PVDF-HFP base composite porous polymer membrane and preparation method thereof

A PVDF-HFP, porous polymer technology, applied in the direction of structural parts, battery pack parts, electrical components, etc., can solve the problem of easy agglomeration of superfine powder fillers, poor interface compatibility, low ion migration number, etc. problem, to achieve the effect of improving interface performance and processing performance, improving mechanical strength, and increasing Li+ ion migration number

Inactive Publication Date: 2008-09-10
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of existing PVDF-HFP-based composite porous polymer membranes with poor interfacial compatibility, low ion mig

Method used

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  • PVDF-HFP base composite porous polymer membrane and preparation method thereof
  • PVDF-HFP base composite porous polymer membrane and preparation method thereof
  • PVDF-HFP base composite porous polymer membrane and preparation method thereof

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Experimental program
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specific Embodiment approach 1

[0010] Embodiment 1: In this embodiment, the PVDF-HFP-based composite porous polymer diaphragm is made of poly(vinylidene fluoride-hexafluoropropylene) (abbreviated as PVDF-HFP), polyvinylpyrrolidone and ultrafine powder filler; The mass ratio of sodium phosphate to poly(vinylidene fluoride-hexafluoropropylene) is 0.2-0.4:1, and the mass ratio of superfine powder filler to sodium hexametaphosphate is 0.5-1:1.

[0011] After testing, the conductivity of the product in this embodiment is high (the conductivity can reach 6.5×10 at 20° C. -3 S cm -1 ), its Li + The ion mobility number is as high as 0.85, and its electrochemical stability window is as high as 5.8V.

specific Embodiment approach 2

[0012] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the superfine powder filler is Al with a particle size of 10-100 nm. 2 o 3 、TiO 2 , ZrO 2 or SiO 2 . Others are the same as in the first embodiment.

[0013] In this embodiment, the influence of the superfine powder filler on the mechanical properties of the diaphragm is shown in Table 1.

[0014] Table 1

[0015] diaphragm

specific Embodiment approach 3

[0016] Embodiment 3: This embodiment differs from Embodiment 2 in that: the particle size of the superfine powder filler is 15-40 nm. Others are the same as in the second embodiment.

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Abstract

A PVDF-HFP group composite porous polymer membrane and a preparation method thereof relate to a composite porous polymer membrane and a preparation method thereof, and solve the problems that the prior PVDF-HFP group composite porous polymer membrane has poor interface compatibility, smaller transference number of ions, easy agglomeration of ultrafine powder filler and limited adding amount. The product is made from PVDF-HFP, sodium hexametaphosphate and ultrafine powder filler. The preparation method is as follows: (1) PVDF-HFP is dissolved in organic solvent; (2) sodium hexametaphosphate, ultrafine powder filler and distilled water are mixed and stirred; (3) the mixed solution obtained by step (2) is dripped into the mixed solution obtained by step (1) and then is evenly stirred, thereby obtaining the product through molding and drying forming. The dosage of the ultrafine powder filler occupies more than 41.7 percent of the total weight of raw materials and is evenly dispersed in the polymer matrix; meanwhile, the polymer electrolyte membrane has reinforced mechanical strength, high interface performance and excellent processability; moreover, the product has high conductivity with the transference number of ion Li+ reaching 0.85 and the electrochemical stability window as high as 5.8V.

Description

technical field [0001] The invention relates to a composite porous polymer membrane and a preparation method thereof Background technique [0002] Replacing the organic electrolyte in conventional secondary lithium batteries with polymer electrolytes can not only achieve lightweight, thin film, fast charging, and high energy density, but also solve safety problems such as leakage, combustion, and explosion. The polymer secondary lithium battery made of gel-type PVDF-HFP electrolyte has excellent performance, and can meet the needs of mobile phones, portable communication equipment, notebook computers and other equipment that are developing in the direction of small size, light weight and portability. need. Through the compounding of polymers, inorganic substances and organic plasticizers, the room temperature conductivity of the polymer electrolyte can be effectively improved, the interface condition of the electrode / electrolyte can be improved, and a certain mechanical str...

Claims

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Application Information

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IPC IPC(8): C08L27/12C08K3/32C08K3/22C08K3/36C08K3/24C08K3/34C08J5/22H01M2/16H01M50/403H01M50/446
CPCY02E60/10
Inventor 顾大明刘辉
Owner HARBIN INST OF TECH
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