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公开(公告)号：US12183921B2
公开(公告)日：2024-12-31
申请号：US16975280
申请日：2019-03-01
Applicant: TODA KOGYO CORP.
Inventor： Hiroyasu Watanabe , Xiang Sun , Mitchell Fetterer
Abstract: Provided herein are positive electrode active substance particles comprising a lithium nickelate composite oxide which have a high energy density and are excellent in repeated charge/discharge cycle characteristics when charging at a high voltage, as well as a non-aqueous electrolyte secondary battery. The positive electrode active substance particles herein can each comprise a core particle X comprising a lithium nickelate composite oxide having a layer structure which is represented by the formula: Li1+aNi1-b-cCObMcO2, as defined herein; and a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si and having an average film thickness of 0.2 to 5 nm, in which a crystal phase having a layered rock salt structure and comprising Ni2+ ions is present in the form of a layer between the core particle X and the coating compound Y.
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公开(公告)号：US11552292B2
公开(公告)日：2023-01-10
申请号：US16805990
申请日：2020-03-02
Applicant: TODA KOGYO CORP.
Inventor： Hiroyasu Watanabe , Xiang Sun
IPC: H01M4/04 , H01M4/525 , C23C16/455 , H01M4/62 , H01M4/1391 , C23C16/40 , C23C16/56 , H01M4/36 , H01M4/48 , H01M10/0525 , H01M10/052 , H01M4/02
Abstract: The present invention provides lithium nickelate-based positive electrode active substance particles having a high energy density which are excellent in charge/discharge cycle characteristics when highly charged, and hardly suffer from generation of gases upon storage under high-temperature conditions, and a process for producing the positive electrode active substance particles, as well as a non-aqueous electrolyte secondary battery. The present invention relates to positive electrode active substance particles each comprising a core particle X comprising a lithium nickelate composite oxide having a layer structure which is represented by the formula: Li1+aNi1−b−cCobMcO2 wherein M is at least one element selected from the group consisting of Mn, Al, B, Mg, Ti, Sn, Zn and Zr; a is a number of −0.1 to 0.2 (−0.1•a•0.2); b is a number of 0.05 to 0.5 (0.05•b•0.5); and c is a number of 0.01 to 0.4 (0.01•c•0.4); a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si; and a coating compound Z comprising an Li element, in which a content of lithium hydroxide LiOH in the positive electrode active substance particles is not more than 0.40% by weight, a content of lithium carbonate Li2CO3 in the positive electrode active substance particles is not more than 0.65% by weight, and a weight ratio of the content of lithium carbonate to the content of lithium hydroxide is not less than 1.
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