POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, MIXED POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, ELECTRODE FOIL, AND LITHIUM ION SECONDARY BATTERY

WIPO Patent Application WO/2024/004942

A1

[Problem] To provide a positive electrode active material for a lithium ion secondary battery which suppresses the used amount of the precious metal Co as much as possible and has excellent cycle characteristics, the main component of said positive electrode active material being an Li-Ni-Co-Al or Li-Ni-Co-Mn composite oxide. [Solution] A positive electrode active material for a lithium ion secondary battery which has excellent charging/discharging cycle characteristics and rate characteristics, said positive electrode active material being characterised by being a columnar structure formed by the bonding of a particulate material comprising a composite oxide, the columnar structure having morphological features represented by general formula (1) and being composed of a chemical structure represented by general formula (2).　(Expression 1) 1.5 ≤ G/T ≤ 30.0 ... (1) In general formula (1), G/T represents the aspect ratio of the columnar structure, G represents the length (μm) of the long axis of the columnar structure, and T represents the length (μm) of the short axis of the columnar structure.　(Compound 1) LiXA(1-Z)BZO2 ... (2) In general formula (2), A is two or more selected from Ni, Co, Mn and Al, B is Mg or Zr, and z represents 0.00 ≤ z ≤ 0.10.

KUROKAWA TAKAFUMI (JP)
MAKI FUMIHIKO (JP)

PCT/JP2023/023582

January 04, 2024

June 26, 2023

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NIPPON KAGAKU SANGYO KK (JP)

H01M4/525; H01M4/36; H01M4/505

WO2015198676A1	2015-12-30
WO2014061399A1	2014-04-24
WO2008126370A1	2008-10-23
WO2015198711A1	2015-12-30
WO2021224092A1	2021-11-11

JP2014129188A

2014-07-10

TOTSUKA Tomoyuki (JP)

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