Cathode active material, cathode including the cathode active material, and sodium secondary battery including the cathode
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United States of America Patent
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Oct 25, 2016
Grant Date -
Apr 23, 2015
app pub date -
Oct 21, 2014
filing date -
Oct 21, 2013
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Abstract
A cathode active material including a composite transition metal oxide including: sodium; a first transition metal; and a second transition metal, wherein the composite transition metal oxide has a first diffraction peak corresponding to a Miller index of (003) and derived from a layered rock salt structure, and a second diffraction peak corresponding to a Miller index of (104) and derived from a cubic rock salt structure in an X-ray powder diffraction (XRD) pattern, wherein an intensity ratio (I1/I2) of the first diffraction peak to the second diffraction peak is about 7 or greater.
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