%0 Journal Article
%A Saravanan Kuppan
%A Angelique Jarry
%A Robert Kostecki
%A Guoying Chen
%B Scientific Reports
%D 2015
%G eng
%N 1
%R 10.1038/srep08027
%T A study of room-temperature Li<sub>x</sub>Mn<sub>1.5</sub>Ni<sub>0.5</sub>O<sub>4</sub> solid solutions
%U http://www.nature.com/articles/srep08027http://www.nature.com/articles/srep08027.pdfhttp://www.nature.com/articles/srep08027http://www.nature.com/articles/srep08027.pdf
%V 5
%8 01/2015
%! Sci Rep
%X <p><span>Understanding the kinetic implication of solid-solution&nbsp;</span><em>vs</em><span>. biphasic reaction pathways is critical for the development of advanced intercalation electrode materials. Yet this has been a long-standing challenge in materials science due to the elusive metastable nature of solid solution phases. The present study reports the synthesis, isolation and characterization of room-temperature Li</span><sub><span><em>x</em></span></sub><span>Mn</span><sub><span>1.5</span></sub><span>Ni</span><sub><span>0.5</span></sub><span>O</span><sub><span>4</span></sub><span>&nbsp;solid solutions.&nbsp;</span><em>In situ</em><span>&nbsp;XRD studies performed on pristine and chemically-delithiated, micron-sized single crystals reveal the thermal behavior of <span>Li</span><sub><em>x</em></sub><span>Mn</span><sub>1.5</sub><span>Ni</span><sub>0.5</sub><span>O</span><sub>4</sub></span><span>&nbsp;(0 ≤&nbsp;</span><em>x</em><span>&nbsp;≤ 1) cathode material consisting of three cubic phases: LiMn</span><sub><span>1.5</span></sub><span>Ni</span><sub><span>0.5</span></sub><span>O</span><sub><span>4</span></sub><span>&nbsp;(Phase I), Li</span><sub><span>0.5</span></sub><span>Mn</span><sub><span>1.5</span></sub><span>Ni</span><sub><span>0.5</span></sub><span>O</span><sub><span>4</span></sub><span>&nbsp;(Phase II) and Mn</span><sub><span>1.5</span></sub><span>Ni</span><sub><span>0.5</span></sub><span>O</span><sub><span>4</span></sub><span>&nbsp;(Phase III). A phase diagram capturing the structural changes as functions of both temperature and Li content was established. The work not only demonstrates the possibility of synthesizing alternative electrode materials that are metastable in nature, but also enables in-depth evaluation on the physical, electrochemical and kinetic properties of transient intermediate phases and their role in battery electrode performance.</span></p>