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Title:
POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2021/054468
Kind Code:
A1
Abstract:
[Problem] To provide a positive electrode active material which, when used in a lithium ion secondary battery, is capable of better reducing positive electrode resistance and achieving more favorable output characteristics. [Solution] This positive electrode active material comprises: lithium transition-metal-containing complex oxide particles that include an additive element M1; and a coating layer that comprises a metal complex oxide containing Li and a metal element M2 and that is provided to at least a part of the surface of the particles. The particles have a d50 of 3.0-7.0 μm, a BET specific surface area of 2.0-5.0 m2 /g, a tapped bulk density of 1.0-2.0 g/cm3, and an oil absorption amount of 30-60 ml/100g. Among primary particles, each of a plurality of primary particles having a primary particle diameter in a range of 0.1-1.0 μm has: a coefficient of variation of M1 concentration which is not greater than 1.5; and an amount of M2 which is 0.1-1.5 at% with respect to the total number of atoms of Ni, Mn, and Co contained in the complex oxide particle.

Inventors:
HAYASHI TETSUTATO (JP)
BONG SHUN KAI (JP)
SUGANUMA SHINSUKE (JP)
KATO TOSHIHIRO (JP)
Application Number:
PCT/JP2020/035590
Publication Date:
March 25, 2021
Filing Date:
September 18, 2020
Export Citation:
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Assignee:
SUMITOMO METAL MINING CO (JP)
International Classes:
C01G53/00; H01M4/36; H01M4/505; H01M4/525
Domestic Patent References:
WO2018021557A12018-02-01
WO2014195995A12014-12-11
WO2012131881A12012-10-04
WO2014181891A12014-11-13
Foreign References:
JP2017016753A2017-01-19
JP2017091664A2017-05-25
JP2018104276A2018-07-05
JP2016126909A2016-07-11
JP2012246199A2012-12-13
JP2018104276A2018-07-05
Other References:
See also references of EP 4032859A4
Attorney, Agent or Firm:
KIWA INTERNATIONAL (JP)
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