POSITIVE ELECTRODE FOR SECONDARY BATTERY, AND SECONDARY BATTERY

Title:

POSITIVE ELECTRODE FOR SECONDARY BATTERY, AND SECONDARY BATTERY

Document Type and Number:

WIPO Patent Application WO/2021/220744

Kind Code:

A1

Abstract:

This secondary battery comprises: a positive electrode that contains a positive electrode active substance layer; a negative electrode; and an electrolyte solution. The positive electrode active substance layer contains a layered rock salt-type lithium-nickel composite oxide represented by formula (1). When a surface of the positive electrode active substance layer is analyzed using X-Ray photoelectron spectroscopy, the ratio X of the concentration of Al atoms relative to the concentration of Ni atoms satisfies the condition represented by formula (2). When an inner part (depth of 100 nm) of the positive electrode active substance layer is analyzed using X-Ray photoelectron spectroscopy, the ratio Y of the concentration of Al atoms relative to the concentration of Ni atoms satisfies the condition represented by formula (3). The ratio Z of the ratio X relative to the ratio Y satisfies the condition represented by formula (4).　Formula (1): LiaNi1-b-c-d CobAlcMdOe (M is at least one type selected from among Fe, Mn, Cu, Zn, Cr, V, Ti, Mg and Zr. a, b, c, d and e satisfy the relationships 0.8 < a < 1.2, 0.06 ≤ b ≤ 0.18, 0.015 ≤ c ≤ 0.05, 0 ≤ d ≤ 0.08, 0 < e < 3, 0.1 ≤ (b + c + d) ≤ 0.22, and 4.33 ≤ (1-b-c-d)/b ≤ 15.0)　Formula (2): 0.30 ≤ X ≤ 0.70 Formula (3): 0.16 ≤ Y ≤ 0.37 Formula (4): 1.30 ≤ Z ≤ 2.52

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Inventors:

ONO TAKAMASA (JP)
OUKI ATSUSHI (JP)
KURATSUKA MASAKI (JP)
FUJIKAWA TAKASHIGE (JP)
SOEDA RYUJI (JP)
TAKAHASHI SHO (JP)
AKIYAMA YOSHIHITO (JP)
KONO YOSUKE (JP)
NISHIYAMA SHOICHI (JP)
ASANUMA TAKEO (JP)
HAYAZAKI SHINJI (JP)

Application Number:

PCT/JP2021/014724

Publication Date:

November 04, 2021

Filing Date:

April 07, 2021

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Assignee:

MURATA MANUFACTURING CO (JP)

International Classes:

C01G53/00; H01G11/06; H01G11/46; H01G11/50; H01G11/78; H01M4/131; H01M4/505; H01M4/525; H01M10/052; H01M10/0566; H01M10/0567; H01M50/10

Domestic Patent References:

WO2020059803A1	2020-03-26
WO2019021806A1	2019-01-31

Foreign References:

JP2005108738A	2005-04-21
JP2012230898A	2012-11-22
JP2017188211A	2017-10-12
JP2010129471A	2010-06-10
JP2001196063A	2001-07-19

Attorney, Agent or Firm:

TSUBASA PATENT PROFESSIONAL CORPORATION (JP)

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