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Application of polyporous material in sodium polysulfide/bromine accumulation energy power cell electric pole

A porous material, sodium polysulfide technology, applied in battery electrodes, regenerative fuel cells, electrode manufacturing, etc., can solve the problems of low redox reaction activity, reduce electrochemical polarization of electrode reactions, etc., to speed up the commercialization process, reduce Battery cost, easy adjustment effect

Inactive Publication Date: 2007-09-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

carbon material to Br - / Br 2 The oxidation-reduction reaction catalytic activity is higher, but for S 2- x / S 2- x+1 The redox reaction activity is low, so surface modification of carbon-based electrodes is necessary to reduce the electrochemical polarization of electrode reactions

Method used

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  • Application of polyporous material in sodium polysulfide/bromine accumulation energy power cell electric pole
  • Application of polyporous material in sodium polysulfide/bromine accumulation energy power cell electric pole
  • Application of polyporous material in sodium polysulfide/bromine accumulation energy power cell electric pole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Cut the nickel foam into small pieces of 20×30×3.19mm as the negative electrode material of the battery, use polyacrylonitrile carbon felt (20×30×3.19mm) as the positive electrode material, and boil the positive electrode material in 1mol / l NaOH solution before use 40 minutes to make it hydrophilic.

[0052] The prepared electrode area is 600mm 2 , thickness 3.19mm.

[0053] Nafion-117 membrane is selected as the cation exchange membrane. Before use, the membrane needs to be heated in a 353K water bath with 1.0mol / l NaOH solution for about 2 hours, and then washed with deionized water for pretreatment to convert the hydrogen form of the membrane into sodium Type membrane, and remove organic and inorganic impurities in the membrane.

[0054] Assemble the battery according to Figure 1, and test the performance of the battery on a single-cell evaluation device. See Figure 2 for the relationship between voltage and time during battery and single-electrode constant curren...

Embodiment 2

[0058] The graphite felt and the carbon felt were cut into 20×30×3.19 mm in size, and boiled in 1 mol / l NaOH solution for 40 minutes before use to make them hydrophilic. Carbon felt is used as the positive electrode material of the battery, and the graphite felt of the negative electrode is subjected to chemical deposition of nickel on the surface. The process steps are as follows: polyacrylonitrile graphite felt→roughening→water washing→presoaking→activation→water washing→degelling→water washing→electroless plating→water washing.

[0059] Formula and operating conditions:

[0060] Coarsening: 50% HNO 3 Solution, room temperature, time: 10-20 minutes

[0061] Pre-dipping: stannous chloride: 30-50g / l, hydrochloric acid (36-38% by weight): 100ml / l, room temperature, time: 1-3 minutes

[0062] Activation: colloidal palladium activation solution, room temperature, time: 5-10 minutes

[0063] Degumming: industrial hydrochloric acid (36-38%): 100ml / l, temperature: 45°C, time: 3-5...

Embodiment 3

[0072] Change negative electrode graphite felt into carbon felt in embodiment 2, and its processing method is unchanged.

[0073] Select Nafion-117 membrane as the cation exchange membrane, and its treatment method is the same as that in Example 1.

[0074] A battery was assembled according to Figure 1, and the performance of the battery was tested on a single-cell evaluation device, and the operating conditions were the same as in Example 1. The initial negative electrode electrolyte is 1.3mol / l Na 2 S 4 Solution 50ml, positive electrode electrolyte is 4.0mol / l NaBr solution 50ml, at constant flow 0.04A / cm 2 After charging for 5.58 hours, the polarization curve and energy density curve during charging and discharging of the battery are shown in Figure 5. It can be seen from the figure that when the battery is at 0.04A / cm 2 When working under high conditions, the energy density of the battery is 53.96mW / cm 2 , while 0.05A / cm 2 The energy density reaches 65.4mW / cm at the c...

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Abstract

The invention relates to chemical power source energy storage cell, specially an application of porous material in sodium polysulfide / bromine energy storage cell electrode, said porous material is as the cathode of cell to applied in sodium polysulfide / bromine energy storage cell, said porous material is foam type, agglomeration type or fibre type transition metal, or carbonyl or graphite-base fabric felt of electrodeposition or chemical deposition transition metal. The anode adopts the carbonyl felt or graphite-base felt without activator. The electrode produced possesse higher conductivity, better mechanical intensity, and perfect active, chemical and electrochemical stability in sodium polysulfide / bromine energy storage cell. The cell assembled by the electrode possesses higher energy efficiency and longer circle life. The invention possesses higher practicality value, and easy to be produced in batch, the cost of energy storage cell can be decreased, and it fits for quickening the commercialization course of sodium polysulfide / bromine energy storage cell.

Description

technical field [0001] The invention relates to a chemical power storage battery, in particular to the application of a porous material in the electrode of a sodium polysulfide / bromine energy storage battery, the electrodes used are transition metal-based porous electrodes and surface-modified carbon-based porous electrodes . Background technique [0002] The storage of electric energy is of great significance in the aspects of power system peak shaving and valley filling, prevention of power supply disasters, military applications, solar energy, wind energy and other renewable energy storage. Therefore, it is necessary to develop a low-cost, environment-friendly, and commercializable high-efficiency energy storage technology. Chemical power storage technology has been applied in practice because it is not limited by geographical location and time. The traditional chemical energy storage power supply uses lead-acid batteries, but the battery life is short, generally 3-5 ye...

Claims

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Application Information

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IPC IPC(8): H01M4/96H01M4/36H01M4/66H01M4/04H01M4/88H01M8/18H01M10/36
CPCY02E60/528Y02E60/10Y02E60/50Y02P70/50
Inventor 张华民赵平周汉涛高素军衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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