Title:
POSITIVE ELECTRODE ACTIVE MATERIAL, SECONDARY BATTERY, ELECTRONIC DEVICE, AND VEHICLE
Document Type and Number:
WIPO Patent Application WO/2020/099978
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, element X, and fluorine, and has a region having a rock salt-type structure and having a space group represented by R-3m, wherein element X is at least one selected from among elements having properties in which ΔE3 is smaller than ΔE4, where ΔE3 is a value obtained by subtracting the stabilization energy of an unsubstituted state from the stabilization energy of a substituted state in which substitutions are present at lithium sites of lithium cobaltate, ΔE4 is a value obtained by subtracting the stabilization energy of an unsubstituted state from the stabilization energy of a substituted state in which substitutions are present at cobalt sites of lithium cobaltate, and ΔE3 and ΔE4 are calculated through first principle calculation.
Inventors:
MIKAMI MAYUMI (JP)
TAJIMA RYOTA (JP)
TAJIMA RYOTA (JP)
Application Number:
PCT/IB2019/059464
Publication Date:
May 22, 2020
Filing Date:
November 05, 2019
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB (JP)
International Classes:
C01G53/00; C01G51/00; H01M4/525
Foreign References:
| JP2018088407A | 2018-06-07 | |||
| JP2003151549A | 2003-05-23 | |||
| JP2019179758A | 2019-10-17 | |||
| JPH0917430A | 1997-01-17 | |||
| JP2016091633A | 2016-05-23 | |||
| JP2017162790A | 2017-09-14 |
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