US 12,176,520 B2
Positive electrode active material, method for producing positive electrode active material, positive electrode, and secondary battery
Yoshiyuki Arai, Ibaraki (JP); Kazuyuki Sugita, Ibaraki (JP); Atsushi Honda, Ibaraki (JP); Yuichiro Takimoto, Ibaraki (JP); Hideki Kurihara, Saitama (JP); Masashi Inamoto, Saitama (JP); and Kyousuke Doumae, Fukui (JP)
Assigned to Sanoh Industrial Co., Ltd., Tokyo (JP)
Appl. No. 16/646,654
Filed by SANOH INDUSTRIAL CO., LTD., Tokyo (JP)
PCT Filed Sep. 12, 2018, PCT No. PCT/JP2018/033741
§ 371(c)(1), (2) Date Mar. 12, 2020,
PCT Pub. No. WO2019/054395, PCT Pub. Date Mar. 21, 2019.
Claims priority of application No. 2017-177820 (JP), filed on Sep. 15, 2017.
Prior Publication US 2020/0403226 A1, Dec. 24, 2020
Int. Cl. C01G 31/02 (2006.01); H01M 4/04 (2006.01); H01M 4/131 (2010.01); H01M 4/133 (2010.01); H01M 4/1391 (2010.01); H01M 4/1393 (2010.01); H01M 4/36 (2006.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 10/054 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/364 (2013.01) [H01M 4/0471 (2013.01); H01M 4/131 (2013.01); H01M 4/133 (2013.01); H01M 4/1391 (2013.01); H01M 4/1393 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 10/054 (2013.01); H01M 2004/028 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A positive electrode active material for a magnesium secondary battery or lithium ion secondary battery, comprising:
a particle comprising
a nucleus and
a crystal of ammonium vanadate grown from the nucleus as a starting point and having a maximum length of 5 μm or less in a major axis direction,
wherein the nucleus is formed of titanium sulfate or iron sulfate.
 
9. A positive electrode active material for a magnesium secondary battery or lithium ion secondary battery, comprising:
a particle comprising
a nucleus and
a crystal of ammonium vanadate grown from the nucleus as a starting point and having a maximum length of 5 μm or less in a major axis direction,
wherein the nucleus is formed of a titanium compound.