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Lithium metal battery diaphragm modified slurry and application thereof

A technology of lithium metal battery and modified slurry, which is applied in the direction of lithium storage battery, secondary battery, battery pack components, etc., can solve the problems of volume expansion, difficult commercialization of lithium metal battery, uncontrollable growth of lithium dendrite, etc. To achieve the effect of improving cycle life, lithophilicity and mechanical properties, and cheap raw materials

Active Publication Date: 2020-08-21
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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  • Lithium metal battery diaphragm modified slurry and application thereof
  • Lithium metal battery diaphragm modified slurry and application thereof
  • Lithium metal battery diaphragm modified slurry and application thereof

Examples

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Effect test

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 lithium metal battery diaphragm modified slurry and application thereof. The modified slurry is prepared from a graphite fluoride nanosheet dispersion liquid and a polymer basematerial, wherein the weight-volume ratio of the polymer base material to the graphite fluoride nanosheet dispersion liquid is (30-70) mg:1 ml, the concentration of the graphite fluoride nanosheet dispersion liquid is 1-2 mg / ml, one surface of a commercial diaphragm is uniformly coated with the modified slurry, and vacuum drying is performed to obtain the lithium metal battery modified diaphragm.According to the invention, when the lithium metal battery modified diaphragm is applied to lithium metal battery assembly, a graphite fluoride / polyvinylidene fluoride protective layer can be formedon the surface of a lithium metal electrode in situ, so that the growth of lithium dendrites is inhibited, the lithium metal negative electrode is effectively stabilized, the lithium affinity and mechanical property are good, the interface resistance is low, and the cycle life of the lithium metal battery can be prolonged; and the preparation is simple, and the preparation method is suitable for large-scale production of lithium metal battery diaphragms.

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 Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M10/42H01M50/446H01M50/449H01M50/451
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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