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-2020212442-A1
Application number	US-202016805990-A
Country	US
Kind code	A1
Filing date	Mar 2, 2020
Priority date	Jan 15, 2016
Publication date	Jul 2, 2020
Grant date	—

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

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; 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 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; 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 the positive electrode active substance particles as claimed in claim 1 , 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; 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

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/0471

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

• H01M4/0428

  Chemical vapour deposition · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title