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Preparation method of gel polymer lithium ion battery

A lithium-ion battery and polymer technology, applied in the field of preparation of gel lithium-ion batteries, can solve the problems of poor performance, serious discharge polarization, poor conductivity, etc., achieve high ability to absorb electrolyte, improve safety, The effect of electrical conductivity

Inactive Publication Date: 2019-04-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the conductivity is poor, and the polarization of high current discharge is relatively serious, so the performance at high magnification is not good.

Method used

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  • Preparation method of gel polymer lithium ion battery
  • Preparation method of gel polymer lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: Preparation of NaCl-KCl eutectic salt

[0048] Add NaCl (45g) and KCl (55g) into a ball mill jar, mill at a speed of 700rpm for 1 hour, take it out and put it in a crucible, heat it in air at 700°C for 2 hours, and cool it to 25°C to obtain NaCl-KCl eutectic salt.

Embodiment 2

[0049] Example 2: Preparation of graphene-loaded nano-boron

[0050] Take the NaCl-KCl eutectic salt (30g) prepared in Example 1, add glucose monohydrate, melamine, metaboric acid and NaCl-KCl eutectic salt in a ball mill tank at a mass ratio of 4:2:1:300, and rotate 700rpm ball milling and mixing for 2 hours to prepare the precursor of graphene-loaded nano-boron-lithium;

[0051] After heating up to 110°C for 2 hours under nitrogen atmosphere, vacuumize and heat up to 440°C for 8 hours, then heat up to 900°C for 2 hours, three times at a heating rate of 10°C / min, and then cool to room temperature to obtain salt-containing Graphene supports nano boron. The salt content was washed away with deionized water, and then vacuum-dried to obtain nano-boron supported on graphene.

Embodiment 3

[0052] Example 3: Preparation of Nafion-PEO blended resin solution

[0053] 5g of PEO (polyethylene oxide) was added to 95g of a proton-type perfluorosulfonic acid resin solution with a mass content of 5wt% produced by DuPont Company of the United States, and stirred to dissolve to obtain a Nafion-PEO blended resin solution.

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Abstract

The invention relates to the preparation technology of a gel lithium ion battery, and aims to provide a preparation method for a gel-state polymer lithium ion battery. The preparation method comprises the steps of performing ball milling and mixing on glucose monohydrate, melamine, metaboric acid and NaCl-KCl eutectic salt, and heating the mixture in a nitrogen atmosphere for three times and then cooling to the room temperature; cleaning off salt content by deionized water and performing vacuum drying; performing mixing and grinding on obtained graphene-loaded nanometer boron and acetylene black, and Nafion-PEO co-mixed resin solution, and mixing the mixture into paste shape to coat foamed nickel; drying in the shade and pressing and shaping to obtain a negative electrode; performing arrangement on a positive electrode, a diaphragm and the negative electrode in sequence and performing pressing and shaping, and then carrying out heat treatment in a nitrogen atmosphere to obtain a film electrode, and immersing the film electrode in an electrolyte for 2h to obtain a cell; and assembling a button type gel-state polymer lithium ion battery by the cell. By adoption of the preparation method, a free-state electrolyte does not exist, so that the safety of the lithium ion battery can be remarkably improved, the electrode structural stability can be improved, high-current discharge can be promoted, and a safe and reliable high-energy power battery can be provided for an electric vehicle.

Description

technical field [0001] The invention relates to a preparation method of a gel lithium ion battery, more specifically, the invention relates to a preparation method of a gel state polymer lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. [0003] To date, most commercial Li-ion batteries have used organic electrolyte solutions as ion-conducting layers. Using organic electrolyte solutions, high ionic conductivity can be achieved, resulting in good performance of the device. However, organic electrolytic solutions ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M4/36H01M4/38H01M4/485H01M4/62H01M10/0525H01M10/0565H01M10/058
CPCH01M4/366H01M4/38H01M4/485H01M4/625H01M10/0525H01M10/0565H01M10/058H01M50/411Y02E60/10Y02P70/50
Inventor 李睿刘宾虹李洲鹏
Owner ZHEJIANG UNIV
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