Zinc-bromine single-flow battery

A technology of flow battery and zinc-bromine monolayer, which is applied in fuel cells, battery electrodes, regenerative fuel cells, etc., can solve the problems of complex structure, low content of active substances, affecting the charging capacity of batteries, etc., to achieve large space and improve charging capacity. Effect

Pending Publication Date: 2018-03-27

DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI

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AI-Extracted Technical Summary

Problems solved by technology

However, due to the pumpless design on both sides, the actual energy density of the battery is low, and it cannot be charged and discharged with a large current.

The patent introduces a zinc-bromine single-flow battery technology, which eliminates the positive electrode circulation pipeline, and the positive electrode uses a mixed paste of active materials, complexing ...

Method used

Battery structure of the present invention abandons the pasting step of original zinc-bromine single flow battery positive pole, adopts simple carbon felt or graphite felt as electrode, has guaranteed that positive pole has la...

Abstract

The invention relates to a zinc-bromine single-flow battery. The positive electrode of the battery is a porous material; a cavity is arranged between the positive electrode and a diaphragm; and poresin the porous material of the positive electrode or the cavity between the positive electrode and the diaphragm is filled with an electrolyte. During initial operation of the battery, the electrolyteis infused into the positive electrode via a pipeline provided with a valve. The battery provided by the invention has the characteristics of high energy density, long cycle life, low cost, and simplestructure and manufacturing process.

Application Domain

Cell electrodesRegenerative fuel cells

Technology Topic

BromineEnergy density +3

Image

Examples

Experimental program(3)
Comparison scheme(1)

Example Embodiment

[0033] Example 1

[0034] 1) The positive electrode uses a carbon felt of 4x4x0.5cm specifications, and the negative electrode uses a carbon felt of 4x4x0.5cm specifications

[0035] 2) Prepare 60ml of 2mol/L zinc bromide solution for use.

[0036] Battery assembly:

[0037] Such as figure 1 , The single cell includes a positive terminal plate, a positive electrode current collector, a positive electrode (carbon felt), a PE porous film, a negative electrode, a negative electrode current collector, and a negative electrode terminal plate in order.

[0038] The negative electrolyte input pipeline between the negative electrode and the circulation pump is provided with a branch pipeline as the positive electrolyte filling input pipeline, and the positive electrolyte filling input pipeline is connected with the porous material of the positive electrode or the cavity between the positive electrode and the diaphragm;

[0039] The negative electrolyte output pipeline is provided with a branch pipeline as the positive electrolyte irrigation output pipeline, and the positive electrolyte irrigation output pipeline is connected with the porous material of the positive electrode or the cavity between the positive electrode and the diaphragm;

[0040] Valves are provided on the positive electrolyte filling input pipeline and the positive electrolyte filling output pipeline.

[0041] The battery electrolyte circulation system is equipped with a positive electrolyte delivery pipeline. In the electrolyte delivery pipeline, the positive electrolyte inlet and outlet are equipped with valves to control the electrolyte delivery; at the first operation, open the valves on the positive electrolyte output and input pipelines , The valve is closed after the electrolyte is input to the positive electrode; when the battery is charging and discharging, the electrolyte is only transported to the negative electrode for circulation.

[0042] by image 3 It can be seen that the battery electrode area is 36cm 2 , Charge and discharge current density: 40mA/cm 2 , Charging time 1h, battery coulomb efficiency: 96%, voltage efficiency: 86%, energy efficiency: 83%.

Example Embodiment

[0043] Example 2

[0044] 1) The positive electrode adopts three carbon felts of 4x4x0.5cm specifications, and the negative electrode adopts one carbon felt of 4x4x0.5cm specifications.

[0045] 2) Prepare 60ml of 2mol/L zinc bromide solution for use.

[0046] The battery assembly and operation are the same as in Example 1

[0047] The single cell includes a positive terminal plate, a positive current collector, a positive electrode, Nafion117 membrane, a negative electrode, a negative current collector, and a negative terminal plate in order.

[0048] by Figure 4 It can be seen that the battery electrode area is 36cm 2 , Charge and discharge current density: 40mA/cm 2 , Charging time 1.5h, battery Coulomb efficiency: 96%, voltage efficiency: 86%, energy efficiency: 81%.

Example Embodiment

[0049] Example 3

[0050] 1) The positive electrode uses two 4x4x0.5cm carbon felts, and the negative electrode uses one 4x4x0.5cm carbon felt

[0051] 2) Prepare 60ml of 2mol/L zinc bromide solution for use.

[0052] The battery assembly and operation are the same as in Example 1

[0053] The single cell includes a positive electrode terminal plate, a positive electrode current collector, a positive electrode, a PP porous film, a negative electrode, a negative electrode current collector, and a negative electrode terminal plate in order.

[0054] by Figure 5 It can be seen that the battery electrode area is 36cm 2 , Charge and discharge current density: 40mA/cm 2 , Charging time 2h, battery Coulomb efficiency: 94%, voltage efficiency: 86%, energy efficiency: 81%.

PUM

Property	Measurement	Unit
Area	36.0	cm²
Charge and discharge current density	40.0	ma/cm²

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

big space
Increase charging capacity

Zinc-bromine single-flow battery

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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