Title:
POSITIVE ELECTRODE ACTIVE MATERIAL AND SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2020/104881
Kind Code:
A1
Abstract:
Provided is a positive electrode active material for a lithium ion secondary battery having high capacity and excellent charge-discharge cycle characteristics. The positive electrode active material contains lithium, cobalt, and oxygen, wherein the spin density attributable to divalent cobalt ions and tetravalent cobalt ions is within a predetermined range. The positive electrode active material preferably further contains magnesium. A suitable magnesium concentration is expressed as a concentration relative to cobalt. In addition, the positive electrode active material preferably further contains fluorine.
Inventors:
MIKAMI MAYUMI (JP)
MOMMA YOHEI (JP)
OCHIAI TERUAKI (JP)
MOMMA YOHEI (JP)
OCHIAI TERUAKI (JP)
Application Number:
PCT/IB2019/059561
Publication Date:
May 28, 2020
Filing Date:
November 07, 2019
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB (JP)
International Classes:
H01M4/525
Foreign References:
| JP2000012022A | 2000-01-14 | |||
| JP2000277117A | 2000-10-06 | |||
| JP2018088407A | 2018-06-07 | |||
| JP2013541819A | 2013-11-14 | |||
| JP2016131156A | 2016-07-21 |
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