Nonaqueous electrolyte secondary battery porous layer

Patent metadata

Field	Value
Publication number	US-10553906-B2
Application number	US-201816168891-A
Country	US
Kind code	B2
Filing date	Oct 24, 2018
Priority date	Oct 24, 2017
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

The present invention provides a nonaqueous electrolyte secondary battery including a porous layer which includes an organic filler in which Na element, Al element, and/or K element are contained, a total amount of the Na element, the Al element, and the K element contained falling within a certain range. The nonaqueous electrolyte secondary battery porous layer allows the nonaqueous electrolyte secondary battery to have an excellent battery capacity recovery rate after storage at a constant-voltage charge at a high temperature.

First claim

The invention claimed is:

1. A nonaqueous electrolyte secondary battery porous layer comprising:
an organic filler,
the organic filler containing at least one metallic element selected from the group consisting of Na element, Al element, and K element so that a total amount of the Na element, the Al element, and the K element contained in the organic filler satisfies the following formula:
10 (mg/kg)≤the total amount of the Na element, the Al element, and the K element relative to a total weight of the organic filler≤1000 (mg/kg).

2. The nonaqueous electrolyte secondary battery porous layer as set forth in claim 1 , further comprising:
a binder resin.

3. The nonaqueous electrolyte secondary battery porous layer as set forth in claim 2 , wherein
the binder resin is at least one resin selected from the group consisting of a polyolefin, a (meth)acrylate-based resin, a fluorine-containing resin, a polyamide-based resin, a polyester-based resin, and a water-soluble polymer.

4. The nonaqueous electrolyte secondary battery porous layer as set forth in claim 3 , wherein
the polyamide-based resin is an aramid resin.

5. A nonaqueous electrolyte secondary battery laminated separator comprising:
a polyolefin porous film; and
a nonaqueous electrolyte secondary battery porous layer recited in claim 1 , the nonaqueous electrolyte secondary battery porous layer being disposed on at least one surface of the polyolefin porous film.

6. A nonaqueous electrolyte secondary battery member comprising:
a positive electrode;
a nonaqueous electrolyte secondary battery porous layer recited in claim 1 ; and
a negative electrode,
the positive electrode, the nonaqueous electrolyte secondary battery porous layer, and the negative electrode being arranged in this order.

7. A nonaqueous electrolyte secondary battery comprising:
a nonaqueous electrolyte secondary battery porous layer recited in claim 1 .

8. A nonaqueous electrolyte secondary battery member comprising:
a positive electrode;
a nonaqueous electrolyte secondary battery laminated separator recited in claim 5 ; and
a negative electrode,
the positive electrode, the nonaqueous electrolyte secondary battery laminated separator, and the negative electrode being arranged in this order.

9. A nonaqueous electrolyte secondary battery comprising:
a nonaqueous electrolyte secondary battery laminated separator recited in claim 5 .

Assignees

• Sumitomo Chemical Co

Inventors

• Yamamoto Takuji
• Kurakane Kosuke
• Iwata Shizuka

Classifications

• H01M10/058 Primary

  Construction or manufacture · CPC title

• H01M10/0525

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

• H01M4/624

  Electric conductive fillers · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2/16

  Electricity · mapped topic