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公开(公告)号：US20210143397A1
公开(公告)日：2021-05-13
申请号：US17152801
申请日：2021-01-20
Inventor： SHUHEI UCHIDA , RYUICHI NATSUI , KENSUKE NAKURA
Abstract: A positive electrode active material includes a lithium composite oxide having a crystal structure belonging to the space group Fd-3m and has an integrated intensity ratio I(18°-20°)/I(43°-46°) of greater than or equal to 0.05 and less than or equal to 0.90 and an integrated intensity ratio I(63°-65°)/I(17°-19°) of greater than or equal to 0.8 and less than or equal to 2.0. The integrated intensity ratio I(18°-20°)/I(43°-46°) is a ratio of an integrated intensity I(18°-20°) to an integrated intensity I(43°-46°). The integrated intensity ratio I(63°-65°)/I(17°-19°) is a ratio of an integrated intensity I(63°-65°) to an integrated intensity I(17°-19°). The integrated intensity I(A°-B°) is an integrated intensity of a maximum peak present in a range of angle of diffraction 2θ greater than or equal to A° and less than or equal to B° in the X-ray diffraction pattern of the positive electrode active material.
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公开(公告)号：US20210151740A1
公开(公告)日：2021-05-20
申请号：US17159245
申请日：2021-01-27
Inventor： SHUHEI UCHIDA , RYUICHI NATSUI , KENSUKE NAKURA
Abstract: A positive electrode active material according to the present disclosure includes a lithium composite oxide that contains at least one element selected from the group consisting of F, Cl, N, and S, and at least one element selected from the group consisting of Bi, La, Ce, Ga, Sr, Y, and Sn. Mathematical formula 0.05≤integrated intensity ratio I(18°-20°)/I(43°-46°)≤0.90 is satisfied. The integrated intensity ratio I(18°-20°)/I(43°-46°) is a ratio of an integrated intensity I(18°-20°) to an integrated intensity I(43°-46°). The integrated intensity I(A°-B°)is an integrated intensity of a maximum peak present in a range of angle of diffraction 2θ greater than or equal to A° and less than or equal to B° in the X-ray diffraction pattern of the lithium composite oxide.
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公开(公告)号：US20210143424A1
公开(公告)日：2021-05-13
申请号：US17152799
申请日：2021-01-20
Inventor： SHUHEI UCHIDA , RYUICHI NATSUI , KENSUKE NAKURA
IPC: H01M4/525 , H01M4/36 , H01M4/505 , H01M10/0525
Abstract: A positive electrode active material includes a first lithium composite oxide and a second lithium composite oxide that covers at least a part of the surface of the first lithium composite oxide. The first lithium composite oxide includes at least one selected from the group consisting of F, Cl, N, and S. The first lithium composite oxide has a crystal structure belonging to a layered structure. The second lithium composite oxide has a crystal structure belonging to space group Fd-3m. The positive electrode active material has an integrated intensity ratio I(18°-20°)/I(43°-46°) of greater than or equal to 0.05 and less than or equal to 0.90.
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公开(公告)号：US20200075946A1
公开(公告)日：2020-03-05
申请号：US16503442
申请日：2019-07-03
Inventor： KENSUKE NAKURA , RYUICHI NATSUI , SHUHEI UCHIDA , TAKUJI TSUJITA
Abstract: Provided is a cathode active material comprising a lithium composite oxide and a covering material which covers a surface of the lithium composite oxide. The lithium composite oxide is a multi-phase mixture including a first phase having a crystal structure which belongs to a monoclinic crystal; a second phase having a crystal structure which belongs to a hexagonal crystal; and a third phase having a crystal structure which belongs to a cubical crystal. The lithium composite oxide has an integral intensity ratio I(18°-20°)/I(43°-46°) of not less than 0.05 and not more than 0.99, where the integral intensity I(α°-β°) is an integral intensity of a peak which is a maximum peak present within a range of a diffraction angle 2θ of not less than α° and not more than β° in an X-ray diffraction pattern of the lithium composite oxide. The covering material has an electronic conductivity of not more than 106 S/m.
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