Preparation method of flexible composite metal lithium film and lithium ion battery

A technology of composite metal and metal lithium, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of high safety, saving production and preparation costs, and good processing performance

Active Publication Date: 2021-09-03
浙江金羽新能源科技有限公司
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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 preparation method of flexible composite lithium metal film and lithium ion battery, by introducing flexible composite lithium metal film in lithium ion battery, to improve the performance of lithium ion battery, and solve existing lithium ion battery Risks when introducing lithium foil and lithium powder to improve battery performance

Method used

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  • Preparation method of flexible composite metal lithium film and lithium ion battery
  • Preparation method of flexible composite metal lithium film and lithium ion battery
  • Preparation method of flexible composite metal lithium film and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A flexible composite lithium metal film 4, comprising the following components:

[0051] Polyethylene 3%

[0052] Superconducting carbon black 12%

[0053] Lithium particles 85%

[0054] Mix the above-mentioned substances according to the above ratio, pass in argon gas, and stir for 25 minutes through the stirring rod, wherein the stirring rod rotates at 3000rpm, heat to 250°C, and keep at this temperature for 2 hours to obtain a fluid mixture in a molten state. Pass the fluid mixture through It is extruded by a twin-screw extruder, formed into a sheet film by a sheet head, and then rolled by a three-roll calender. Among them, the model of polyvinyl chloride is WS-1000S, and the rolling pressure is 350kg. The final flexible composite lithium metal film 4 has a thickness of 2 μm, a tensile strength of 100 mPa, and an elongation at break of 7%.

Embodiment 2

[0056] A flexible composite lithium metal film 4, comprising the following components:

[0057] PVC 5%

[0058] Carbon Fiber 5%

[0059] Lithium powder 90%

[0060] Mix the above-mentioned substances according to the above-mentioned ratio, pass in argon gas, and stir for 30 minutes through a stirring rod, wherein the stirring rod rotates at 2500 rpm, heat to 250°C, and keep at this temperature for 2 hours to obtain a fluid mixture in a molten state. Pass the fluid mixture through Extruded by a twin-screw extruder, formed into a sheet film by a sheet head, and then calendered and rolled by a three-roller calender. Among them, the model of polyethylene is HC7260, and the size of the lithium powder used is 20 μm. The pressing force was 300kg, and the roller distance was 5 μm. Finally, the flexible composite lithium metal film 4 was obtained with a thickness of 7 μm, a tensile strength of 137 mPa, and an elongation at break of 9%.

[0061] The flexible composite lithium metal f...

Embodiment 3

[0063] A flexible composite lithium metal film 4, comprising the following components:

[0064] Polyethylene terephthalate 9%

[0065] Superconducting carbon black 1%

[0066] Lithium particles 90%

[0067] Mix the above-mentioned substances according to the above ratio, pass in argon gas, and stir for 25 minutes through the stirring rod, wherein the stirring rod rotates at 3000rpm, heat to 250°C, and keep at this temperature for 2 hours to obtain a fluid mixture in a molten state. Pass the fluid mixture through Extruded by a twin-screw extruder, formed into a sheet film by a sheet head, and then rolled by a three-roller calender. The rolling pressure is 320kg, and the roll distance is 3μm. Finally, a flexible composite lithium metal film is obtained. 4 has a thickness of 4 μm, a tensile strength of 106 mPa, and an elongation at break of 8%.

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Abstract

The invention relates to a preparation method of a flexible composite metal lithium film and a lithium ion battery, and the flexible composite metal lithium film comprises the following components in percentage by weight: 3-30% of polymer, 1-30% of conductive agent and 40-96% of metal lithium and / or lithium alloy. Compared with a pure metal lithium foil, the flexible composite metal lithium film provided by the invention has the advantages that the preparation process is simple, the mechanical property is greatly improved, and the flexible composite metal lithium film has good processability. The invention also provides a lithium ion battery comprising the flexible composite metal lithium film, the first coulombic efficiency and cycle are obviously improved by introducing the flexible composite metal lithium film, the lithium ion battery has the characteristics of low cost, safety, high production efficiency and the like, and in the technological process of introducing the film, no extra introduction equipment is needed, the production and preparation cost is saved, the safety performance of the whole process is high, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of a flexible composite lithium metal film and a lithium ion battery. Background technique [0002] As a secondary battery, lithium-ion batteries rely on the transfer of lithium ions between the positive and negative electrodes to complete the charging and discharging work of the battery. With its advantages such as high discharge voltage, high energy density and long cycle life, it has gradually replaced lead in recent years. Traditional secondary batteries such as acid, nickel-cadmium, and nickel-metal hydride play a major role in small secondary batteries for electronic equipment. At the same time, they are widely used as power batteries in high-power and high-energy equipment such as electric bicycles and electric vehicles. With the continuous development of miniaturization and long standby time of portable electronic devices, and the continuous impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/40H01M4/62H01M10/0525B29C48/08B29C43/24
CPCH01M4/382H01M4/405H01M4/625H01M10/0525B29C48/0011B29C48/08B29C43/24Y02E60/10
Inventor 李爱军黄杜斌杨扬王春源邬金龙
Owner 浙江金羽新能源科技有限公司
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