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Preparing method used for flow microsphere zinc electrode of secondary zinc battery

A secondary battery and zinc electrode technology, which is applied in the field of liquid flow microsphere zinc electrode preparation, can solve the problems of battery performance degradation, active material falling off, zinc electrode deformation, etc., and achieve the effect of increasing the area and avoiding deformation of zinc

Inactive Publication Date: 2012-08-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a zinc dichloride that can effectively avoid the generation of zinc dendrites for zinc-bromine redox flow batteries, aiming at the problem that the deformation of the zinc electrode of the zinc-bromine flow battery, the generation of dendrites, and the shedding of the active material caused by the battery performance decrease. Preparation method of liquid flow microsphere zinc electrode for secondary battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Monodisperse polystyrene microspheres were prepared by dispersion polymerization, and the surface of polystyrene microspheres was modified with concentrated sulfuric acid. The modified polystyrene microspheres were used as templates for preparing polyaniline microspheres. Under the condition of doping with a certain concentration of HCl, aniline monomers were polymerized on the surface of polystyrene templates, and then the polystyrene templates were passed through N,N- Dimethylformamide (DM F) was dissolved to obtain polyaniline hollow microspheres with a particle size of 20-350 μm.

[0020] The electroplating method is used to coat the surface of the polymer (polyaniline) microsphere with a uniform thickness of zinc coating. Specifically: the polyaniline microspheres are placed in the cathode area of ​​the electrolytic cell, electroplated, and continuously stirred to obtain microspheres with uniform coating. Controlling the electroplating time can obtain galvanized m...

Embodiment 2

[0023] Using ammonium persulfate as oxidant and dopant, conductive polymethylamine microspheres were prepared by self-assembly method. The average diameter of the microspheres was about 200 μm. The prepared hollow polymer microspheres are placed in the cathode area of ​​the electrolytic cell, and the microspheres with uniform coating are obtained by electroplating. Controlling the electroplating time can obtain galvanized microspheres with moderate coating thickness, and the product density is controlled at 2.65g / cm 3 about. The optimal conditions for microsphere galvanizing are ZnO 18g / L, NaOH 90g / L, and cathode current density 4.0A / dm 2 , temperature 30°C.

[0024] Zinc-coated polymer microspheres, 5mol / L ZnBr 2 , 0.5mol / L ZnCl 2, 1mol / L quaternary ammonium salt together to form a suspension, and adjust the pH value to 4.0 with HBr to prepare a liquid flow zinc electrode. A 0.6 mm thick polyethylene film is used as the separator for the positive and negative electrodes. ...

Embodiment 3

[0026] First, monodisperse polystyrene microspheres were prepared by dispersion polymerization, and then immersed in 40 mL of 30% H 2 o 2 with 160 mL of 98% H 2 SO 4 Coarse in the mixed solution for 5min, rinse, then immerse in 1% acetic acid solution containing 1% chitosan for 5min, dry at 60°C for 30min to obtain chitosan-wrapped polystyrene microspheres, then, at 40°C Microspheres immersed in 0.2g / L PdCl 2 Mix with 2g / L HCl for 5min, rinse, and reduce with sodium hypophosphite for 2min to obtain Pd-coated chitosan-polystyrene microspheres. Finally, at 40°C, use sodium citrate as a complexing agent, Sodium is the reducing agent, and after immersing the Pd-plated chitosan-polystyrene microspheres in the electroless nickel plating solution for 20 minutes, a dense and continuous Ni coating with strong adhesion to the substrate can be formed to obtain a conductive layer.

[0027] The nickel-plated hollow polymer microspheres are placed in the cathode area of ​​the electrolyt...

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Abstract

The invention discloses a preparing method used for a flow microsphere zinc electrode of a secondary zinc battery. Zinc-plated conducting microspheres are highly distributed in flow electrolyte consisting of zinc salt solution of zinc bromide and zinc chloride, quaternary ammonium salt and hydrobromic acid solution, and the zinc-plated conducting microspheres and a three-dimensional mesh current-collection body commonly constitute the flowable microsphere zinc electrode, wherein the zinc-plated conducting microspheres are prepared by the following steps that: 50-200mum-diameter conducting microspheres are placed in a cathode region of an electrolytic tank to be electroplated and are stirred at the same time so that plating layers of the microspheres are uniform, the microspheres with the moderate thickness of the plating layers can be obtained through time control, zinc-plated solution consists of Zn<2+> with the concentration being 3-25g / L and NaOH with the concentration being 15-180g / L, the cathode-current density is 0.5-4.0A / dm<2>, and the temperature is 10-40 DEG C. According to the preparing method, the deformation and the pine-tree crystal of a solid zinc polar plate in the charging and discharging processes of the zinc electrode and the dropping of active substances caused by the deformation and the pine-tree crystal can be effectively avoided, thereby improving the performance of the zinc electrode of the zinc battery obviously and realizing large-current charging and discharging.

Description

technical field [0001] The invention relates to a zinc secondary battery, in particular to a preparation method of a liquid flow microsphere zinc electrode used in a zinc-bromine battery. Background technique [0002] Zinc-bromine flow battery is a new generation of high-energy battery that was researched abroad in the late 1970s and early 1980s. The zinc-bromine flow battery uses zinc bromide as the electrolyte and graphite as the electrode. Its energy is mainly stored in the electrolyte, which changes the traditional energy storage method. The appearance of the zinc-bromine battery is a major breakthrough in chemical power sources. Zinc-bromine flow battery has the advantages of low cost, long battery life (more than 1000 cycles), high energy density (the specific energy of zinc-bromine battery is as high as 435Wh / kg, and the actual specific energy can reach 85Wh / kg), electrical performance characteristics Good (overcharge and 100% discharge will not damage the battery) a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/26
CPCY02E60/10
Inventor 司士辉石君蓝赵永福李建文
Owner CENT SOUTH UNIV
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