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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 agents and carbon materials, with a complex structure
Moreover, although the positive electrode adopts the method of coating the active material with carbon felt, so that the positive electrode does not need to be filled with electrolyte, there is also a small amount of active material in the positive electrode cavity, which affects the charging capacity of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) A carbon felt with a size of 4x4x0.5cm is used for the positive electrode, and a carbon felt with a size of 4x4x0.5cm is used for the negative electrode

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

[0036] Battery assembly:

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

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

[0039] On the negative electrode electrolyte output pipeline, a branch pipeline is p...

Embodiment 2

[0044] 1) Three carbon felts of 4x4x0.5cm are used for the positive electrode, and one carbon felt of 4x4x0.5cm is used for the negative electrode

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

[0046] Battery assembly and operation mode is the same as embodiment 1

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

[0048] Depend on Figure 4 It can be seen that the electrode area of ​​the battery is 36cm 2 , charge and discharge current density: 40mA / cm 2 , charging time 1.5h, battery coulombic efficiency: 96%, voltage efficiency: 86%, energy efficiency: 81%.

Embodiment 3

[0050] 1) Two carbon felts of 4x4x0.5cm are used for the positive electrode, and one carbon felt of 4x4x0.5cm is used for the negative electrode

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

[0052] Battery assembly and operation mode is the same as embodiment 1

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

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

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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.

Description

technical field [0001] The invention relates to the technical field of single-flow batteries, in particular to the field of zinc-bromine single-flow batteries. Background technique [0002] Zinc-bromine redox flow battery (ZBB) is a low-cost, high-efficiency, environment-friendly flow energy storage battery with high energy density and current efficiency, simple and easy-to-operate device, and long service life. , low cost and other advantages, mainly used in power grid peak regulation, renewable energy generation such as wind energy and solar energy, electric vehicles and other fields. [0003] The traditional zinc-bromine flow battery adopts a double-pump and double-pipe design. During the charging and discharging process, the circulating pump is used to drive the electrolyte to circulate in the battery. When the battery is not working, the electrolyte is extracted from the battery cavity and stored in the liquid storage tank, so that the electrolyte is disconnected betwe...

Claims

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Application Information

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IPC IPC(8): H01M8/18H01M4/88H01M4/86
CPCH01M4/86H01M4/8892H01M8/188Y02E60/50
Inventor 赖勤志张华民李先锋许鹏程
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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