公开(公告)号：US20230163293A1

公开(公告)日：2023-05-25

申请号：US17917177

申请日：2021-03-23

Applicant: GS Yuasa International Ltd.

Inventor： Takenori TOYAMA ,  Shinya OTANI ,  Daisuke ENDO

IPC: H01M4/525 ,  H01M10/052 ,  H01M4/505

CPC classification number: H01M4/525 ,  H01M10/052 ,  H01M4/505 ,  H01M2004/028

Abstract: A positive active material for a nonaqueous electrolyte energy storage device according to one aspect of the present invention is a positive active material for a nonaqueous electrolyte energy storage device containing a lithium transition metal composite oxide having an α-NaFeO2 structure, the positive active material further containing aluminum, in which the lithium transition metal composite oxide contains at least one of nickel and cobalt, and manganese, a content of manganese in a transition metal. in the lithium transition metal composite oxide is 0.6 or less in terms of molar ratio, and in a charged state at a potential of 4.35 V vs. Li/Li+ in a state where there is no charge history in which the potential reaches 4.5 V vs. Li/Li+ or more, an oxygen positional parameter of the positive active material determined from crystal structure analysis by a Rietveld method when a space group R3-m is used. for a crystal structure model based on an X-ray diffraction pattern is 0.265 or more and 0.269 or less.

公开(公告)号：US20230036223A1

公开(公告)日：2023-02-02

申请号：US17788864

申请日：2020-12-16

Applicant: GS YUASA INTERNATIONAL LTD.

Inventor： Shinya OTANI ,  Takenori TOYAMA ,  Daisuke ENDO

IPC: H01M4/525 ,  H01M4/505 ,  C01G53/00

Abstract: A nonaqueous electrolyte energy storage device according to one aspect of the present invention is a nonaqueous electrolyte energy storage device including a positive electrode having positive active material particles, in which the positive active material particles contain a lithium transition metal composite oxide having an α-NaFeO2 structure, the lithium transition metal composite oxide contains at least one of nickel and cobalt, and manganese, a content of lithium with respect to a transition metal in the lithium transition metal composite oxide exceeds 1.0 in terms of a molar ratio, a diffraction peak is present in a range of 20° or more and 22° or less in an X-ray diffraction diagram of the lithium transition metal composite oxide using a CuKα ray, and the positive active material particles contain aluminum.