公开(公告)号：US20200295349A1

公开(公告)日：2020-09-17

申请号：US16885350

申请日：2020-05-28

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Ayae TSURUTA

IPC: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/13915 ,  H01M4/86

Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.

公开(公告)号：US20200152961A1

公开(公告)日：2020-05-14

申请号：US16609621

申请日：2018-04-19

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Yohei MOMMA ,  Mayumi MIKAMI ,  Aya UCHIDA ,  Kazuhito MACHIKAWA

IPC: H01M4/04 ,  H01M4/525 ,  H01M10/0525 ,  H01M4/583 ,  H01M4/505 ,  H01M4/485

Abstract: To provide a positive electrode active material with which the cycle performance of a secondary battery can be improved and a manufacturing method thereof. When a secondary battery is fabricated using, for a positive electrode, a positive electrode active material obtained by depositing a solid electrolyte on a lithium compound with the use of a graphene compound by spray-drying treatment and volatilizing carbon from the graphene compound by heat treatment, the decomposition of an electrolyte solution in contact with the positive electrode active material can be inhibited, contributing to improvement in the cycle performance of the secondary battery.

公开(公告)号：US20160064154A1

公开(公告)日：2016-03-03

申请号：US14937975

申请日：2015-11-11

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yumiko SAITO ,  Rie YOKOI ,  Mayumi MIKAMI

IPC: H01G11/48 ,  H01M4/36 ,  H01M4/60 ,  H01M4/48 ,  H01M4/137 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/1399 ,  H01G11/50 ,  H01G11/30 ,  H01G11/32 ,  H01G11/62 ,  H01G11/52 ,  H01M10/0525 ,  H01M4/04

CPC classification number: H01G11/48 ,  H01G11/30 ,  H01G11/32 ,  H01G11/50 ,  H01G11/52 ,  H01G11/62 ,  H01M4/0404 ,  H01M4/0471 ,  H01M4/13 ,  H01M4/131 ,  H01M4/137 ,  H01M4/1391 ,  H01M4/1399 ,  H01M4/366 ,  H01M4/386 ,  H01M4/387 ,  H01M4/483 ,  H01M4/606 ,  H01M4/662 ,  H01M10/0525 ,  H01M2004/027 ,  H01M2220/30 ,  Y02E60/13 ,  Y02T10/7022

Abstract: A mixture of amorphous PAHs and at least one of a carrier ion storage metal, a Sn compound, a carrier ion storage alloy, a metal compound, Si, Sb, and SiO2 is used as the negative electrode active material. The theoretical capacity of amorphous PAHs greatly exceeds that of a graphite-based carbon material. Thus, the use of amorphous PAHs enables the negative electrode active material to have a higher capacity than in the case of using the graphite-based carbon material. Further, addition of at least one of the carrier ion storage metal, the Sn compound, the carrier ion storage alloy, the metal compound, Si, Sb, and SiO2 to the amorphous PAHs enables the negative electrode active material to have a higher capacity than the case of only using the amorphous PAHs.