US 12,347,856 B2
Positive electrode active substance for all solid-state lithium secondary battery
Tetsuya Mitsumoto, Takehara (JP); and Daisuke Washida, Ageo (JP)
Assigned to Mitsui Mining & Smelting Co., Ltd., Tokyo (JP)
Appl. No. 16/642,614
Filed by Mitsui Mining & Smelting Co., Ltd., Tokyo (JP)
PCT Filed Aug. 27, 2018, PCT No. PCT/JP2018/031484
§ 371(c)(1), (2) Date Feb. 27, 2020,
PCT Pub. No. WO2019/044733, PCT Pub. Date Mar. 7, 2019.
Claims priority of application No. 2017-163710 (JP), filed on Aug. 28, 2017.
Prior Publication US 2020/0194788 A1, Jun. 18, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/505 (2010.01); H01M 4/02 (2006.01); H01M 4/131 (2010.01); H01M 4/1391 (2010.01); H01M 4/36 (2006.01); H01M 4/485 (2010.01); H01M 4/525 (2010.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 10/0562 (2010.01)
CPC H01M 4/505 (2013.01) [H01M 4/131 (2013.01); H01M 4/36 (2013.01); H01M 4/366 (2013.01); H01M 4/485 (2013.01); H01M 4/525 (2013.01); H01M 4/628 (2013.01); H01M 10/0525 (2013.01); H01M 10/0562 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01); H01M 4/1391 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A positive electrode active substance for an all solid-state lithium secondary battery, having an operating potential of 4.5 V or more at a metal Li reference potential, wherein a surface of present core particles composed of a spinel-type lithium manganese-containing composite oxide containing at least Li, Mn, O, and two or more elements other than Li, Mn, and O is coated with an amorphous compound containing Li, A, and O, where A represents one element or a combination of two or more elements selected from the group consisting of Ti, Zr, Ta, Nb, Zn, W, and Al; and primary particles of the present core particles are composed of a polycrystal;
wherein, with regard to a D50, a mode diameter, and a D10 of the positive electrode active substance according to a measurement of a volume-based particle size distribution obtained via measurements by a laser diffraction scattering-type particle size distribution measurement method, the D50 is 0.5 to 9 μm, a percentage of a ratio of the absolute value of the difference between the mode diameter and the D50 relative to the mode diameter, (|mode diameter−D50|/mode diameter)×100, is 0 to 25%, a percentage of a ratio of the absolute value of the difference between the mode diameter and the D10 relative to the mode diameter, (|mode diameter−D10|/mode diameter)×100, is 20 to 58%;
wherein a ratio, average primary particle, diameter/D50 of an average primary particle diameter of the positive electrode active substance, which is calculated from a scanning-type electron microscope (SEM) image obtained by a scanning-type electron microscope (SEM), relative to the D50 is 0.20 to 0.99;
wherein said amorphous compound contains Li in excess of 1 mol relative to 1 mol of the A element; and
wherein an amount of carbonate ions present on the surface of the positive electrode active substance is less than 2.5 wt % relative to the positive electrode active substance.