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Nayak, Prasant Kumar,Grinblat, Judith,Levi, Mikhael D.,Haik, Ortal,Levi, Elena,Talianker, Michael,Markovsky, Boris,Sun, Yang-Kook,Aurbach, Doron American Chemical Society 2015 Chemistry of materials Vol.27 No.7
<P>Li[Ni<SUB>1/3</SUB>Mn<SUB>2/3</SUB>]O<SUB>2</SUB> was synthesized by a self-combustion reaction (SCR), characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy, and studied as a cathode material for Li-ion batteries at 30 °C and 45 °C. The structural studies by XRD and TEM confirmed monoclinic Li[Li<SUB>1/3</SUB>Mn<SUB>2/3</SUB>]O<SUB>2</SUB> phase as the major component, and rhombohedral (LiNiO<SUB>2</SUB>), spinel (LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB>), and rock salt Li<SUB>0.2</SUB>Mn<SUB>0.2</SUB>Ni<SUB>0.5</SUB>O as minor components. The content of the spinel phase increases upon cycling due to the layered-to-spinel phase transition occurring at high potentials. A high discharge capacity of about 220 mAh g<SUP>–1</SUP> is obtained at low rate (C/10) with good capacity retention upon cycling. However, LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> synthesized by SCR exhibits a discharge capacity of about 190 mAh g<SUP>–1</SUP> in the potential range of 2.4–4.9 V, which decreases to a value of 150 mAh g<SUP>–1</SUP> after 100 cycles. Because of the presence of the spinel component, Li[Ni<SUB>1/3</SUB>Mn<SUB>2/3</SUB>]O<SUB>2</SUB> cathode material exhibits part of its capacity at potentials around 4.7 V. Thus, it can be considered as an interesting high-capacity and high-voltage cathode material for high-energy-density Li-ion batteries. Also, the Li[Ni<SUB>1/3</SUB>Mn<SUB>2/3</SUB>]O<SUB>2</SUB> electrodes exhibit better electrochemical stability than spinel LiNi<SUB>0.5</SUB>Mn<SUB>1.5</SUB>O<SUB>4</SUB> electrodes when cycled at 45 °C.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2015/cmatex.2015.27.issue-7/acs.chemmater.5b00405/production/images/medium/cm-2015-00405w_0020.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm5b00405'>ACS Electronic Supporting Info</A></P>
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