Flexible lithium ion battery and preparation method thereof

A lithium-ion battery, flexible technology, applied in the direction of battery electrodes, secondary batteries, battery components, etc., can solve the problems of poor bending performance, low capacity of flexible lithium-ion batteries, etc., to relieve stress, improve electrochemical performance, Improved stability and security effects

Active Publication Date: 2020-09-18
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a flexible lithium-ion battery, which aims to solve the technical problems of low capacity and poor bending performance of the existing flexible lithium-ion battery

Method used

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  • Flexible lithium ion battery and preparation method thereof
  • Flexible lithium ion battery and preparation method thereof
  • Flexible lithium ion battery and preparation method thereof

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preparation example Construction

[0061] Accordingly, an embodiment of the present invention provides a method for preparing a flexible lithium-ion battery, including the following preparation steps:

[0062] S10. Obtain a positive electrode slurry comprising a positive electrode active material, a positive electrode binder, a positive electrode conductive agent, and a positive electrode solvent, deposit the positive electrode slurry on a substrate, and dry and separate to obtain a positive electrode film;

[0063] S20. Obtain a negative electrode slurry comprising a negative electrode active material, a negative electrode binder, a negative electrode conductive agent, and a negative electrode solvent, deposit the negative electrode slurry on a substrate, and dry and separate to obtain a negative electrode film;

[0064] S30. Laminating and pressing the multi-layer positive electrode film to obtain the positive electrode sheet;

[0065] S40. laminating and pressing the multi-layer negative electrode film to ob...

Embodiment 1

[0092] A kind of lithium iron phosphate (LFP) is active material and prepares multilayer LFP pole piece, and preparation method is as follows:

[0093] 1. Mix PVDF and NMP solution with a purity of 99.9% in a mass ratio of 8:92, and use magnetic stirring for 12 hours to fully stir to prepare an 8% PVDF solution;

[0094] 2. Weigh 1.54g of LFP powder and 0.14g of Super P respectively, grind them with a mortar for 0.5h after mixing, and then place them in a blast oven for 30min;

[0095] 3. Add the raw materials obtained in step (2), 0.5g LB117-NMP carbon nanotubes (solid content is 4%), 0.85g NMP solution with a purity of 99.9%, and 3.75g PVDF obtained in step (1) in the bottle at one time Solution, placed on a magnetic stirrer, the speed is 150r min -1 , the mixing time is 12h;

[0096] 4. Coat the slurry obtained in step (3) with a thickness of 400 μm on the front side of the aluminum foil, and then place it in a vacuum oven at 80° C. for 8 hours;

[0097] 5. Remove the po...

Embodiment 2

[0099] A kind of lithium cobaltate (LCO) is active material and prepares multi-layer LCO pole piece, and preparation method is as follows:

[0100] 1. Mix PVDF and NMP solution with a purity of 99.9% in a mass ratio of 8:92, and use magnetic stirring for 12 hours to fully stir to prepare an 8% PVDF solution;

[0101] 2. Weigh 1.66g of LCO powder and 0.14g of Super P respectively, grind them with a mortar for 0.5h after mixing, and then place them in a blast oven for 30min;

[0102] 3. Add the raw materials obtained in step (2), 0.5g of LB117-NMP carbon nanotubes, 0.5g of NMP solution with a purity of 99.9%, and 2.5g of the PVDF solution obtained in step (1) into the bottle, and place them on a magnetic stirrer , the speed is 120r min -1 , the mixing time is 12h;

[0103] 4. Coat the slurry obtained in step (3) with a thickness of 400 μm on the front side of the aluminum foil, and then place it in a vacuum oven at 80° C. for 8 hours;

[0104] 5. Remove the pole piece obtaine...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a flexible lithium ion battery which is characterized by comprising a positive plate, a diaphragm anda negative plate. The positive plate comprises multiple layers of positive films which are arranged in a laminated manner, the negative plate comprises multiple layers of negative films which are arranged in a laminated manner, and the components of the diaphragm, the binder in the positive films and the binder in the negative films are the same. According to the flexible lithium ion battery disclosed by the invention, the positive and negative pole pieces are arranged in a multi-layer stacking manner, so that the stress of the pole pieces in the deformation process can be effectively relieved, the phenomenon that the pole pieces are easy to break due to the fact that the deformation quantity of the outermost layer is greater than that of the inner layer in the deformation process of thesingle-layer structure pole pieces is avoided, and the stability and safety of the flexible battery are improved. According to the lithium ion battery, the diaphragm is made of a material the same asthe positive and negative electrode binders, and the positive plate, the negative plate and the diaphragm are tightly combined through affinity between the same substances, so that transmission of ions between different functional layers is facilitated, and the electrochemical performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a flexible lithium-ion battery and a preparation method thereof. Background technique [0002] In recent years, with the advancement of smart technology, a variety of flexible devices have become the main force in the electronics market, but the slow development of flexible batteries has seriously restricted the development and utilization of flexible consumer electronics. With the rapid development of wearable electronic devices and smart devices, there is an increasing demand for energy storage devices with high energy density, low manufacturing cost, and good flexibility. [0003] However, the current lithium-ion battery materials are not flexible, and the current collector is easily damaged during the bending process, and the poor contact of the particles of the electrode material during the bending process leads to contact resistance. At present, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M2/16H01M4/62H01M10/0525
CPCH01M10/0525H01M10/0585H01M4/622H01M4/623Y02E60/10Y02P70/50
Inventor 邓永红柯若弘韩兵
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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