Lithium transition metal-based compound powder, method for manufacturing the same, spray-dried substance serving as firing precursor thereof, and lithium secondary battery positive electrode and lithium secondary battery using the same
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United States of America Patent
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Feb 24, 2015
Grant Date -
Aug 19, 2010
app pub date -
Sep 4, 2008
filing date -
Sep 4, 2007
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Abstract
A lithium transition metal-based compound powder for a lithium secondary battery positive electrode material that can achieve both improvements of load characteristics such as rate and output characteristics and a higher density is a lithium transition metal-based compound powder containing, as a main component, a lithium transition metal-based compound that has a function of allowing elimination and insertion of lithium ions, and including a crystal structure belonging to a layer structure, wherein primary particles are aggregated to form secondary particles, the ratio A/B of a median diameter A of the secondary particles to an average diameter (average primary particle diameter B) is in the range of 8 to 100, and 0.01≦FWHM(110)≦0.5 where FWHM(110) is the half width of a (110) diffraction peak present near a diffraction angle 2θ of 64.5° in a powder X-ray diffraction analysis using a CuKα line.
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