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Diaphragm containing mixed conductor coating and preparation method and application thereof

A hybrid conductor and coating technology, applied in the field of materials, can solve the problems of insignificant improvement in the heat resistance of the separator, poor battery cycle performance, poor wettability and ionic conductivity, etc., to improve the interface compatibility and improve the cycle. Performance and safety performance, moisture reduction effect

Pending Publication Date: 2022-03-08
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ceramic separators are currently the most widely used lithium battery separators. However, the existing ceramic separators on the market have problems such as poor wettability and ionic conductivity, poor battery cycle performance, and no obvious improvement in the heat resistance of the separator. Therefore, a lithium battery separator with excellent performance is needed to meet the requirements of battery performance.

Method used

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  • Diaphragm containing mixed conductor coating and preparation method and application thereof
  • Diaphragm containing mixed conductor coating and preparation method and application thereof
  • Diaphragm containing mixed conductor coating and preparation method and application thereof

Examples

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preparation example Construction

[0053] The above separator containing the mixed conductor coating can be obtained by the following preparation method. The specific method steps are as figure 1 shown, including:

[0054] Step 110, according to the required mass parts, the new carbon-coated solid electrolyte material, dispersant and solvent are dispersed at a high speed in a stirring tank at a dispersion speed of 2000rmp-3000rmp;

[0055] Step 120, sanding the dispersed slurry, taking it out after sanding, adding binder, wetting agent and auxiliary agent according to the required mass fraction, fully stirring and ultrasonic treatment, to obtain coating slurry;

[0056] In step 130, the coating slurry is evenly coated on at least one surface of the base membrane and dried to obtain a separator with a novel carbon-coated solid electrolyte material coating.

[0057] Specifically, the coating method includes any one of a doctor blade coating method, a gravure roll coating method, and a spray coating method.

[...

Embodiment 1

[0062] This embodiment provides a method for preparing a diaphragm with a mixed conductor coating.

[0063] Add 40g of polyethylene glycol, 20g of sodium carboxymethylcellulose and 8kg of deionized water into the pre-stirring tank, and disperse at a dispersion speed of 3000rpm for 1 hour to obtain the first slurry.

[0064] 1800g of the new carbon-coated solid electrolyte material Li 2 al 0.5 Zr 1.5 Si 0.5 P 2.5 o 12 / C-C (the ratio is 1:0.55:0.05) is added to the first slurry, dispersed at a dispersion speed of 2500rpm for 1.5 hours, and the dispersed slurry is put into a sand mill for sand grinding, and the sand grinding time is 0.5 hours to obtain the second Two slurry.

[0065] 200 g of styrene-butadiene rubber and 20 g of polyether-modified siloxane were added to the second slurry for thorough stirring to obtain a third slurry; wherein, the stirring speed was 30 rpm.

[0066] Ultrasonic treatment was performed on the third slurry for 0.5 hour at an ultrasonic frequ...

Embodiment 2

[0072] This embodiment provides a method for preparing a diaphragm with a mixed conductor coating.

[0073] 1900g of the new carbon-coated solid electrolyte material Li 2 Ga 0.5 Zr 1.5 Si 0.5 P 2.5 o 12 / C-C (ratio 1:0.4:0.03), 20g of sodium dodecylbenzenesulfonate, 20g of sodium hexametaphosphate, 200g of polyvinyl alcohol, 20g of polydimethylsiloxane and 8kg of deionized water Add it into a stirring tank, disperse and stir for 3 hours at 2500rmp.

[0074] Sand the dispersed slurry first, take it out, and then perform ultrasonic treatment. The process parameters are the same as in Example 1, and a slurry with a new carbon-coated solid electrolyte material is obtained.

[0075] The above-mentioned slurry with the new carbon-coated solid electrolyte material was uniformly coated on the inner and outer surfaces of the 9 μm polyethylene microporous membrane with an anilox roll and dried to obtain a double-sided coating with the new carbon-coated solid electrolyte material c...

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Abstract

The invention relates to a diaphragm containing a mixed conductor coating as well as a preparation method and application thereof, and the diaphragm containing the mixed conductor coating comprises a base film and a coating attached to at least one side surface of the base film, the coating comprises a novel carbon-coated solid electrolyte material; the novel carbon-coated solid electrolyte material is of a core-shell structure, and the core-shell structure comprises an inner core and an outer shell; the inner core comprises a first component and a second component; the first component is specifically a solid electrolyte material, the chemical general formula is LixAyZr2-ySix-y-1P4-x + yO12, x is greater than or equal to 1 and less than or equal to 5, and y is greater than 0 and less than or equal to 1; wherein A comprises one or more of Al, Cr, Fe, Ga, Se, Y, In or La; the second component specifically comprises amorphous carbon and / or crystalline carbon; the shell is a carbon layer.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a diaphragm containing a mixed conductor coating and a preparation method and application thereof. Background technique [0002] At present, as a new type of secondary battery, lithium battery has the advantages of high energy density and long cycle life. Its application range is continuously expanding, and it has been widely used in power vehicles, energy storage and portable appliances. However, frequent lithium battery safety accidents have attracted widespread attention, and people have higher and higher performance requirements for lithium-ion batteries, not only requiring lithium batteries to have higher capacity and better capacity retention, but more It has higher security. Among them, the diaphragm, as an important part of the lithium battery, can effectively prevent the short circuit of the positive and negative electrodes, which has a very important impact on the sa...

Claims

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Application Information

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IPC IPC(8): H01M50/449H01M50/431H01M50/403H01M10/0525
CPCH01M50/449H01M50/431H01M50/403H01M10/0525Y02E60/10
Inventor 史晶石永明罗飞杨谦
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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