Alumina and slurry containing the same, and alumina porous film using the same, laminated separator, nonaqueous electrolyte secondary battery and method for manufacturing nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-10662071-B2
Application number	US-201716075833-A
Country	US
Kind code	B2
Filing date	Sep 5, 2017
Priority date	Nov 14, 2016
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

Alumina having excellent electrolytic solution stability, a slurry containing the same, an alumina porous film using the same, a laminated separator, a nonaqueous electrolyte secondary battery and a method for manufacturing the nonaqueous electrolyte secondary battery are provided. Alumina is provided including one or more selected from K, Mg, Ca, Sr, Ba and La in the total amount of 200 to 50,000 ppm by mass, wherein a surface concentration of one or more elements is 0.5 to 20 at % in total. Alumina is provided in which in an infrared absorption spectrum of the alumina obtained by Fourier-transform infrared spectroscopy, a peak having an intensity larger than that of a baseline defined by a line segment connecting an intensity at 3,400 cm−1 and an intensity at 3,500 cm−1 and having a half width of 90 cm−1 or less, does not exist in a range of 3,400 to 3,500 cm−1.

First claim

The invention claimed is:

1. Alumina comprising one or more selected from the group consisting of K, Mg, Ca, Sr, Ba and La in the total amount of 200 to 50,000 ppm by mass, wherein
a surface concentration of the one or more elements selected from the group consisting of K, Mg, Ca, Sr, Ba and La is 0.5 to 20 atomic % in total;
wherein the surface concentration is the concentration of the element on the alumina surface measured by X-ray photoelectron spectroscopy; and wherein the alumina has a BET specific surface area of 1 to 20 m 2 /g, and the alumina is α alumina.

2. An alumina slurry comprising: alumina according to claim 1 ; a binder; and a solvent.

3. An alumina porous film comprising: the alumina according to claim 1 ; and a binder.

4. A laminated separator comprising: a separator; and the alumina porous film according to claim 3 .

5. A nonaqueous electrolyte secondary battery, wherein an alumina porous film including the alumina according to claim 1 is formed on at least one surface of a positive electrode, a negative electrode or a separator.

6. A method for manufacturing a nonaqueous electrolyte secondary battery, comprising: applying the alumina slurry according to claim 2 onto at least one surface of a positive electrode, a negative electrode or a separator, followed by drying the alumina slurry to form an alumina porous film.

Assignees

• Sumitomo Chemical Co

Inventors

• Ozaki Hirotaka
• Ando Hiroyuki

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/0525

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

• C01F7/02 Primary

  Aluminium oxide; Aluminium hydroxide; Aluminates · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M10/058

  Construction or manufacture · CPC title