Nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-10777844-B2
Application number	US-201816223651-A
Country	US
Kind code	B2
Filing date	Dec 18, 2018
Priority date	Dec 19, 2017
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

The present invention provides a nonaqueous electrolyte secondary battery containing (i) a separator containing a polyolefin porous film, (ii) a porous layer containing a polyvinylidene fluoride-based resin, (iii) a positive electrode plate having a capacitance falling within a certain range, and (iv) a negative electrode plate having a capacitance falling within a certain range, the polyvinylidene fluoride-based resin containing an α-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.

First claim

The invention claimed is:

1. A nonaqueous electrolyte secondary battery comprising:
a nonaqueous electrolyte secondary battery separator containing a polyolefin porous film;
a porous layer containing a polyvinylidene fluoride-based resin;
a positive electrode plate having a capacitance of 1 nF to 1000 nF per measurement area of 900 mm 2 ; and
a negative electrode plate having a capacitance of 4 nF to 8500 nF per measurement area of 900 mm 2 ,
the porous layer being provided between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate, and
the polyvinylidene fluoride-based resin containing an α-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol % with respect to 100 mol % of a total amount of (i) the α-form polyvinylidene fluoride-based resin and (ii) a β-form polyvinylidene fluoride-based resin contained in the polyvinylidene fluoride-based resin,
where the amount of α-form polyvinylidene fluoride-based resin contained is calculated from (i) waveform separation of (α/2) observed at around −78 ppm in a 19 F-NMR spectrum obtained from the porous layer and (ii) waveform separation of {(α/2)+β} observed at around −95 ppm in the 19 F-NMR spectrum.

2. The nonaqueous electrolyte secondary battery as set forth in claim 1 , wherein
the positive electrode plate contains a transition metal oxide.

3. The nonaqueous electrolyte secondary battery as set forth in claim 1 , wherein
the negative electrode plate contains graphite.

4. The nonaqueous electrolyte secondary battery as set forth in claim 1 , further comprising:
another porous layer which is provided between (i) the nonaqueous electrolyte secondary battery separator and (ii) at least one of the positive electrode plate and the negative electrode plate.

5. The nonaqueous electrolyte secondary battery as set forth in claim 4 , wherein
the another porous layer contains at least one resin selected from the group consisting of a polyolefin, a (meth)acrylate-based resin, a fluorine-containing resin (excluding a polyvinylidene fluoride-based resin), polyamide-based resin, a polyester-based resin, and a water-soluble polymer.

6. The nonaqueous electrolyte secondary battery as set forth in claim 5 , wherein
the polyamide-based resin is an aramid resin.

Assignees

• Sumitomo Chemical Co

Inventors

• Arise Ichiro
• Ogata Toshihiko
• Suzuki Junji

Classifications

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/443

  Particulate material · CPC title

• H01M50/491

  Porosity · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title