Composite negative plate of cerium and zinc redox flow cell and preparation method of plate

A flow battery and negative plate technology, applied in the field of electrochemical batteries, can solve the problems of easy dissolution of zinc flakes

Inactive Publication Date: 2013-08-21
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the zinc sheet of the negative plate of the existing cerium-zinc redo

Method used

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  • Composite negative plate of cerium and zinc redox flow cell and preparation method of plate

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preparation example Construction

[0024] The present invention also provides a method for preparing a composite negative plate of a cerium-zinc redox flow battery, comprising the following steps:

[0025] 1) According to the weight fraction, the binder, the activator and the additive are mixed to obtain the active layer slurry; the binder is polyvinylidene fluoride (PVDF) or polytetrafluoroethylene (PTFE), and the activator is The mixture of zinc powder and conductive material, the conductive material is preferably selected from one or more of activated carbon, graphene or acetylene black, more preferably activated carbon or acetylene black, zinc powder and conductive material in the activator The ratio of parts by weight is preferably (1-5): 1, more preferably (1.5-3): 1; the additive is one or more of indium oxide, tin oxide, bismuth oxide, titanium oxide or cerium oxide, The weight ratio of the binder, activator and additive is (5-15): (50-90): (5-50), preferably (5-10): (60-80): (20 ~40);

[0026] 2) Coa...

Embodiment 1

[0033] 1) Weigh 0.1g of binder polyvinylidene fluoride, 0.5g of zinc powder, 0.4g of activated carbon, 0.05g of acetylene black, 0.1g each of indium oxide, tin oxide and titanium oxide, add 2000ml of N-methylpyrrolidone and grind Dissolving to obtain the active layer slurry;

[0034] 2) Apply the above active layer slurry evenly on one side of the metal titanium plate by brushing to prepare the active layer. The coating amount of the active layer on the surface of the metal titanium plate is 140mg / cm 2 , the metal titanium plate coated with the active layer was vacuum-dried at high temperature, the drying temperature was 70°C, the drying time was 15h, and the relative vacuum degree was 1×10 -1 MPa, keeping the pressure and cooling down to room temperature to obtain a composite negative plate for a cerium-zinc redox flow battery. Such asfigure 1 shown.

[0035] The cerium-zinc redox flow battery composite negative plate obtained in Example 1 is combined with the positive grap...

Embodiment 2

[0037] 1) Weigh 0.08g of binder polyvinylidene fluoride, 0.6g of zinc powder, 0.15g of activated carbon, 0.05g of acetylene black, 0.1g each of tin oxide, bismuth oxide, titanium oxide and cerium oxide, and add 2000ml of N-formazan Grinding and dissolving base pyrrolidone to obtain active layer slurry;

[0038] 2) Apply the above active layer slurry evenly on one side of the metal titanium plate by scraping to prepare the active layer. The coating amount of the active layer on the surface of the metal titanium plate is 135mg / cm 2 , the metal titanium plate coated with the active layer was vacuum-dried, the drying temperature was 80°C, the drying time was 10h, and the relative vacuum degree was 1×10 -3 MPa, keeping the pressure and cooling down to room temperature to obtain a composite negative plate for a cerium-zinc redox flow battery.

[0039] The composite negative plate of the cerium-zinc redox flow battery obtained in Example 2 is combined with the positive graphite elec...

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Abstract

The invention provides a composite negative plate of a cerium and zinc redox flow cell and a preparation method of the plate, and belongs to the field of electrochemical cells. The composite negative plate comprises a metallic titanium plate and a surface active layer, wherein the surface active layer comprises a binding agent, an activating agent and an additive; polyvinylidene fluoride or polytetrafluoroethylene is used as the binding agent; the mixture of zinc powder and conducting material is used as the activating agent; and one or more of indium oxide, tin oxide, bismuth oxide, titanium oxide or cerium oxide is/are used as the additive; and the ratio of the binding agent to the activating agent to the additive is (5 to 15):(50 to 90):(5 to 50) in weight part. The invention also discloses a preparation method of the composite negative plate of the cerium and zinc redox flow cell. The cell assembled by the composite negative plate is subjected to charge-discharge testing through 100mA current, the number of cycles of the cell reaches more than 550, the average voltage efficiency of the cell is 88.4 percent, the average coulomb efficiency is 96.4 percent, and the average energy efficiency is 82.9 percent.

Description

technical field [0001] The invention belongs to the field of electrochemical batteries, and in particular relates to a composite negative plate of a cerium-zinc redox flow battery and a preparation method thereof. technical background [0002] In the research of cerium-zinc flow batteries, graphite, graphite felt or pure zinc are generally used as the negative electrode material of the battery. For example, in 2011, P.K.Leung et al. reported the research results on the cerium-zinc flow battery in Journal of Power Sources 196 (2011) 5174-5185. They used a carbon-polyethylene composite electrode as the negative electrode of the battery in the assembled battery and found that During the long-term operation of the battery, the pH in the negative electrode electrolyte will decrease, which will have a greater corrosion effect on the deposition of zinc on the negative electrode, and ultimately affect the capacity and cycle life of the battery. In 2011, Xie Zhipeng used pure zinc s...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 金荣荣王立民尹东明李存峰吴耀明程勇林静那兆霖袁冬霞徐圣楠
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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