Blended gel polymer electrolyte thin film with porous appearance and preparation method thereof

A gel polymer, electrolyte film technology, used in circuits, electrical components, secondary batteries, etc., can solve problems such as limited compatibility, differences in molecular structure, ionic conduction does not play any role, and achieve good mechanical properties, The effect of suppressing precipitation and high room temperature ionic conductivity

Inactive Publication Date: 2013-09-18
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional porous gel polymer electrolytes usually use polyvinylidene fluoride (PVDF) or polyvinylidene fluoride copolymerized perfluoropropylene (PVDF-HFP) as the polymer matrix, but such polymers are different from liquid electrolytes due to their molecular structure. Limited capacitive capacity, in addition the polymer matrix plays little role in ion conduction

Method used

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  • Blended gel polymer electrolyte thin film with porous appearance and preparation method thereof
  • Blended gel polymer electrolyte thin film with porous appearance and preparation method thereof
  • Blended gel polymer electrolyte thin film with porous appearance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Mix 80g of PEG800 with 27.5g of MDI, raise the temperature at 75°C, and react for 7 hours to form a prepolymer. Then, the temperature was adjusted to 75° C., 2.4 g of LiOH was gradually added to the reaction system, and the reaction was carried out for 4 hours to obtain a polyether-type polyurethane lithium salt.

[0019] (2) 5g of PVDF powder with molecular weight of Mn=1×105 was added to 60ml of the mixed solution of DMF and glycerol in a volume ratio of 8:1. After stirring at room temperature for 12 hours, 1g of polyether-type polyurethane lithium salt was added and then stirred. 12 hours to complete dissolution. The polymer solution was left to stand for debubbling, and then flatly spread on a glass plate with a spatula, and then dried in an oven at 110 °C for 24 hours. The porous morphology based polyether polyurethane lithium salt blend was prepared by thermally induced phase separation method. PVDF film.

[0020] (3) The polyether polyurethane lithium salt ...

Embodiment 2

[0025] (1) Mix 80g of PEG800 with 32.5g of MDI, raise the temperature at 90°C, and react for 5 hours to form a prepolymer. Then, the temperature was adjusted to 70° C., 7.2 g of LiOH was gradually added to the reaction system, and the reaction was carried out for 4.5 hours to obtain a polyether-type polyurethane lithium salt.

[0026] (2) 10g of PVDF powder with a molecular weight of Mn=1×106 was added to 110ml of a mixed solution of DMF and glycerol in a volume ratio of 8:1. After stirring at room temperature for 18 hours, 1g of polyether-type polyurethane lithium salt was added, and then Stir for 8 hours for complete dissolution. The polymer solution was left to stand for debubbling, and then flatly spread on a glass plate with a spatula, and then dried in an oven at 150 °C for 18 hours to prepare a polyether-polyurethane-based lithium salt blend with a porous morphology by a thermally induced phase separation method. PVDF film.

[0027] (3) The polyether polyurethane lith...

Embodiment 3

[0029] (1) Mix 80g of PEG800 with 30g of MDI, raise the temperature to 70°C, and react for 8 hours to form a prepolymer. Then, the temperature was adjusted to 65° C., 4.8 g of LiOH was gradually added to the reaction system, and the reaction was carried out for 5 hours to obtain a polyether-type polyurethane lithium salt.

[0030] (2) The molecular weight of 8g is M n =1×10 7 PVDF powder was added to a mixed solution of 90ml of DMF and glycerol in a volume ratio of 8:1. After stirring at room temperature for 15 hours, 1g of polyether-polyurethane lithium salt was added, and stirred for 6 hours until it was completely dissolved. The polymer solution was left to stand for debubbling, and then flatly coated on a glass plate with a spatula, and then dried in an oven at 120 °C for 20 hours to prepare a polyether-based polyurethane lithium salt blend with a porous morphology by a thermally induced phase separation method. PVDF film.

[0031] (3) The polyether polyurethane lithium s...

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Abstract

The invention discloses a blended gel polymer electrolyte thin film with porous appearance and a preparation method thereof. In the composition, a blended polymer film comprises a polyether polyurethane lithium salt and PVDF (polyvinylidene fluoride), the range of the weight ratio of the two is (1: 5)-(1: 10), and an adsorbed liquid electrolyte component in the composition accounts for 40-70% by weight of the total weight. The preparation method comprises the following preparation steps of: firstly preparing the polyether polyurethane lithium salt by condensation polymerization, then mixing the polyether polyurethane lithium salt and the PVDF, dissolving in a mixed solution of N' N-dimethylformamide and glycerol, adopting a thermally induced phase separation method to obtain the blended polymer porous film, drying the thin film, then adsorbing the liquid electrolyte, and activating to obtain the blended gel polymer electrolyte thin film, wherein the optimal ion conductivity can achieve 5.63*10<-3>Scm<-1> at the temperature of 30 DEG C, and an electrochemical window achieves 4.8V. A product disclosed by the invention has good prospects when applied to the fields of polymer lithium ion batteries and the like.

Description

technical field [0001] The invention relates to a blended gel polymer electrolyte film with porous morphology applied to a polymer lithium ion battery, and a preparation method of the blended gel electrolyte film. Background technique [0002] The excellent performance of lithium-ion batteries has become a hot spot in the research and development of secondary batteries today. Electrolyte plays a key role in lithium-ion batteries, and its performance is one of the important factors that determine battery performance. Currently, lithium ion secondary batteries generally use liquid electrolytes. However, it is limited by the heat resistance and voltage resistance of liquid electrolytes, and the use of liquid electrolytes is easy to leak, which often leads to safety problems. For example, the accident caused by the recent Boeing 737 fire may be caused by overcharging of the battery. of liquid electrolyte leakage. In order to solve the above-mentioned hidden dangers, it has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565C08J9/40C08L27/16C08L75/08C08G18/83C08G18/48
CPCY02E60/10
Inventor 李为立邢玉金杨刚
Owner JIANGSU UNIV OF SCI & TECH
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