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Composite microporous polymer electrolyte and its preparing method

A technology of microporous polymers and electrolytes, applied to secondary battery components, etc., can solve problems such as complex procedures and high temperature and temperature conditions, and achieve simplified film-making processes, low temperature and humidity requirements, and high crystallinity Falling effect

Inactive Publication Date: 2007-08-15
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a new type of inorganic material composite microporous polymer for the existing problems that microporous membranes need to use plasticizers, the process is complicated, extraction technology is required, and temperature and temperature conditions are high. Electrolyte and its preparation method

Method used

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  • Composite microporous polymer electrolyte and its preparing method
  • Composite microporous polymer electrolyte and its preparing method
  • Composite microporous polymer electrolyte and its preparing method

Examples

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Effect test

Embodiment 1

[0031] The SEM morphology of the microporous polymer electrolyte prepared by Bellcore technology for extracting plasticizers can be seen from Figure 1, showing an interpenetrating sponge-like microporous structure with high porosity, uniform distribution of pores, and a pore size of less than 5 μm. Room temperature ionic conductivity up to 10 -3 S cm -1 above.

Embodiment 2

[0033] Disperse the inorganic material SBA-15 mesoporous molecular sieve in the solvent acetone, the mass content of the inorganic material in the composite microporous polymer electrolyte is 5%, the amount of acetone is 2.5ml, ultrasonically oscillate for 10 minutes until the inorganic material is evenly dispersed; Add 0.4g of PVDF-HFP powder into the above-mentioned inorganic material suspension to dissolve PVDF-HFP to obtain a casting solution, and then let it stand to remove air bubbles; apply the casting solution on the film-forming substrate glass sheet; apply the casting solution The glass sheet of the membrane solution is dried in the air at a drying temperature of 50°C. After drying, it is vacuum-dried in a vacuum oven at a temperature of 60°C to obtain a composite microporous membrane of inorganic materials, which is called a dry film. ; Immerse the dry film in the electrolyte to obtain an activated gel-state composite microporous membrane containing the electrolyte, ...

Embodiment 3

[0034] The SEM morphology of the inorganic material composite microporous polymer electrolyte prepared by the present invention can be seen from Fig. 2, showing a rich network of pore structure, the pores are evenly distributed, and the pore diameter is less than 10 μm. Compared with Example 1, the difference in morphology between the two is related to their different pore-forming mechanisms. The room temperature ionic conductivity of the inorganic material composite microporous polymer electrolyte prepared by the present invention can reach 0.5×10 -3 S cm -1The above can meet the needs of the actual battery system. Example 3: The XRD diffraction spectrum of the inorganic material composite microporous polymer electrolyte prepared by the present invention is shown in FIG. 3 . PVDF-HFP powder is a mixture of crystalline and amorphous states, and the crystalline state is the main one. It can be observed from Figure 3(a) that there are two sharp peaks at 2θ=17.8° and 19.5°, and...

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Abstract

The present invention relates to a kind of composite micro porous polymer electrolyte with inorganic stuffing and its preparation process. The composite micro porous polymer electrolyte contains PVDF-HFP in 65-95 weight portions, and inorganic material of 5-35 wt%. The preparation process includes the following steps: dispersing inorganic material inside solvent and dissolving PVDF-HFP into the inorganic material suspension to obtain casting solution, and letting stand to eliminate bubbles; painting the casting solution onto filming substrate, stoving and vacuum drying to obtain dry film; and soaking the dry film inside electrolyte solution to obtain the composite micro porous film. The preparation process is simple and has relaxed temperature and humidity conditions, and the micro porous film has low crystallization degree, wide electrochemical window and stable interface formed with electrode.

Description

technical field [0001] The invention relates to a polymer electrolyte, in particular to a novel inorganic filler composite microporous polymer electrolyte suitable for polymer lithium ion batteries and a manufacturing method thereof. Background technique [0002] Polymer lithium-ion batteries are the second generation of commercial lithium-ion batteries after liquid lithium-ion batteries. Compared with liquid lithium-ion batteries, polymer lithium-ion batteries have the following advantages: First, polymer lithium-ion batteries overcome the problem of liquid leakage, are not easy to catch fire and explode, have higher safety, and are more suitable for use as high-power power sources; Second, the polymer lithium-ion battery is packaged in plastic without the need for a metal container, which reduces the battery mass and has a higher specific energy; third, the shape design of the polymer lithium-ion battery is more flexible and can be made into any shape. Therefore, the poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08L27/20C08K3/34H01M10/02
CPCY02E60/10
Inventor 姜艳霞陈作锋陈声培孙世刚
Owner XIAMEN UNIV