US 11,901,558 B2
Lithium niobate and method for producing the same
Koichi Sugiura, Toyota (JP); Nariaki Miki, Okazaki (JP); Kazuki Muraishi, Toyota (JP); and Kengo Matsuo, Sunto-gun (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Dec. 30, 2021, as Appl. No. 17/566,054.
Application 17/566,054 is a division of application No. 16/551,877, filed on Aug. 27, 2019, abandoned.
Claims priority of application No. 2018-160424 (JP), filed on Aug. 29, 2018.
Prior Publication US 2022/0123315 A1, Apr. 21, 2022
Int. Cl. H01M 4/62 (2006.01); H01M 4/36 (2006.01); C01G 33/00 (2006.01); H01M 10/0525 (2010.01); H01M 4/525 (2010.01); H01M 4/02 (2006.01); H01M 4/505 (2010.01)
CPC H01M 4/62 (2013.01) [C01G 33/00 (2013.01); H01M 4/366 (2013.01); H01M 10/0525 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 2004/028 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A method for producing an all-solid-state battery,
the method comprising:
preparing a solution containing niobium ions and lithium ions,
drying the solution to obtain a lithium niobate precursor, and
obtaining a lithium niobate by heating the lithium niobate precursor at a temperature of from 250° C. to 300° C. for a heating time of more than 0 minute and 10 minutes or less, and
wherein an A/B ratio value of the lithium niobate between a first peak intensity value A at a diffraction angle (2θ) of 23.7°±0.5° and a second peak intensity value B at a diffraction angle (2θ) of 53.2°±0.5°, is 1.96 or more and 2.54 or less, and the peak intensities are observed by X-ray diffraction (XRD) measurement using CuKα radiation;
wherein the all-solid-state battery comprises a cathode comprising a cathode layer, an anode comprising an anode layer, and a solid electrolyte layer disposed between the cathode layer and the anode layer;
wherein the cathode layer contains composite active material particles;
wherein the composite active material particles are composed of cathode active material particles and a covering layer;
wherein the covering layer contains the lithium niobate and covering at least part of the surface of the cathode active material particles;
wherein the solid electrolyte layer contains a sulfide-based solid electrolyte; and
wherein the sulfide-based solid electrolyte contains 10LiI-15LiBr-37.5Li3PS4 as a raw material composition.