POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY

WIPO Patent Application WO/2017/150522

A1

Provided is a positive electrode active material for a lithium secondary battery, said material including active particles that are represented by the general formula Li1±xCoyM1-x-yO2 (In the formula, 0.95 ≤ 1±x ≤ 1.05, y ≥ 0.8, 1-x-y > 0, and M is any one or a combination of two or more elements from the group consisting of Mn, Ni, Na, Mg, Al, Si, P, K, Ca, Ti, V, Cr, Fe, Cu, Zn, Ga, Y, Zr, Nb, Mo, In, Ta, W, Re, and Ce), have a layered crystal structure, and are provided, on the surface thereof, with a surface part in which any one or a combination of two or more elements (referred to as "surface element A") from the group consisting of Al, Ti, and Zr is present, and being characterized in that the ratio (A/(Co+M)) of the atomic ratio of surface element A to the total of the atomic ratios of Co and M as measured by XPS is 0.07-0.8, the amount of surface lithium impurities is less than 0.15 wt%, and the peak integrated intensity ratio (003)/(104) as measured by XRD is 1.15-3.00.

MITSUMOTO TETSUYA (JP)
WASHIDA DAISUKE (JP)
MATSUSHIMA HIDEAKI (JP)

PCT/JP2017/007756

September 08, 2017

February 28, 2017

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MITSUI MINING & SMELTING CO (JP)

H01M4/525; C01G51/00; H01M4/36; H01M4/505

WO2002054511A1	2002-07-11
WO2014136760A1	2014-09-12

JP2001319652A	2001-11-16
JP2003217659A	2003-07-31
JP2003203634A	2003-07-18
JP2005149957A	2005-06-09
JP2004207034A	2004-07-22
JP2015536558A	2015-12-21
JP2015076397A	2015-04-20
JP2014049309A	2014-03-17

TAKEUCHI, ICHIZAWA & ASSOCIATES (JP)

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