公开(公告)号：US20220085362A1

公开(公告)日：2022-03-17

申请号：US17422830

申请日：2020-01-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Sukeyoshi YAMAMOTO ,  Tatsuo NAGATA ,  Shunsuke TANIGUCHI ,  Takafumi AMINO ,  Akira TANIYAMA

IPC: H01M4/38 ,  C22C9/00 ,  H01M10/0525

Abstract: Provided is a negative electrode active material which is excellent in capacity, capacity retention ratio, and a coulombic efficiency when charging/discharging is repeated. The chemical composition of the alloy particles of the negative electrode active material of the present disclosure includes 0.50 to 3.00 mass % of oxygen, and alloy elements containing Sn: 13.0 to 40.0 at % and Si: 6.0 to 40.0 at %, with the balance being Cu and impurities. The structure of the alloy particles includes: one or more types selected from the group consisting of a phase having a D03 structure, and a δ phase; one or more types selected from the group consisting of an ε phase and an η′ phase; and a SiOx phase (x=0.50 to 1.70). The SiOx phase (x=0.50 to 1.70) has a volume fraction of 5.0 to 60.0% and the η′ phase has a volume fraction of 0 to 60.0%.

公开(公告)号：US20200152980A1

公开(公告)日：2020-05-14

申请号：US16631077

申请日：2018-07-17

Applicant: NIPPON STEEL CORPORATION

Inventor： Sukeyoshi YAMAMOTO ,  Tatsuo NAGATA ,  Koji MORIGUCHI

IPC: H01M4/38 ,  H01M4/505 ,  H01M4/525 ,  H01M4/485

Abstract: The negative electrode active material according to the present embodiment includes alloy particle containing an alloy component and oxygen of 0.50 to 3.00 mass %. The alloy component contains Sn: 13.0 to 40.0 at % and Si: 6.0 to 40.0 at %. The alloy particle contains: one or two phases selected from a D03 phase in which the Si content is from 0 to 5.0 at % and a δ phase in which the Si content is from 0 to 5.0 at %; one or two phases selected from an ε phase in which the Si content is from 0 to 5.0 at % and an η′ phase in which the Si content is from 0 to 5.0 at %; and an SiOx phase. The alloy particle has, in an X-ray diffraction profile, a peak having a largest integrated diffraction intensity in a range of 42.0 to 44.0 degrees of a diffraction angle 2θ.