Polymer lithium ion battery preparation technique and products

A lithium-ion battery, ion battery technology, applied in secondary batteries, battery pack parts, final product manufacturing, etc., can solve the problems of insufficient ability to adsorb precursor solutions, high automation requirements, and high battery manufacturing costs, and achieve improved High-current charge-discharge performance and cycle performance, improved market competitiveness, and low battery manufacturing costs

Active Publication Date: 2008-01-02
广东风华新能源股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still big obstacles in the popularization of this technology. The main problem is that almost the whole process of battery production needs to be carried out in a dry environment, which requires high automation of equipment, large investment in the drying system, and high operating costs, resulting in very high battery manufacturing costs. High, the product price is difficult to compete with liquid batteries in the market
[0009] Although the on-site polymerization technology is very suitable for the large-scale production of polymer batteries, and the battery manufacturing cost is low, compared with other technologies, there is a big gap in the technical performance of its products
The main manifestations are: due to the low porosity of the diaphragm used in liquid batteries, the ability to adsorb the precursor solution is not enough, resulting in the insufficient stability and uniformity of the interface between the electrode and the diaphragm after polymerization, resulting in high internal resistance and low high-current discharge platform of the polymer battery

Method used

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  • Polymer lithium ion battery preparation technique and products
  • Polymer lithium ion battery preparation technique and products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Prepare the polymer battery as shown in Figure 1 according to the following method, in Figure 1, the reference numeral 1 represents the polymer three-dimensional network structure layer, 2 represents the positive pole, 3 represents the negative pole, 4 represents the positive pole tab, and 5 represents the negative pole tab, 6 represents a polymer adhesive layer, and 7 represents an outer packaging shell.

[0041] 1. Preparation of modified diaphragm:

[0042] The cross-linking agent butanediol diacrylate and polyvinylidene fluoride are mixed according to the mass ratio of 40%:60%, and then dissolved in acetone solvent. By adjusting the amount of solvent, the viscosity of the modified liquid is controlled at about 70psi. Then a polyethylene microporous membrane with a thickness of 16 micrometers was immersed in the above-mentioned modifying solution. After drying, a modified separator with a thickness of 20 microns was obtained.

[0043] 2. Preparation of battery pos...

Embodiment 2

[0053] 1. Preparation of modified diaphragm:

[0054] After mixing the crosslinking agent pentanediol diacrylate and the polyvinylidene fluoride-hexafluoropropylene copolymer at a mass ratio of 15:85, they are dissolved in tetrahydrofuran solvent. By adjusting the amount of solvent, the viscosity of the modified liquid is controlled at about 100psi. Then a polyethylene-polypropylene composite microporous membrane with a thickness of 25 microns was immersed in the above-mentioned modifying solution. After drying, a modified separator with a thickness of 35 microns was obtained.

[0055] 2. Preparation of battery positive and negative electrodes:

[0056] Weigh pentylene glycol diacrylate according to 0.25% and 0.5% of the solid content of the positive electrode and negative electrode slurries, and add them to the positive electrode and negative electrode slurries respectively. After stirring evenly, the pole piece is prepared according to the pole piece production process of...

Embodiment 3

[0065] 1. Preparation of modified diaphragm:

[0066] Dissolve polyvinylidene fluoride-hexafluoroethylene in acetone solvent, adjust the amount of solvent to control the viscosity of the modified liquid at about 40psi, and then impregnate the polyethylene-polypropylene microporous membrane with a thickness of 20 microns in the above modified solution, and dried to obtain a modified diaphragm with a thickness of 25 microns.

[0067] 2. Preparation of battery positive and negative electrodes:

[0068] Weigh pentylene glycol diacrylate according to 0.02% and 0.04% of the solid content of the positive electrode and negative electrode slurries, and add them to the positive electrode and negative electrode slurries respectively. After stirring evenly, the pole piece is prepared according to the pole piece production process of the liquid lithium battery.

[0069] 3. Preparation of battery core:

[0070] According to the liquid lithium-ion battery process, the modified diaphragm i...

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Abstract

The invention discloses a novel polymer lithium battery and a relative preparation method. The invention modifies the baffle membrane of general liquid lithium battery, adds chemical crosslink agent monomer with high boiling point into anode slurry and cathode slurry used for preparing liquid lithium battery, fills liquid lithium battery electrolyte with thermal initiator, to process thermal solidification, to obtain a novel polymer lithium battery. The invention can use general production process and device of prior liquid lithium battery, with the support for batch production of polymer battery, while the novel battery has same electric property of liquid battery.

Description

technical field [0001] The invention relates to a polymer lithium ion battery and its preparation process, more specifically, the invention relates to a polymer lithium ion battery without an extraction process and its preparation process. Background technique [0002] Polymer lithium ion battery is a new generation of high specific energy secondary battery system developed on the basis of liquid lithium ion battery. Compared with the traditional liquid lithium-ion battery, it has the following obvious advantages: (1) The polymer electrolyte is used instead of the liquid electrolyte solution, which can effectively avoid the electrolyte leakage problem that may exist in the liquid battery, and the reliability of the battery is higher; ( 2) Using lightweight soft plastic material as the shell, compared with liquid batteries using metal shells, on the one hand, it can effectively reduce the quality of the battery shell, improve the quality efficiency of the battery, and make th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/40H01M2/14H01M50/403H01M50/414H01M50/491
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 刘会冲廖钦林韩建国艾新平
Owner 广东风华新能源股份有限公司
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