High-pressure synthesis and electrochemical behavior of layered image oxides

Layered image oxides, image, have been prepared by solid state reaction between NiO, image and image under high pressure. The structural characterization of the layered oxides was performed using powder XRD, IR spectroscopy and EPR spectroscopy at 9.23 and 115 GHz. It has been found that the high-pressure favors Al substitution for Ni in the image-layers of layered image. A random Al/Ni distribution in the layer was found. The incorporation of extra Li in the image-layer starts at a precursor composition image. While pure image-layers are able to incorporate under high-pressure up to 1/3Li, the appearance of Al in the image-layers hinders image dissolution image. In addition, with increasing Al content there is a strong cationic mixing between the layers. High-frequency EPR of image indicates that the structural interaction of image with image proceeds via the formation of domains comprising different amount of image ions. The use of image as a cathode material in a lithium ion cells displays a first irreversible Li extraction at 4.8 V, after which a reversible lithium insertion/extraction between 3.0 and 4.5 V is observed on further cycling.