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Composite gel electrolyte film for secondary battery, and secondary battery

A gel electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, electrolytes, etc., can solve the problems of unrecorded composite membranes, etc., and achieve excellent fire resistance, increased ion conductivity, and less coloring Effect

Inactive Publication Date: 2012-10-24
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In addition, in Patent Document 13, for the purpose of providing a polymer electrolyte having excellent film strength, heat resistance, and non-aqueous electrolytic solution retention, it is described that a non-aqueous electrolyte is impregnated with a vinylidene copolymer. A polymer electrolyte, the vinylidene-based copolymer is composed of 35 mol% to 99 mol% of repeating units derived from VdF, 1 mol% to 50 mol% of repeating units derived from TFE, and monomers that can be copolymerized with them. mol% to 20 mol%, the melting point is above 80°C, and the crystallinity is 20 to 80%; however, in Patent Document 13, there is no description of a composite membrane formed of a polymer electrolyte and a porous membrane

Method used

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  • Composite gel electrolyte film for secondary battery, and secondary battery
  • Composite gel electrolyte film for secondary battery, and secondary battery
  • Composite gel electrolyte film for secondary battery, and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0080] Dissolve TFE / VdF / HFP (38 / 60 / 2 mol% ratio) copolymer in tetrahydrofuran (THF), coat it on a polyester (PET) film, dry it at 100°C for 15 minutes, and peel it off to make a thickness of 30 μm The electrolyte holding membrane (electrolyte holding membrane 1). The polymer had a melting point of 140°C.

[0081] A dumbbell (5 cm×3 cm short film (booklet)) was produced from the obtained electrolyte solution holding film 1, and the tensile elongation at break was measured with a tensile tester (RTC-1225A manufactured by ORIENTEC). The results are listed in Table 1.

[0082] Furthermore, the electrolyte swelling rate, ion conductivity, and ignitability of the obtained electrolyte holding membrane 1 were examined in the following points. The results are listed in Table 1.

[0083] (electrolyte swelling property)

[0084] The electrolyte holding film was cut into a size of 5mm × 20mm, and added to a solvent containing electrolyte (3 / 7 (volume ratio) of ethylene carbonate and eth...

reference example 2

[0107] In Reference Example 1, the electrolyte holding film 2 produced by the following method was used as the electrolyte holding film, and the tensile elongation at break, electrolyte swelling rate, ion conductivity, ignitability, Coloring during high-temperature operation and coloration during high-voltage operation are studied. The results are listed in Table 1.

[0108] (Fabrication of Electrolyte Retaining Membrane 2)

[0109] A TFE / VdF (20 / 80 mole %) copolymer was dissolved in methyl isobutyl ketone, coated on a PET film, dried at 100° C. for 15 minutes, and peeled off to produce an electrolyte holding membrane 2 with a thickness of 30 μm. The polymer had a melting point of 120°C.

Embodiment 1～6

[0143] In Reference Example 1, except that the electrolyte holding film was not used but the electrolyte holding film produced by the following method was used to cover the separators 1 to 6, the ion conductivity, ignitability, coloring during high-temperature operation, and Coloring at high voltage operation is studied. The results are listed in Table 3.

[0144] (Fabrication of Electrolyte Retaining Membrane Covered Separator 1)

[0145] Dissolve TFE / VdF / HFP (38 / 60 / 2 mol% ratio) copolymer in THF, apply it on a polyethylene separator (thickness 22 μm), and dry it at 80°C for 15 minutes to produce an electrolyte solution Separator 1 covered with a holding film layer (thickness 1 μm) (mass ratio of separator / VdF / TFE-based copolymer in electrolyte holding film layer: about 1 / 0.5).

[0146] (Fabrication of Electrolyte Retaining Membrane Covered Separator 2)

[0147] TFE / VdF / HFP (38 / 60 / 2 mole % ratio) copolymer and TFE / VdF / HFP (6 / 77 / 17 mole % ratio) copolymer rubber are mixed a...

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Abstract

Disclosed is a composite gel electrolyte film for a secondary battery, which has improved ion conductivity and excellent ignition resistance, while being insusceptible to coloration. Specifically disclosed is a composite gel electrolyte film for a secondary battery, which is composed of a gel electrolyte for a secondary battery and a porous film that is composed of at least one resin selected from the group consisting of polyethylenes, polypropylenes and polyimides. The gel electrolyte for a secondary battery is obtained by impregnating an electrolyte solution holding film with an nonaqueous electrolyte solution, and the electrolyte solution holding film contains a vinylidene fluoride copolymer resin that comprises a vinylidene fluoride unit and a tetrafluoroethylene unit at a vinylidene fluoride unit / tetrafluoroethylene unit molar ratio of from 55 / 45 to 95 / 5, while also containing a hexafluoropropylene unit in an amount of 0-10% by mole (with the total of the vinylidene fluoride unit, the tetrafluoroethylene unit and the hexafluoropropylene unit being 100% by mole).

Description

【Technical field】 [0001] The present invention relates to a gel electrolyte composite membrane for a secondary battery with increased ion conductivity, excellent fire resistance, and less coloring, and a secondary battery using the same. 【Background technique】 [0002] Secondary batteries, especially lithium secondary batteries, represented by electric vehicles (EVs), are strongly required to improve their performance as one of the decisive factors in countermeasures against global warming. [0003] Lithium secondary batteries have a basic structure in which a non-aqueous electrolyte is arranged between the positive electrode and the negative electrode through a separator as needed. Lithium secondary batteries are roughly divided into types that use electrolytes dissolved in solvents and types that use A type of solid electrolyte. Furthermore, in the type using the electrolytic solution, there are also a type in which the electrolytic solution is directly sealed and a gel e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01B1/06H01M10/052
CPCH01M10/0565H01M2300/0085H01M2300/0091H01B1/122Y02E60/10H01M10/052H01B1/06
Inventor 高明天坂田英郎佐薙知世中泽瞳有马博之一坂俊树
Owner DAIKIN IND LTD
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