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Separation film for secondary battery and the secondary battery

A secondary battery and separator technology, applied in the field of secondary batteries, to achieve the effects of high durability, resistance not easy to increase, and excellent heat resistance

Pending Publication Date: 2021-07-02
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Documents 1 to 2 and Patent Document 4, etc., there is no regulation at all about the molecular weight that is considered to be preferable from the viewpoint of adhesiveness with respect to the binder polymer for the composite porous membrane formed on the separator.

Method used

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  • Separation film for secondary battery and the secondary battery
  • Separation film for secondary battery and the secondary battery
  • Separation film for secondary battery and the secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0253]

[0254] Add F(CF 2 ) 5 COONH 4 is 3300ppm, and CH 2 = CFCF 2 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4The polymerization tank was sealed as an aqueous solution with a concentration of 200 ppm. Vacuumize the vacuum in the tank after replacing it with nitrogen, and put 400 cc equivalent amount of isopropanol as a chain transfer agent into the tank while vacuuming. Thereafter, a mixed gas monomer having a composition ratio of vinylidene fluoride (VdF) / tetrafluoroethylene (TFE) of 67 / 33 mol % was charged into the tank up to 0.8 MPaG while stirring at 70°C. Thereafter, an aqueous solution in which ammonium persulfate was dissolved in an amount corresponding to 100 ppm was injected with nitrogen gas to initiate a reaction. In order to maintain the pressure in the tank, a mixed monomer having a composition ratio of VdF / TFE of 67 / 33 mol % was additionally charged. When the added monomer reached 346 g, the stirring was adjusted to a low speed, and the gas in the tank was ...

Embodiment 2

[0271] Instead of using the aqueous fluoropolymer dispersion A used in Example 1, the following aqueous fluoropolymer dispersion B was used, except that the same operation as in Example 1 was performed to produce a composite porous membrane slurry, Separators and secondary batteries.

[0272]

[0273] Add F(CF 2 ) 5 COONH 4 is 3300ppm, and CH 2 = CFCF 2 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4 The polymerization tank was sealed as an aqueous solution with a concentration of 200 ppm. Vacuumize the vacuum in the tank after replacing it with nitrogen, and put 600 cc equivalent amount of isopropanol as a chain transfer agent into the tank while vacuuming with a syringe. Thereafter, a mixed gas monomer having a VdF / TFE composition ratio of 67 / 33 mol % was charged into the tank while stirring at 450 rpm at 70° C. to 0.8 MPaG. Thereafter, an aqueous solution of ammonium persulfate in an amount corresponding to 100 ppm was injected with nitrogen gas to initiate a reaction. In ...

Embodiment 3

[0281] Instead of using the aqueous fluoropolymer dispersion A used in Example 1, the following aqueous fluoropolymer dispersion C was used, except that the same operation as in Example 1 was performed to produce a composite porous membrane slurry, Separators and secondary batteries.

[0282]

[0283] Add F(CF 2 ) 5 COONH 4 is 3300ppm, and CH 2 = CFCF 2 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4 The polymerization tank was sealed as an aqueous solution with a concentration of 200 ppm. After replacing the vacuum in the tank with nitrogen, evacuate, and inject 800 cc equivalent amount of isopropanol as a chain transfer agent while evacuating with a syringe. Thereafter, a mixed gas monomer having a VdF / TFE composition ratio of 67 / 33 mol % was charged into the tank while stirring at 450 rpm at 70° C. to 0.8 MPaG. Thereafter, an aqueous solution in which ammonium persulfate was dissolved in an amount corresponding to 100 ppm was injected with nitrogen gas to initiate a reactio...

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Abstract

The present invention relates to a separation film for a secondary battery and the secondary battery. The secondary battery separator has excellent heat resistance and ion conductivity, has less heat-induced shrinkage, and is not easy to swell in the electrolyte at high temperatures. Moreover, a composite porous separation film containing binder polymers and inorganic particles (at least one selected from the group consisting of metal oxide particles and metal hydroxide particles) in the separation film is firmly bonded to a porous body .

Description

[0001] This application is a divisional application. The international application number of the original application is PCT / JP2014 / 082118, and the Chinese national application number of the original application is 201480065508.8. Separators and Secondary Batteries". 【Technical field】 [0002] The present invention relates to a separator for a secondary battery and a secondary battery. More specifically, the present invention relates to a separator suitable for secondary batteries such as lithium secondary batteries and a secondary battery using the same. 【Background technique】 [0003] Non-aqueous secondary batteries represented by lithium secondary batteries have high energy density and are widely used as main power sources of portable electronic devices such as mobile phones and notebook computers. In addition, electric vehicles (EVs) are expected to be one of the solutions to global warming. In lithium secondary batteries, further higher energy density is required, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/446H01M50/449H01M50/417H01M50/426H01M10/0525C08F214/22C08F214/26H01M50/451H01M50/489H01M50/497
CPCC08F214/22C08F214/262Y02E60/10H01M50/446H01M50/417H01M50/497H01M50/489H01M50/451H01M50/426H01M10/0525H01M50/443H01M50/449H01M50/491
Inventor 深谷伦行北原隆宏市川贤治岩松裕子井口贵视内田一畅斋田知秀一坂俊树藤泽学
Owner DAIKIN IND LTD
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