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Preparation method and application of polyvinyl acetal-based gel polymer electrolyte

A polyvinyl acetal and gel polymer technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of limited assembly methods of lithium-ion batteries, poor electrochemical stability of gel films, and mechanical properties. Low-level problems, to achieve the effect of complete reaction, good thermal stability, and simple operation

Active Publication Date: 2015-01-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the commonly used gel polymer electrolytes generally have problems such as poor electrochemical stability of the gel film, gel leakage, low mechanical properties, and limited assembly methods of lithium-ion batteries.

Method used

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  • Preparation method and application of polyvinyl acetal-based gel polymer electrolyte
  • Preparation method and application of polyvinyl acetal-based gel polymer electrolyte

Examples

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preparation example Construction

[0029] The ion conductivity measuring method of the film-supported gel polymer electrolyte of the polyvinyl acetal base synthesized by the preparation method provided by the invention is described as follows:

[0030] The gel polymer electrolyte to be tested is clamped with stainless steel sheets to form a battery with ┃stainless steel ┃ polymer film ┃ stainless steel ┃ structure. The AC impedance test is carried out by the electrochemical workstation, and the ionic conductance of the gel polymer film can be calculated according to the following formula Rate σ:

[0031] σ=L / AR.

[0032] Among them, L is the thickness of the membrane, R is the volume resistance of the gel polymer electrolyte obtained by the AC impedance test, and A is the contact area of ​​the gel polymer electrolyte and the stainless steel electrode.

Embodiment 1

[0035] Weigh 0.3g polyvinyl formal (R is a hydrogen atom, molecular weight is 60000-80000, alcoholysis degree is 79%) in a glove box filled with argon gas and add it to 3g N,N-dimethylformamide, Magnetic stirring was used to dissolve completely, and a homogeneous pale yellow clear and transparent solution was prepared. The organic solvent used may be, but not limited to, N,N-dimethylformamide. Add 0.3 g of reactive diluent methyl acrylate monomer to the above solution, and magnetically stir for 5 hours to make it fully mixed. The reactive diluent used can be, but is not limited to, methyl acrylate monomer. Then add 0.01 g of photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone, and stir well to make it evenly mixed. The photoinitiator can be, but is not limited to, 2-hydroxy-2-methyl-1-phenyl-1-propanone. Add the above solution to its total mass, but not limited to, 1.5 times the liquid electrolyte (1mol / L lithium hexafluorophosphate dissolved in a mixed solvent of ethyle...

Embodiment 2

[0037] In a glove box filled with high-purity argon, weigh 0.3g of polyvinyl butyral (R is a propylene group, the molecular weight is about 70,000, and the degree of alcoholysis is 79%) and add it to 4.5g of dimethyl sulfoxide, and stir it magnetically. It was completely dissolved to prepare a homogeneous colorless transparent clear solution. The organic solvent used may be but not limited to dimethyl sulfoxide. Add reactive diluent methyl acrylate monomer 0.2 g to the above solution, and magnetically stir for 5 hours to make it fully mixed. The reactive diluent can be, but is not limited to, methyl acrylate monomer. Subsequently, 0.04 g of photoinitiator benzophenone (BP) was added, and stirred thoroughly for 3 hours. The photoinitiator can be, but is not limited to, benzophenone. Add the above solution to its total mass, but not limited to 2 times the liquid electrolyte (1mol / L lithium hexafluorophosphate dissolved in a mixed solvent of ethylene carbonate and dimethyl car...

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Abstract

The invention discloses a preparation method and an application of a polyvinyl acetal-based gel polymer electrolyte. According to the preparation method, the polyvinyl acetal polymers with the structures shown as the general formulae (1), (2), (3) and (4) are dissolved in an organic solvent system; and a reactive diluent and a photoinitiator are added into the liquid electrolyte in a certain ratio and are uniformly mixed to obtain a precursor solution; a lithium ion battery diaphragm is fully swelled and infiltrated by the precursor solution, and then is irradiated under the ultraviolet rays with the wavelength in the range of 200 to 365 nm; chemical cross linking happens to the obtained a diaphragm-supported gel polymer electrolyte, wherein R1 and R2 express a full acetal compound or a hemiacetal compound of aliphatic hydrocarbons or aromatic hydrocarbons with 1 to 13 hydrogen atoms or carbon atoms. The preparation method is easy to operate, and is suitable for continuous scale production of gel polymer electrolyte and in-situ film-forming production of polymer lithium ion batteries; moreover, the prepared gel polymer electrolyte has high ionic conductivity and a wide electrochemical stability window; the matching cycling performance with an electrode material is high; the liquid leakage pollution of the liquid electrolyte battery is avoided; the safety performance is high.

Description

[0001] technical field [0002] The invention belongs to the technical field of preparation and application of gel polymer electrolytes, and in particular relates to a preparation method of polyvinyl acetal-based gel polymer electrolytes and its application in lithium-ion batteries. [0003] Background technique [0004] The polymer lithium-ion battery was born in 1994. It has received widespread attention because it can avoid problems such as leakage of liquid electrolyte and leakage, and has the characteristics of strong plasticity and flexibility. [0005] The preparation of polymer electrolytes is the most critical technology in polymer lithium-ion batteries, which can be divided into all-solid polymer electrolytes and gel-state polymer electrolytes according to their morphology. The gel polymer electrolyte system that replaces liquid electrolytes in lithium-ion batteries has a high ionic conductivity close to that of liquid electrolytes, and has the characteristics of ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058C08F261/12C08F220/14C08F2/48
CPCC08F2/48C08F220/14C08F261/12H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 连芳关红艳潘笑容孙晓蒙刘春兰
Owner UNIV OF SCI & TECH BEIJING
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