公开(公告)号：US12272822B2

公开(公告)日：2025-04-08

申请号：US16624319

申请日：2018-06-14

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masahiro Takahashi ,  Mayumi Mikami ,  Yohei Momma ,  Teruaki Ochiai ,  Jyo Saitou

IPC: H01M4/525 ,  C01G51/66 ,  C01G53/66 ,  H01M4/13915 ,  H01M10/0525 ,  C01G45/1214 ,  C01G51/42 ,  C01G53/44 ,  H01M4/02 ,  H01M4/1315

Abstract: A positive electrode active material has a small difference in a crystal structure between the charged state and the discharged state. For example, the crystal structure and volume of the positive electrode active material, which has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of approximately 4.6 V, are less likely to be changed by charging and discharging as compared with those of a known positive electrode active material. In order to form the positive electrode active material having the pseudo-spinel crystal structure in the charged state, it is preferable that a halogen source such as a fluorine and a magnesium source be mixed with particles of a composite oxide containing lithium, a transition metal, and oxygen, which is synthesized in advance, and then the mixture be heated at an appropriate temperature for an appropriate time.

公开(公告)号：US11670770B2

公开(公告)日：2023-06-06

申请号：US17036740

申请日：2020-09-29

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masahiro Takahashi ,  Mayumi Mikami ,  Yohei Momma ,  Teruaki Ochiai ,  Jyo Saitou

IPC: H01M4/525 ,  C01G51/00 ,  C01G53/00 ,  H01M10/0525 ,  H01M4/02

CPC classification number: H01M4/525 ,  C01G51/66 ,  C01G53/66 ,  H01M10/0525 ,  C01P2002/32 ,  C01P2002/52 ,  C01P2002/72 ,  C01P2002/77 ,  C01P2002/85 ,  C01P2002/88 ,  C01P2004/04 ,  C01P2006/40 ,  C01P2006/42 ,  H01M2004/028

Abstract: A positive electrode active material has a small difference in a crystal structure between the charged state and the discharged state. For example, the crystal structure and volume of the positive electrode active material, which has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of approximately 4.6 V, are less likely to be changed by charging and discharging as compared with those of a known positive electrode active material. In order to form the positive electrode active material having the pseudo-spinel crystal structure in the charged state, it is preferable that a halogen source such as a fluorine and a magnesium source be mixed with particles of a composite oxide containing lithium, a transition metal, and oxygen, which is synthesized in advance, and then the mixture be heated at an appropriate temperature for an appropriate time.