公开(公告)号：US20200212442A1

公开(公告)日：2020-07-02

申请号：US16805990

申请日：2020-03-02

Applicant: TODA KOGYO CORP.

Inventor： Hiroyasu WATANABE ,  Xiang SUN

IPC: H01M4/525 ,  C23C16/455 ,  C23C16/40 ,  C23C16/56 ,  H01M4/36 ,  H01M4/48 ,  H01M10/0525

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.

公开(公告)号：US20200185708A1

公开(公告)日：2020-06-11

申请号：US16617161

申请日：2018-07-13

Applicant: TODA KOGYO CORP.

Inventor： Hiroyasu WATANABE ,  Xiang SUN

IPC: H01M4/36 ,  C01G53/00 ,  H01M4/525 ,  H01M10/0525

Abstract: The present invention provides positive electrode active substance particles comprising a lithium nickelate composite oxide which have a high energy density and which are excellent in repeated charge/discharge cycle characteristics upon charging at a high voltage when used in a secondary battery, 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 of 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); and a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si, in which the coating compound Y has an average film thickness of 0.2 to 5 nm, a degree of crystallinity of 50 to 95%, a degree of epitaxy of 50 to 95% and a coating ratio (coverage) of 50 to 95%.