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Negative electrode for zinc-based flow battery, and battery and application thereof

A liquid flow battery, zinc-based technology, applied in the direction of battery electrodes, fuel cells, regenerative fuel cells, etc., can solve problems affecting battery performance, battery self-discharge, and reduce battery discharge capacity, etc., to achieve the effect of high electrochemical reaction activity

Active Publication Date: 2021-06-08
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

Due to the characteristics of the zinc-based flow battery diaphragm itself, during the charge-discharge cycle, the active material of the positive electrode will leak through the diaphragm to the negative electrode, and the active material of the positive electrode will easily contact with the active material of the negative electrode, resulting in self-discharge of the battery. Reduce the discharge capacity of the battery and affect the performance of the battery
In addition, since the deposition position of the zinc negative electrode of the zinc-based flow battery is at the interface between the electrode and the separator, when the zinc accumulates to a certain extent, zinc dendrites will grow into the pores of the separator, which will cause the positive and negative electrodes to be short-circuited. Affect battery life

Method used

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  • Negative electrode for zinc-based flow battery, and battery and application thereof
  • Negative electrode for zinc-based flow battery, and battery and application thereof
  • Negative electrode for zinc-based flow battery, and battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (The negative electrode is carbon felt plus copper foam, and the positive electrode is carbon felt)

[0035] The battery includes: a negative electrode collector, a negative electrode frame, a separator, a positive electrode frame, and a positive electrode collector. Among them, the negative electrode current collector and the positive electrode current collector are graphite plates; the material of the negative electrode frame and the positive electrode frame is PVC polyvinyl chloride, the thickness is 4mm; the diaphragm is a Dramatic porous film, the thickness is 0.9mm; the negative electrode and positive electrode The electrode area is 36cm 2 , charge and discharge current is 40mA / cm 2 , the negative electrode electrolyte is 60mL of 2mol / L zinc bromide solution. The negative electrode material is 3mm carbon felt + 1mm foam copper, and the positive electrode material is 5mm carbon felt. The positive electrode carbon felt is sealed inside the battery after being comp...

Embodiment 2

[0037] (The negative electrode is carbon felt plus nickel foam, and the positive electrode is carbon felt)

[0038] The battery includes: a negative electrode collector, a negative electrode frame, a separator, a positive electrode frame, and a positive electrode collector. Among them, the negative electrode current collector and the positive electrode current collector are graphite plates; the material of the negative electrode frame and the positive electrode frame is PVC polyvinyl chloride, the thickness is 4mm; the diaphragm is a Dramatic porous film, the thickness is 0.9mm; the negative electrode and positive electrode The electrode area is 36cm 2 , charge and discharge current is 40mA / cm 2 , the negative electrode electrolyte is 60mL of 2mol / L zinc bromide solution. The negative electrode material is 3mm carbon felt + 1mm nickel foam, and the positive electrode material is 5mm carbon felt. The positive electrode carbon felt is sealed inside the battery after being comp...

Embodiment 3

[0040] (The negative electrode is carbon felt plus copper foam, and the positive electrode is carbon felt)

[0041] The battery includes: a negative electrode collector, a negative electrode frame, a separator, a positive electrode frame, and a positive electrode collector. Among them, the negative electrode current collector and the positive electrode current collector are graphite plates; the material of the negative electrode frame and the positive electrode frame is PVC polyvinyl chloride, the thickness is 4mm; the diaphragm is a Dramatic porous film, the thickness is 0.9mm; the negative electrode and positive electrode The electrode area is 36cm 2 , charge and discharge current is 40mA / cm 2 , the negative electrode electrolyte is 60mL of 2mol / L zinc bromide solution. The negative electrode material is 3mm carbon felt + 0.6mm foam copper, and the positive electrode material is 5mm carbon felt. The positive electrode carbon felt is sealed inside the battery after being co...

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Abstract

The invention provides a long-life zinc-based flow battery. A negative electrode of the battery comprises a three-dimensional conductive carbon material and an inert conductive material; and the thickness of the inert conductive material is 20-50% of that of the three-dimensional conductive carbon material. According to the negative electrode and the battery, a self-discharge reaction caused by contact between the positive active material and the negative active material of the battery can be effectively inhibited, the coulombic efficiency of the battery is improved, a reaction interface for inducing zinc deposition occurs in the electrode, and the coulombic efficiency of the zinc-based flow battery is improved.

Description

technical field [0001] The invention belongs to the field of liquid flow, and in particular relates to a negative electrode of a zinc-based liquid flow battery, battery and application thereof. Background technique [0002] In order to solve the discontinuous characteristics of renewable energy such as wind energy and solar energy, large-scale energy storage technology has become the focus of attention. As a new type of large-scale energy storage system, zinc-bromine flow battery has the advantages of high energy density, low cost and strong reliability. [0003] At the same time, there are many problems to be solved in zinc-based flow batteries, and self-discharge is one of them. The role of the zinc-based flow battery electrode is to provide a reaction site for the electrochemical reaction of the active materials of the battery, and the reactivity of the electrode is very important for the electrochemical reaction. The active material in the battery will preferentially r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/18
CPCH01M4/8657H01M4/8605H01M8/188Y02E60/50
Inventor 苑辰光李先锋郑琼张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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