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 batt

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

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0053] The diaphragm of the above mixed conductor coating can be obtained by the following method. Specific method steps figure 1 As shown, including:

[0054] Step 110, in accordance with the required mass fraction, a new carbon coated solid electrolyte material, a dispersant, and a solvent are distracted at 2000 RMP-3000RMP dispersion velocity at a high speed of 2000 rmp-3000 rmp;

[0055] Step 120, the dispersed slurry is sandwicked, and after the sand is taken out, the binder, the wetting agent, and the aid are fully stirred and ultrasonic treatment, resulting in a coating slurry;

[0056] Step 130, uniformly coated the coating slurry on at least one surface of the base film and dried to obtain a diaphragm having a novel carbon coated solid electrolyte material coating.

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

[0058] In the above method steps, the selection and mass fraction of each co...

Example Embodiment

[0061] Example 1

[0062] This embodiment provides a method of preparation of a diaphragm containing a mixed conductor coating.

[0063] 40 g of polyethylene glycol, 20 g of carboxymethylcellulose and 8 kg deionized water were added to the pre-mix mix tank, and the first slurry was obtained at 1 hour at 3000 rpm dispersion velocity.

[0064] 1800g new carbon coated solid electrolyte material Li 2 Al 0.5 Zr 1.5 Si 0.5 P 2.5 O 12 The / CC (ratio is 1: 0.55: 0.05) Add the first slurry, dispersion of 2500 rpm is dispersed by 1.5 hours, and the dispersed slurry is added to the sand mill for sand grinding, and the grinding time is 0.5 hours to obtain the first Twilight.

[0065] 200 g of butyrene rubber and 20 g of polyether modified siloxane were sufficiently stirred in the second slurry to obtain a third slurry; wherein the stirring speed was 30 rpm.

[0066] Ultrasound treatment for the third slurry, the time is 0.5 hours, and the ultrasonic frequency is 5 kHz.

[0067] The ultrasoun...

Example Embodiment

[0071] Example 2

[0072] This embodiment provides a method of preparation of a diaphragm containing a mixed conductor coating.

[0073] 1000g new carbon coated solid electrolyte material Li 2 GA 0.5 Zr 1.5 Si 0.5 P 2.5 O 12 / Cc (ratio of 1: 0.4: 0.03), 20 g sodium dodecyl benzene sulfonate, 20 g of sodium hexaphyphosphate, 200 g of polyvinyl alcohol, 20 g of polydimethylsiloxane and 8 kg deionized water In the stirring tank, stirred at 2500 RMP for 3 hours.

[0074] The dispersed slurry is prior abrasive, and the ultrasound treatment is performed, and the process parameter is obtained in Example 1 to obtain a slurry having a novel carbon coated solid electrolyte material.

[0075] The slurry having the novel carbon clad solid electrolyte material is uniformly applied to the inside and outside of the 9 μm polyethylene microporous membrane and dried to obtain a two-sided coated solid electrolyte material coating. Diaphragm.

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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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