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Composite zinc cathode with inorganic functional modification layer in water system battery and preparation method thereof, and application of composite zinc cathode with inorganic functional modification layer in water system battery

A modified layer and zinc negative electrode technology, applied to composite zinc negative electrode and its preparation method and application field, can solve the problems of affecting battery safety performance and cycle stability, reducing cycle efficiency, battery short circuit, etc., achieving easy to enlarge application, specific surface area Great, improve the effect of battery life

Active Publication Date: 2019-10-22
浙江浙能中科储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, if metal zinc is directly used as the negative electrode, zinc dendrites will form on the surface of the electrode during the charging process. As the charge and discharge reactions continue, the cycle efficiency will be reduced, and even the separator will be pierced to cause a short circuit of the battery.
In addition, zinc corrosion will also occur. Metal zinc will react with water in the electrolyte to generate hydrogen gas, which will form flatulence to a certain extent, affecting the safety performance and cycle stability of the battery.

Method used

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  • Composite zinc cathode with inorganic functional modification layer in water system battery and preparation method thereof, and application of composite zinc cathode with inorganic functional modification layer in water system battery
  • Composite zinc cathode with inorganic functional modification layer in water system battery and preparation method thereof, and application of composite zinc cathode with inorganic functional modification layer in water system battery
  • Composite zinc cathode with inorganic functional modification layer in water system battery and preparation method thereof, and application of composite zinc cathode with inorganic functional modification layer in water system battery

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A 0.05 mg / μl polyvinylidene fluoride (PVDF) binder was prepared. Adding polyvinylidene fluoride (PVDF) into a methylpyrrolidone (NMP) solution for magnetic stirring for 10 hours to obtain a uniformly dispersed binder solution;

[0042] Weigh the alumina powder, acetylene black and polyvinylidene fluoride (PVDF) binder solution according to the mass percentage of 90:5:5, put it in a beaker, add a stirring magnet, place it on a magnetic stirrer and stir for 5 hours . The pretreatment of degreasing, decontaminating and deoxidizing the zinc foil is carried out, the zinc sheet is polished with sandpaper, then ultrasonicated, rinsed with deionized water and dried. Coat the uniformly mixed alumina slurry on the zinc foil with a thickness of 200 μm by doctor blade film-forming method, and dry it in an oven at 70°C to obtain a composite zinc negative electrode;

[0043] The full battery is assembled with lithium manganate as the positive electrode, polyethylene non-woven fabri...

Embodiment 2

[0047] A 0.05 mg / μl polyvinyl butyral (PVB) binder was prepared. Add polyvinyl butyral (PVB) into the alcohol solution for magnetic stirring, and the stirring time is 10 hours to obtain a uniformly dispersed binder solution;

[0048] Weigh the alumina powder, acetylene black and polyvinylidene fluoride (PVDF) binder solution according to the mass percentage ratio of 80:10:10, put it in a beaker, add a stirring magnet, place it on a magnetic stirrer and stir for 5 hours . The pretreatment of degreasing, decontaminating and deoxidizing the zinc foil is carried out, the zinc sheet is polished with sandpaper, then ultrasonicated, rinsed with deionized water and dried. Coat the uniformly mixed alumina slurry on zinc foil with a film-forming method of a doctor blade, with a thickness of 200 μm, and dry it in an oven at 70°C to obtain a composite negative electrode;

[0049] The full battery is assembled with lithium manganate as the positive electrode, polyethylene non-woven fabri...

Embodiment 3

[0053] A 0.02 mg / μl styrene-butadiene rubber (SBR) binder was prepared. Add styrene-butadiene rubber (SBR) into the toluene solution for magnetic stirring for 10 hours to obtain a uniformly dispersed binder solution;

[0054] The silica powder, graphite and styrene-butadiene rubber (SBR) binder solution were weighed according to the mass percentage ratio of 75:15:10 and placed in a beaker. After adding a stirring magnet, placed on a magnetic stirrer and stirred for 5 hours. The pretreatment of degreasing, decontaminating and deoxidizing the zinc foil is carried out, the zinc sheet is polished with sandpaper, then ultrasonicated, rinsed with deionized water and dried. Coat the uniformly mixed silicon oxide slurry on the zinc foil with a thickness of 200 μm by casting method, and put it into a 70°C oven to dry to obtain a composite negative electrode;

[0055] Figure 5 It is the constant current charge and discharge cycle life diagram of the manganese-based full battery assem...

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Abstract

The invention provides a composite zinc cathode with an inorganic functional modification layer in a water system battery and a preparation method thereof, and application of a composite zinc cathodewith an inorganic functional modification layer in a water system battery. The composite zinc cathode comprises a base layer and a modification layer located on the base layer; the material of the base layer is metal zinc or zinc alloy, and the material of the modification layer comprises ceramic powder and an electronic conductive material.

Description

technical field [0001] The invention relates to a composite zinc negative electrode with an inorganic functional modification layer and a preparation method and application thereof, belonging to the technical field of zinc batteries. Background technique [0002] With the development of economy, fossil energy is facing depletion, and the natural environment is deteriorating day by day. Energy storage technology can incorporate solar energy, wind energy and other indirect renewable resources into the smart grid to promote the utilization of new energy and ensure the stable operation of the power system. The aqueous ion energy storage battery proposed in recent years can take into account the three aspects of cost, safety and stability at the same time and has significant advantages, which is very suitable for application in the field of static large-scale electric energy storage. There are not many metals that can exist and maintain long-term stability in aqueous electrolysi...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/42H01M4/04H01M10/36
CPCH01M4/0404H01M4/42H01M4/624H01M4/628H01M10/36Y02E60/10
Inventor 刘宇杜月秀刘崇武李卓斌张娜
Owner 浙江浙能中科储能科技有限公司
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