Gel type polymer electrolyte framework material prepared from low-crystal porous nano fibers

A technology of polymer materials and nanofibers, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of limiting the practical application of polymer electrolytes, low ion conductivity and energy density, and low solubility of lithium salts, and achieve stability Electrochemical window, good charge and discharge performance, effect of reducing crystallinity

Inactive Publication Date: 2015-06-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if a polymer with ion transport function is used as the skeleton, since the migration of lithium ions is mainly carried out in the amorphous region of the polymer, and the solubility of lithium salt in the amorphous polymer is low, the migration number is small, and the liquid electrolyte Compared with gel-type polymer electrolytes, the ionic conductivity and energy density at room temperature are still relatively low, which limits the practical application of polymer electrolytes.
For example, in the Chinese patent CN101062987A, polyvinylidene fluoride, acrylonitrile-polyethylene glycol monomethyl ether methacrylate copolymer are used as raw materials, and lithium hexafluorophosphate carbonate is used as an electrolyte to prepare a porous gel polymer Electrolyte, although the process is simple, no pollution to the environment, and the material strength is high, but its room temperature ionic conductivity is only 1.6×10 -3 S cm -1

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The polymer electrolyte skeleton material has a porosity of 72%, a saturated liquid absorption rate of 950% at room temperature, and a retention rate of 91% after being placed for 15 days; the lithium ion conductivity of the polymer electrolyte at room temperature is 4.6×10 -3 S cm -1 , the electrochemical stability window is 4.8V. A half-battery was assembled with a lithium metal sheet as the negative electrode and lithium cobaltate as the positive electrode. The constant current charge and discharge performance was tested. The charge and discharge rate was 0.1C. The capacity was stable in the first 50 cycles, and the capacity was 90% of the initial capacity after 50 cycles. .

[0022]

[0023] Example 2:

Embodiment 2

[0025] The polymer electrolyte skeleton material has a porosity of 73%, a saturated liquid absorption rate at room temperature of 970%, and a retention rate of 91% after being placed for 15 days; the lithium ion conductivity of the polymer electrolyte at room temperature is 4.5×10 -3 S cm -1 , the electrochemical stability window is 4.7V. A half-battery was assembled with a lithium metal sheet as the negative electrode and lithium cobaltate as the positive electrode. The constant current charge and discharge performance was tested. The charge and discharge rate was 0.1C. The capacity was stable in the first 50 cycles, and the capacity was 90% of the initial capacity after 50 cycles. .

[0026]

[0027] Example 3:

Embodiment 3

[0029] The porosity of the polymer electrolyte skeleton material is 76%, the saturated liquid absorption rate at room temperature is 1020%, and the retention rate of the absorbed electrolyte after 15 days of storage is 92%; the lithium ion conductivity of the polymer electrolyte at room temperature is 4.9×10 -3 S cm -1 , the electrochemical stability window is 4.7V. A half-battery was assembled with a lithium metal sheet as the negative electrode and lithium cobalt oxide as the positive electrode. The constant current charge and discharge performance was tested. The charge and discharge rate was 0.1C. The capacity in the first 50 cycles was stable, and the capacity after 50 cycles was 91% of the initial capacity. .

[0030]

[0031] Example 4:

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PUM

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Abstract

The invention relates to a preparation method of a gel type polymer electrolyte framework material based on low-crystal porous nano fibers, and belongs to the field of polymer lithium ion batteries. The preparation method comprises the following steps: (1) preparing a blend type polymer electrostatic spinning solution; (2) preparing a blend type polymer nano fiber with a porous surface by utilizing an electrostatic spinning technique; and (3) drying and cutting a nano fiber film, and stacking and pressing to form a polymer gel electrolyte framework. According to the electrolyte framework frame, crystallization is inhibited via the blending of a polymer and an electrostatic spinning technology; the surface porous nano fiber and the film thereof have very high adsorption and long-lasting retentivity for electrolyte; the prepared gel type polymer electrolyte is high in ion conductivity and high in energy density, has a stable electrochemical window and good charge and discharge performances, and can be applied to the preparation of secondary lithium ion batteries.

Description

technical field [0001] The invention relates to a preparation method of a gel-type polymer electrolyte framework material based on low-crystalline porous nanofibers, belonging to the field of polymer lithium-ion batteries. [0002] Background technique [0003] Polymer electrolytes not only have good ion conductivity, but also have the characteristics of light weight, corrosion resistance, and easy molding that are unique to polymer materials. They are in line with the development trend of safe, efficient, and environmentally friendly new energy sources, and can be made into large-area ultra-thin The thin film ensures full contact with the electrodes, adapting to the development of electronic products towards miniaturization and light weight. [0004] Since pure solid polymer electrolytes realize ion conduction through the movement of polymer chain segments in the amorphous region, the room temperature ion conductivity is low, and the application range is limited. The curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCY02E60/10
Inventor 隋刚张珍珍杨小平毕海涛
Owner BEIJING UNIV OF CHEM TECH
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