Lithium nickelate-based positive electrode active substance particles and process for producing the same, and non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-11552292-B2
Application number	US-202016805990-A
Country	US
Kind code	B2
Filing date	Mar 2, 2020
Priority date	Jan 15, 2016
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

The present invention provides lithium nickelate-based positive electrode active substance particles having a high energy density which are excellent in charge/discharge cycle characteristics when highly charged, and hardly suffer from generation of gases upon storage under high-temperature conditions, and a process for producing the positive electrode active substance particles, 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: Li1+aNi1−b−cCobMcO2 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); a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si; and a coating compound Z comprising an Li element, in which a content of lithium hydroxide LiOH in the positive electrode active substance particles is not more than 0.40% by weight, a content of lithium carbonate Li2CO3 in the positive electrode active substance particles is not more than 0.65% by weight, and a weight ratio of the content of lithium carbonate to the content of lithium hydroxide is not less than 1.

First claim

The invention claimed is:

1. A process for producing a Positive electrode active substance particles, each Positive electrode active substance particles 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; and wherein: −0.1≤a≤0.2; 0.05≤b≤0.5; and 0.01≤c≤0.4;
a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si; and
a coating compound Z comprising an Li element, in which a content of lithium hydroxide LiOH in the positive electrode active substance particles is not more than 0.40% 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 lithium carbonate to the content of lithium hydroxide is not less than 1, comprising the steps of:
forming the coating compound Y on a surface of the core particle X by a vapor phase epitaxy method to form a resulting particle; and then subjecting the resulting particle to humidification treatment and heat treatment in atmospheric air at a temperature of 150 to 450° C. to form the coating compound Z on the particle.

2. A process for producing positive electrode active substance particles, each positive electrode active substance particles 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; and wherein: —0.1≤a≤0.2; 0.05≤b≤0.5; and 0.01≤c≤0.4;
a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si; and
a coating compound Z comprising an Li element,
in which a content of lithium hydroxide LiOH in the positive electrode active substance particles is not more than 0.40% 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 lithium carbonate to the content of lithium hydroxide is not less than 1,
the process comprising the steps of:
subjecting the core particle X to humidification treatment and heat treatment in atmospheric air at a temperature of 150 to 450° C. to form the coating compound Z on a surface of the core particle X to form a resulting particle; and then forming the coating compound Y on the resulting particle by a vapor phase epitaxy method.

Assignees

• Toda Kogyo Corp

Inventors

• Watanabe Hiroyasu
• Sun Xiang

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M10/0525

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

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• C23C16/45553

  characterized by the use of precursors specially adapted for ALD · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title