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Method for preparing lithium ion battery

A lithium-ion battery and negative electrode technology, applied in the field of lithium-ion battery preparation, can solve the problems of battery electrochemical performance limitation, asynchronous processing, affecting battery performance, etc., so as to improve battery performance effect, reduce interface resistance, and shorten production time Effect

Inactive Publication Date: 2019-07-02
ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is cumbersome to assemble the battery, especially in the assembly process, it is necessary to achieve the alignment and good contact between the electrode sheet and the separator, to avoid the internal short circuit caused by the burr in the die-cutting process, the degree of automation is limited, and the cost is high; the traditional technology is different Process requirements restrict each other, resulting in poor battery consistency
In addition, due to the complex interface structure between the positive / negative electrode sheet and the separator, the internal resistance of the battery is relatively large, which limits the electrochemical performance of the battery. Processing, there are constraints of asynchronous processing, which affects battery performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]The preparation of positive electrode slurry in this embodiment is prepared according to the mass ratio of nickel-cobalt-manganese ternary material: Super-P: carbon nanotubes: PVDF: NMP=96:1.5:1:1.5:54; negative electrode slurry preparation The mass ratio is graphite: Super-P: carbon nanotube: PVDF: NMP = 95:2:1:2:72. The ratio of the reversible capacity of the positive electrode to the reversible capacity of the negative electrode is 1:1.17. Stir the above-mentioned positive electrode slurry and negative electrode slurry separately and transfer them to the two syringes of the synchronous electrospinning device, and perform synchronous electrospinning treatment on the two opposite sides of the diaphragm, wherein the diaphragm adopts one side A double-layer PP / PE film coated with nano-ceramic material, the positive electrode slurry is coated on the surface of the separator on one side of the nano-ceramic material, and at the same time, the negative electrode slurry is coa...

Embodiment 2

[0028] The preparation of positive electrode slurry in this embodiment is prepared according to the mass ratio of nickel-cobalt-manganese ternary material: Super-P: carbon nanotubes: PVDF: NMP=96:1.5:1:1.5:54; negative electrode slurry preparation The mass ratio is graphite: Super-P: carbon nanotube: PVDF: NMP = 95:2:1:2:72. The ratio of the reversible capacity of the positive electrode to the reversible capacity of the negative electrode is 1:1.2. Stir the above-mentioned positive electrode slurry and negative electrode slurry separately and transfer them to the two syringes of the synchronous electrospinning device, and perform synchronous electrospinning treatment on the two opposite sides of the diaphragm, wherein the diaphragm adopts one side Coating the PP film with nano-ceramic material, coating the positive electrode slurry on the surface of the PP membrane diaphragm on one side of the nano-ceramic material, and at the same time, coating the negative electrode slurry o...

Embodiment 3

[0030] The preparation of positive electrode slurry in this embodiment is prepared according to the mass ratio of nickel-cobalt-manganese ternary material: Super-P: carbon nanotubes: PVDF: NMP=96:1.5:1:1.5:54; negative electrode slurry preparation The mass ratio is graphite: Super-P: carbon nanotube: PVDF: NMP = 95:2:1:2:72. The ratio of the reversible capacity of the positive electrode to the reversible capacity of the negative electrode is 1:1.3. Stir the above-mentioned positive electrode slurry and negative electrode slurry separately and transfer them to the two syringes of the synchronous electrospinning device, and perform synchronous electrospinning treatment on the two opposite sides of the diaphragm, wherein the diaphragm adopts one side Coating the PP film with nano-ceramic material, coating the positive electrode slurry on the surface of the PP membrane diaphragm on one side of the nano-ceramic material, and at the same time, coating the negative electrode slurry o...

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Abstract

The invention relates to a method for preparing a lithium ion battery, and belongs to the technical field of batteries. In order to solve the poor synchronism and the large internal resistance of an existing battery, a method for preparing the lithium ion battery is provided, which comprises steps of transferring the positive electrode paste and the negative electrode paste to a positive syringe and a negative syringe respectively; coating the two opposite sides of a diaphragm with the positive electrode paste and the negative electrode paste respectively by electrospinning; after drying, forming a positive active layer and a negative active layer on the two opposite sides of the diaphragm respectively; hot-rolling a positive electrode current collector and a negative electrode current collector onto the surfaces of the positive active layer and the negative active layer respectively; and obtaining the corresponding lithium ion battery by die cutting and subsequent processing. The method can reduce the internal resistance of the battery, improves the chemical performance of the battery, has a simple process and is easy to operate.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery, which belongs to the technical field of batteries. Background technique [0002] Lithium-ion battery is a new type of green chemical power source. Compared with traditional nickel-cadmium batteries and nickel-hydrogen batteries, it has the advantages of high voltage, long life, and high energy density. Since Japan's Sony Corporation launched the first generation of lithium-ion batteries in 1990, it has developed rapidly and is widely used in various portable devices, involving 3C products, power devices, energy storage equipment and other fields. Due to the vigorous development of new energy vehicles, the demand for power batteries is increasing, and at the same time, higher requirements are placed on their energy and rate performance. High-energy and high-power lithium batteries have become a key research direction in the battery industry. [0003] A complete lithium-ion battery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M2/14H01M10/0525H01M10/058D01D5/00
CPCD01D5/0069D01D5/0084D01D5/0092H01M4/0402H01M10/0525H01M10/058H01M50/403Y02E60/10Y02P70/50
Inventor 赵亚张芳芳刘桐桐杨冬生翟博刘俊军
Owner ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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