Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of thick-film lithium battery and thick-film lithium battery

A lithium battery and thick film technology, which is applied in battery electrodes, electrolyte battery manufacturing, electrode manufacturing, etc., can solve the problems of low energy density and low safety performance, achieve good repeatability, improve safety performance, and reduce heat transfer speed Effect

Pending Publication Date: 2021-06-22
ZHEJIANG GODSEND POWER TECH
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] An object of the present invention is to provide a method for preparing a thick-film lithium battery in order to solve the defects of low energy density and low safety performance of existing lithium batteries. The thick-film lithium battery prepared by the present invention greatly improves the electron transmission speed to ensure The electrochemical performance of the electrode increases the loading capacity of the electrode several times, and reduces the ratio of positive and negative current collectors, which reduces the cost while further improving the energy density of the battery and improving the safety performance of the battery

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of thick-film lithium battery and thick-film lithium battery
  • Preparation method of thick-film lithium battery and thick-film lithium battery
  • Preparation method of thick-film lithium battery and thick-film lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a preparation method of a thick-film lithium battery and a thick-film lithium battery, and the preparation method is as follows:

[0047] Step S1: prepare oxalic acid solution, add 45g oxalic acid into 1000g water to fully dissolve, then soak the copper mesh and aluminum mesh in the above solution for 30 minutes, take them out and bake them in an oven at 80°C for 30 minutes.

[0048]Step S2: Prepare the positive electrode, according to the mass percentage, add 93.5% lithium iron phosphate, 3.5% polyvinylidene fluoride, and 3% conductive carbon black into the N-methylpyrrolidone solvent, stir evenly, and prepare the positive electrode slurry , wherein the solvent mass is 1.1 times the total mass of the dry powder. Apply the above positive electrode slurry evenly on both sides of the aluminum mesh with a pore size of 1.5*2.5mm, and the loading capacity is 60mg / cm on one side 2 , after drying treatment, the positive electrode is obtained, and afte...

Embodiment 2

[0054] This embodiment provides a preparation method of a thick-film lithium battery and a thick-film lithium battery, and the preparation method is as follows:

[0055] Step S1: prepare oxalic acid solution, add 45g oxalic acid into 1000g water to fully dissolve, then soak the copper mesh and aluminum mesh in the above solution for 30 minutes, take them out and bake them in an oven at 80°C for 30 minutes.

[0056] Step S2: Prepare the positive electrode, according to the mass percentage, add 93.5% lithium iron phosphate, 3.5% polyvinylidene fluoride, and 3% conductive carbon black into the N-methylpyrrolidone solvent, stir evenly, and prepare the positive electrode slurry , wherein the solvent mass is 1.1 times the total mass of the dry powder. Apply the above positive electrode slurry evenly on both sides of the aluminum mesh with a pore size of 1.5*2.5mm, and the loading capacity is 100mg / cm on one side 2 , after drying treatment, the positive electrode is obtained, and af...

Embodiment 3

[0062] This embodiment provides a preparation method of a thick-film lithium battery and a thick-film lithium battery, and the preparation method is as follows:

[0063] Step S1: Prepare the positive electrode, according to the mass percentage, add 93.5% lithium iron phosphate, 3.5% polyvinylidene fluoride, and 3% conductive carbon black into the N-methylpyrrolidone solvent, stir evenly, and prepare the positive electrode slurry , wherein the solvent mass is 1.1 times the total mass of the dry powder. Apply the above positive electrode slurry evenly on both sides of the aluminum mesh with a pore size of 1.5*2.5mm, and the loading capacity is 60mg / cm on one side 2 , after drying treatment, the positive electrode is obtained, and after rolling treatment, the compacted density is 2.3g / cm 3 .

[0064] Step S2: Prepare the negative electrode. According to the mass percentage, add 96% of artificial graphite, 2% of styrene-butadiene rubber emulsion, and 2% of conductive carbon blac...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Concentrationaaaaaaaaaa
Apertureaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a thick-film lithium battery and the prepared lithium ion battery. The preparation process of the lithium ion battery comprises the following steps: covering a current collector with positive and negative electrode materials in a coating manner, then carrying out rolling treatment, combining a diaphragm with the positive and negative electrodes into a complete battery cell in a winding or lamination manner, and packaging the battery cell to obtain the thick-film lithium battery. The positive and negative current collectors adopt a latticed structure, so that the electron transmission rate in the electrode is improved, the internal resistance of the battery is greatly reduced, and meanwhile, the overall cost of the battery is further reduced and the energy density is improved by adopting the high-coating-amount electrode. The preparation process is simple, the repeatability is good, and large-scale production can be realized.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a thick-film battery and a thick-film battery obtained therefrom. Background technique [0002] As a new generation of green high-energy battery system, lithium-ion batteries have the characteristics of high discharge platform, long cycle performance, and environmental friendliness. They are widely used in various digital products, electric vehicles and other fields. With the increasing commercial demand, the biggest bottleneck restricting lithium-ion batteries is the energy density. According to the "Medium and Long-term Development Plan of the Automobile Industry", the energy density of a single power battery is required to reach 300Wh / kg. At present, commercial lithium-ion batteries mainly include lithium iron phosphate batteries and ternary lithium batteries according to the positive electrode materials, and their energy dens...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/04H01M4/139H01M4/74H01M10/058H01M10/0587H01M10/0525H01M10/42
CPCH01M4/0404H01M4/0435H01M4/139H01M4/74H01M10/058H01M10/0587H01M10/0525H01M10/4235Y02P70/50Y02E60/10
Inventor 王宏杰张文魁叶张军周晓政孙建平方俊
Owner ZHEJIANG GODSEND POWER TECH