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Preparation method of composite modified lithium metal soft package battery

A soft-pack battery and composite modification technology, which is applied in the manufacture of lithium batteries, electrolyte batteries, and battery electrodes, can solve problems such as complex chemical synthesis processes, chemical instability of lithium metal negative electrodes, and harsh environmental conditions, and achieve low control requirements , The modification method is simple and easy, and the effect of simple disassembly

Inactive Publication Date: 2021-01-01
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the chemical instability of lithium metal anodes, these methods all require complex chemical synthesis processes and harsh environmental conditions.

Method used

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  • Preparation method of composite modified lithium metal soft package battery
  • Preparation method of composite modified lithium metal soft package battery
  • Preparation method of composite modified lithium metal soft package battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A preparation method for a composite modified lithium metal pouch battery, comprising the steps of:

[0040] 1) Making the positive electrode sheet: Disperse 67.06g of high-nickel ternary positive electrode material, 2g of superconducting carbon black, and 0.84g of PVDF in 39.2g of N-methylpyrrolidone, stir evenly, and coat on the positive electrode aluminum foil current collector. After drying at ℃, roll into sheets and cut; weld the cut positive electrode sheet and aluminum lug together, and fix it with insulating tape;

[0041] 2) Bake the positive electrode sheet: Put the obtained positive electrode sheet in a vacuum oven to dry, bake at 90°C for 24 hours, and continue vacuuming to control the moisture content of the positive electrode sheet to ≤200ppm;

[0042] 3) To make the negative electrode sheet: spread the microporous copper foil with a pore size of 25 μm and a thickness of 9 μm on both sides of the lithium strip, and weld the nickel tab to one end of the mic...

Embodiment 2

[0053] A preparation method for a composite modified lithium metal pouch battery, comprising the steps of:

[0054] 1) Making the positive electrode sheet: Disperse 80g of high-nickel ternary positive electrode material, 2g of superconducting carbon black, and 2g of PVDF in 42g of N-methylpyrrolidone, stir evenly, and coat it on the positive electrode aluminum foil current collector, and dry it at 80°C , rolled into sheets, and cut; weld the cut positive electrode sheet and aluminum lug together, and fix it with insulating tape;

[0055] 2) Bake the positive electrode sheet: Put the obtained positive electrode sheet in a vacuum oven to dry, bake at 90°C for 24 hours, and continue vacuuming to control the moisture content of the positive electrode sheet to ≤200ppm;

[0056] 3) To make the negative electrode sheet: spread the microporous copper foil with a pore size of 10 μm and a thickness of 5 μm on both sides of the lithium strip, and weld the nickel tab to one end of the mic...

Embodiment 3

[0062] On the basis of Example 1, the carbon-coated separator is a PET film coated with nanoscale carbon powder.

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a preparation method of a composite modified lithium metal soft package battery, which comprises the following steps: in the assembly process of the soft package lithium battery, placing microporous copper foils between a metal lithium alloy negative electrode and a diaphragm, and placing the metal lithium alloy negative electrode in two microporous copper foils; the two microporous copper foils being jointly connected to the nickel tab, the microporous copper foils forming a physical protection effect on the lithium metal negative electrode, and arranging the positive plate on the other side of the diaphragm; and inhibiting the growth of lithium metal dendrites by adopting the carbon-coated diaphragm. Themicroporous copper foil modified metal lithium alloy negative electrode provided by the invention realizes good application in a lithium battery, the modification method is simple and easy to implement, the control requirement is low, mass production is easy, no special test environment or special device investment is needed, an original lithium battery production line and equipment can be utilized, a production system does not need to be modified, meanwhile, the electrochemical performance of the metal lithium alloy negative electrode can be improved, and the electrochemical cycling stabilityis improved.

Description

technical field [0001] The invention relates to the technical field of lithium metal batteries, in particular to a preparation method of a composite modified lithium metal pouch battery. Background technique [0002] Lithium metal anode is the "holy grail" of lithium battery technology. Since the birth of lithium batteries, people have been working on the development of lithium metal anodes with stable performance, safety and reliability. The high theoretical specific capacity of lithium metal anode (3860mAh g -1 ) and low density (0.59g·cm -3 ) makes it an ideal anode material for future lithium batteries, such as lithium-sulfur batteries and lithium-air batteries (Adv. Energy Mater., 2020, 2000804). However, there are problems such as difficult control of side reactions, internal short circuit caused by lithium dendrites, large volume change of metal lithium anode, and "dead lithium" in the metal lithium anode, which will lead to increased polarization of the battery and...

Claims

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Application Information

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IPC IPC(8): H01M4/80H01M4/66H01M10/052H01M10/058
CPCH01M4/661H01M4/80H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 史家远胡锦飞刘江涛王庆杰陈晓涛石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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