US 12,224,423 B2
Lithium composite oxide sintered body plate
Yukinobu Yura, Nagoya (JP); and Shigeki Okada, Nagoya (JP)
Assigned to NGK INSULATORS, LTD., Nagoya (JP)
Filed by NGK INSULATORS, LTD., Nagoya (JP)
Filed on Oct. 6, 2021, as Appl. No. 17/495,004.
Application 17/495,004 is a continuation of application No. 16/531,420, filed on Aug. 5, 2019, granted, now 11,211,599.
Application 16/531,420 is a continuation of application No. PCT/JP2018/004465, filed on Feb. 8, 2018.
Claims priority of application No. 2017-024345 (JP), filed on Feb. 13, 2017; application No. 2017-101079 (JP), filed on May 22, 2017; application No. 2017-244183 (JP), filed on Dec. 20, 2017; and application No. PCT/JP2018/001619 (WO), filed on Jan. 19, 2018.
Prior Publication US 2022/0029148 A1, Jan. 27, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/00 (2006.01); C04B 35/01 (2006.01); H01M 4/04 (2006.01); H01M 4/131 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 10/04 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/131 (2013.01) [C04B 35/01 (2013.01); H01M 4/0404 (2013.01); H01M 4/0471 (2013.01); H01M 4/364 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0436 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A lithium secondary battery comprising:
a positive electrode that is a lithium complex oxide sintered plate including a first major plate face and a second major plate face that is opposite from and parallel to the first major plate face;
a negative electrode; and
a separator between the positive electrode and the negative electrode, the separator being disposed on one of the first or second major plate faces of the lithium complex oxide sintered plate,
wherein the lithium complex oxide sintered plate has a structure in which a plurality of primary grains having a layered rock-salt structure are bonded, and has:
a porosity of 3 to 40%,
a mean pore diameter of 0.1 μm or more and 15 μm or less,
an open pore rate of 70% or more and 95% or less, and
a thickness of 15 to 200 μm,
wherein the primary grains have a primary grain diameter of 0.5 μm or more and 20 μm or less and a mean tilt angle of more than 0° to 30° or less, the mean tilt angle being a mean value of the angles defined by the (003) planes of the primary grains and one of the first or second major plate faces of the lithium complex oxide sintered plate,
wherein a ratio of individual primary grains having a tilt angle of more than 0° to 30° or less among all primary grains is 60% or more, and the tilt angle being defined by the (003) plane of the primary grain and one of the first or second major plate faces of the lithium complex oxide sintered plate, and
wherein the sintered plate does not include a binder.