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Application of lithium vanadium phosphate in coating of lithium-sulfur battery diaphragm

A technology for lithium vanadium phosphate and lithium-sulfur battery is applied in the application field of lithium vanadium phosphate in the coating of lithium-sulfur battery separator, which can solve the problems of poor low temperature performance, poor ion diffusion ability, low material conductivity, etc. The effect of utilization

Active Publication Date: 2021-10-15
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes an application of lithium vanadium phosphate in the coating of lithium-sulfur battery diaphragm, and uses fast ion conductor lithium vanadium phosphate to solve the problems of low material conductivity, poor ion diffusion ability and low temperature in conventional lithium-sulfur battery diaphragm coating To overcome technical problems such as poor performance, and provide a preparation method suitable for modified separators for lithium-sulfur batteries

Method used

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  • Application of lithium vanadium phosphate in coating of lithium-sulfur battery diaphragm
  • Application of lithium vanadium phosphate in coating of lithium-sulfur battery diaphragm
  • Application of lithium vanadium phosphate in coating of lithium-sulfur battery diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The preparation method of lithium vanadium phosphate coating membrane material comprises steps as follows:

[0031] Step (1): Weigh 300 mg of lithium vanadium phosphate prepared by sol-gel method, mix it with conductive carbon (super p) and polyvinylidene fluoride (PVDF) according to the mass ratio of 80:10:10, add a certain amount dropwise A certain amount of N-methylpyrrolidone is used as a dispersant, and it is fully ground for 30 minutes;

[0032] Step (2): The slurry obtained in step (1) was evenly coated on the surface of the PP separator with a thickness of 20 μm by casting coating, the coating thickness was controlled at 5 μm, and the blade speed was 25 mm / s;

[0033] Step (3): Dry the coated separator obtained in step (2) in a constant temperature drying oven at 60° C. for 12 hours to obtain the separator coating material.

[0034] figure 1 SEM image of lithium vanadium phosphate prepared by sol-gel method; figure 2 The XRD figure of the lithium vanadium ...

Embodiment 2

[0040] The preparation method of lithium vanadium phosphate coating membrane material comprises steps as follows:

[0041]Step (1): Weigh 300 mg of lithium vanadium phosphate prepared by solid-phase ball milling, mix it with conductive carbon (super p) and polyvinylidene fluoride (PVDF) according to the mass ratio of 70:20:10, add a certain amount of A certain amount of N-methylpyrrolidone is used as a dispersant, and it is fully ground for 30 minutes;

[0042] Step (2): The slurry obtained in step (1) is uniformly coated on the surface of the PP separator with a thickness of 20 μm by casting coating, the coating thickness is controlled at 10 μm, and the speed of the scraper is 25mm / s;

[0043] Step (3): Dry the coated separator obtained in step (2) in a constant temperature drying oven at 60° C. for 12 hours to obtain the separator coating material.

[0044] Image 6 It is the rate performance diagram of the LVP coated separator prepared in Example 1 and Example 2 in the ba...

Embodiment 3

[0046] The preparation method of lithium vanadium phosphate coating membrane material comprises steps as follows:

[0047] Step (1): Weigh 300 mg of lithium vanadium phosphate prepared by sol microwave method, mix with conductive carbon (super p) and polyvinylidene fluoride (PVDF) according to the mass ratio of 75:15:8, and drop a certain amount N-methylpyrrolidone is used as a dispersant, and it is fully ground for 30 minutes;

[0048] Step (2): The slurry obtained in step (1) is uniformly coated on the surface of the PP separator with a thickness of 20 μm by casting coating, the coating thickness is controlled at 12 μm, and the speed of the scraper is 20mm / s;

[0049] Step (3): Dry the coated separator obtained in step (2) in a constant temperature drying oven at 60° C. for 12 hours to obtain the separator coating material.

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Abstract

The invention provides an application of lithium vanadium phosphate in coating of a lithium-sulfur battery diaphragm, a lithium vanadium phosphate material is used in a coating material of the lithium-sulfur battery diaphragm, the content of the lithium vanadium phosphate in the diaphragm is 5-15%, and the coating thickness is 5-20 microns. The method comprises the following steps: preparing a lithium vanadium phosphate material by adopting a sol-gel method, and then fully mixing the obtained material with conductive carbon and a binder; and by controlling the viscosity, enabling the mixed slurry to be adhered to the surface of the PP diaphragm, performing vacuum drying to obtain the required lithium vanadium phosphate coated PP diaphragm, and finally, applying the obtained diaphragm to the lithium-sulfur battery. The application is simple in process, low in cost, excellent in performance and suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to the application of lithium vanadium phosphate in the coating of lithium-sulfur battery diaphragms. Background technique [0002] At present, lithium-sulfur batteries, as one of the ideal candidate batteries in the post-lithium-ion battery era, have attracted extensive attention from researchers because of their high theoretical specific capacity of 1675mAh / g and huge energy density (2500 Wh / kg). . [0003] Although lithium-sulfur batteries have a series of advantages such as high energy density, low cost, green and pollution-free, so far, commercial lithium-sulfur batteries are still in the research and development stage, mainly due to the low conductivity of sulfur itself and the intermediate discharge of sulfur cathodes. Many products, the shuttle effect of sulfide and other factors are limited. Therefore, the key to improving the electrical performance of lithium-sulfur batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/46H01M4/13H01M10/052H01M50/403
CPCH01M50/46H01M4/13H01M10/052H01M50/403Y02E60/10
Inventor 王利霞闫继常鑫波赵太宝张林森
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY