
%A Bryan D McCloskey
%A Wei Tong
%B The Journal of Physical Chemistry C
%D 2017
%G eng
%N 21
%P 11100 - 11107
%R 10.1021/acs.jpcc.7b0179910.1021/acs.jpcc.7b01799.s001
%T Investigating Li <sub>2</sub>NiO <sub>2</sub> –Li<sub>2</sub>CuO <sub>2</sub>Solid Solutions as High-Capacity Cathode Materials for Li-Ion Batteries
%V 121
%8 05/2017
%! J. Phys. Chem. C
%X <p><span>Li</span><span>2</span><span>Ni</span><span>1–<em>x</em></span><span>Cu</span><span><em>x</em></span><span>O</span><span>2</span><span>&nbsp;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 Li</span><span>2</span><span>Ni</span><span>1–<em>x</em></span><span>Cu</span><span><em>x</em></span><span>O</span><span>2</span><span>&nbsp;with orthorhombic&nbsp;</span><em>Immm</em><span>&nbsp;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.</span></p>