Title:
電子機器
Document Type and Number:
Japanese Patent JP6752541
Kind Code:
B2
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.
Inventors:
Teruaki Ochiai
Takahiro Kawakami
Mayumi Mikami
Youma
Masahiro Takahashi
Ayane Tsuruta
Takahiro Kawakami
Mayumi Mikami
Youma
Masahiro Takahashi
Ayane Tsuruta
Application Number:
JP2019218364A
Publication Date:
September 09, 2020
Filing Date:
December 02, 2019
Export Citation:
Assignee:
Semiconductor Energy Laboratory Co., Ltd.
International Classes:
H01M4/525; H01M4/36; H01M4/485; H01M10/0525; H01M10/0566
Domestic Patent References:
| JP2004103566A | ||||
| JP2004342554A | ||||
| JP2015201432A | ||||
| JP2011181527A | ||||
| JP2012508444A |
Foreign References:
| WO2009057722A1 |
Attorney, Agent or Firm:
Masayuki Kanita