Li-Ni COMPOSITE OXIDE PARTICLES AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

Patent metadata

Field	Value
Publication number	US-2020403241-A1
Application number	US-201916975280-A
Country	US
Kind code	A1
Filing date	Mar 1, 2019
Priority date	Mar 2, 2018
Publication date	Dec 24, 2020
Grant date	—

Abstract

The present invention provides positive electrode active substance particles comprising a lithium nickelate composite oxide which have a high energy density and are excellent in repeated charge/discharge cycle characteristics when charging at a high voltage, as well as a non-aqueous electrolyte secondary battery. The present invention relates to positive electrode active substance particles each comprising a core particle X comprising a lithium nickelate composite oxide having a layer structure which is represented by the formula: Li 1+a Ni 1-b-c Co b M c O 2 wherein M is at least one element selected from the group consisting of Mn, Al, B, Mg, Ti, Sn, Zn and Zr, a is a number of −0.1 to 0.2 (−0.1·a·0.2), b is a number of 0.05 to 0.5 (0.05·b·0.5) and c is a number of 0.01 to 0.4 (0.01·c·0.4); and a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si and having an average film thickness of 0.2 to 5 nm, in which a crystal phase having a layered rock salt structure and comprising Ni 2+ ions is present in the form of a layer between the core particle X and the coating compound Y.

First claim

1 . Positive electrode active substance particles each comprising:
a core particle X comprising a lithium nickelate composite oxide having a layer structure which is represented by the formula:
Li 1+a Ni 1-b-c Co b M c O 2

wherein M is at least one element selected from the group consisting of Mn, Al, B, Mg, Ti, Sn, Zn and Zr; a is a number of −0.1 to 0.2 (−0.1·a·0.2); b is a number of 0.05 to 0.5 (0.05·b·0.5); and c is a number of 0.01 to 0.4 (0.01·c·0.4); and
a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si and having an average film thickness of 0.2 to 5 nm,
in which a crystal phase having a layered rock salt structure and comprising Ni 2+ ions is present in the form of a layer between the core particle X and the coating compound Y.

2 . The positive electrode active substance particles according to claim 1 , wherein an average valence of Ni in the positive electrode active substance particles is 2.80 to 3.10.

3 . The positive electrode active substance particles according to claim 1 , wherein a content of lithium hydroxide LiOH in the positive electrode active substance particles is not more than 0.50% by weight, a content of lithium carbonate Li 2 CO 3 in the positive electrode active substance particles is not more than 0.65% by weight, and a weight ratio of the content of the lithium carbonate to the content of the lithium hydroxide is not less than 0.9.

4 . The positive electrode active substance particles according to claim 1 , wherein the positive electrode active substance particles have a BET specific surface area of 0.05 to 0.70 m 2 /g, a median diameter D 50 of aggregated particles of 1 to 30 μm, and a 2% powder pH value of not more than 11.6.

5 . A non-aqueous electrolyte secondary battery comprising a positive electrode active substance that at least partially comprises the positive electrode active substance particles as claimed in claim 1 .

Assignees

• Toda Kogyo Corp

Inventors

• Watanabe Hiroyasu
• Sun Xiang
• Fetterer Mitchell

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• C01P2004/45

  Aggregated particles or particles with an intergrown morphology · CPC title

• C01P2006/60

  Optical properties, e.g. expressed in CIELAB-values · CPC title

• C01P2006/40

  Electric properties · CPC title