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A kind of lithium metal battery separator modified slurry and its application

A technology for lithium metal batteries and modified slurry, which is applied in the direction of lithium batteries, secondary batteries, battery components, etc., can solve the problems of difficult commercialization of lithium metal batteries, volume expansion, and uncontrollable growth of lithium dendrites. Achieve better lithium affinity and mechanical properties, improve cycle life, and reduce raw material costs

Active Publication Date: 2021-10-26
北京中瑞泰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, lithium metal electrodes have problems such as serious volume expansion and uncontrollable lithium dendrite growth during the battery cycle, which has become a bottleneck for the commercialization of lithium metal batteries.

Method used

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  • A kind of lithium metal battery separator modified slurry and its application
  • A kind of lithium metal battery separator modified slurry and its application
  • A kind of lithium metal battery separator modified slurry and its application

Examples

Experimental program
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Embodiment 1

[0046] The embodiment of the present invention provides a dispersion of fluorinated graphite nanosheets, the preparation method of which is as follows:

[0047]Take 1g of fluorinated graphite and add it to 80mL of N-methylpyrrolidone, then raise the temperature to 80°C in a water bath, keep stirring for 3-7h; then, take out the mixed solution and cool it to room temperature, and then place the mixed solution in ultrasonic Sonicate in the machine at room temperature for 30 hours to obtain the mother liquor, and then centrifuge the mother liquor in a centrifuge at a speed of 3000 rpm for 30 minutes; finally, place the centrifuged solution in a dark place for 14-18 days, and take the upper layer solution.

Embodiment 2

[0049] The embodiment of the present invention provides a fluorinated graphite nanosheet / polyvinylidene fluoride modified diaphragm, the preparation method of which is as follows:

[0050] S1. Preparation of modified slurry for lithium metal battery diaphragm, specifically comprising, weighing 50 mg of polyvinylidene fluoride powder, adding it to 1 mL of the fluorinated graphite nanosheet dispersion prepared in Example 1, and fully stirring until the slurry is transparent Polyvinylidene fluoride powder, you can;

[0051] S2. Apply the lithium metal battery separator modified slurry prepared in step S1 evenly on the surface of the polypropylene separator, then place it in a vacuum drying oven, dry it in vacuum at 60° C. for 12 hours, and take it out after cooling for later use.

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Abstract

The invention discloses a lithium metal battery diaphragm modified slurry and an application thereof. The modified slurry is prepared from a fluorinated graphite nanosheet dispersion liquid and a polymer substrate, and the polymer substrate and fluorinated graphite nanosheet The weight-to-volume ratio of the dispersion is 30-70mg: 1ml, and the concentration of the fluorinated graphite nanosheet dispersion is 1-2mg / ml; in addition, the modified slurry is evenly coated on one side of a commercial separator, and dried in vacuum, that is A modified diaphragm for a lithium metal battery can be obtained. In the present invention, when the lithium metal battery modified diaphragm is applied to the lithium metal battery assembly, a layer of fluorinated graphite / polyvinylidene fluoride protective layer can be formed in situ on the surface of the lithium metal electrode, which is beneficial to inhibit the growth of lithium dendrites and effectively The stable lithium metal negative electrode has better lithium affinity and mechanical properties, lower interface resistance, and can improve the cycle life of lithium metal batteries. It is simple to prepare and is suitable for large-scale production of lithium metal battery separators.

Description

technical field [0001] The invention belongs to the technical field of lithium metal battery manufacturing, and in particular relates to a lithium metal battery diaphragm modification slurry and an application thereof. Background technique [0002] With the continuous development of electronic equipment, people put forward higher and higher requirements for the energy density, power density and cycle life of rechargeable batteries. At the same time, the update speed of lithium-ion battery technology based on the principle of lithium-ion topological intercalation has gradually lagged behind social development. How to further improve the performance indicators of rechargeable batteries is of great significance to human production and life. Among many anode materials for rechargeable batteries, lithium metal has attracted extensive attention from researchers due to its low electrochemical potential and low density. [0003] However, lithium metal electrodes suffer from severe ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/411H01M50/446H01M50/417H01M10/052H01M10/42H01M50/449H01M50/451
CPCH01M10/052H01M10/4235H01M50/403H01M50/431H01M50/411Y02E60/10
Inventor 宫勇吉肖京翟朋博
Owner 北京中瑞泰新材料有限公司
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