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A kind of negative electrode for zinc-based flow battery and its battery and application

A flow battery and anode technology, applied in battery electrodes, fuel cells, regenerative fuel cells, etc., can solve problems such as affecting battery performance, affecting battery life, and short-circuiting between positive and negative electrodes, and achieve high electrochemical reactivity. Effect

Active Publication Date: 2022-05-20
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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  • A kind of negative electrode for zinc-based flow battery and its battery and application
  • A kind of negative electrode for zinc-based flow battery and its battery and application
  • A kind of negative electrode for zinc-based flow battery and its battery and application

Examples

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Effect test

Embodiment 1

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

[0035] The battery includes: a negative electrode current collector, a negative electrode electrode frame, a separator, a positive electrode electrode frame, and a positive electrode current collector. The negative electrode current collector and the positive electrode current collector are graphite plates; the negative electrode frame and the positive electrode frame are made of PVC polyvinyl chloride with a thickness of 4mm; the diaphragm is a Dramic porous film with a thickness of 0.9mm; the area of ​​the negative electrode and the positive electrode is 36cm 2 , the charge and discharge current is 40mA / cm 2 , the negative electrolyte is 60 mL of 2 mol / 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 carbon felt was completely immersed in a 2 mol / L zin...

Embodiment 2

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

[0038] The battery includes: a negative electrode current collector, a negative electrode electrode frame, a separator, a positive electrode electrode frame, and a positive electrode current collector. The negative electrode current collector and the positive electrode current collector are graphite plates; the negative electrode frame and the positive electrode frame are made of PVC polyvinyl chloride with a thickness of 4mm; the diaphragm is a Dramic porous film with a thickness of 0.9mm; the area of ​​the negative electrode and the positive electrode is 36cm 2 , the charge and discharge current is 40mA / cm 2 , the negative electrolyte is 60 mL of 2 mol / 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 carbon felt was completely immersed in a 2 mol / L zinc ...

Embodiment 3

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

[0041] The battery includes: a negative electrode current collector, a negative electrode electrode frame, a separator, a positive electrode electrode frame, and a positive electrode current collector. The negative electrode current collector and the positive electrode current collector are graphite plates; the negative electrode frame and the positive electrode frame are made of PVC polyvinyl chloride with a thickness of 4mm; the diaphragm is a Dramic porous film with a thickness of 0.9mm; the area of ​​the negative electrode and the positive electrode is 36cm 2 , the charge and discharge current is 40mA / cm 2 , the negative electrolyte is 60 mL of 2 mol / 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 carbon felt was completely immersed in a 2 mol / L z...

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Abstract

The invention provides a long-life zinc-based liquid flow battery. The negative electrode of the battery includes a three-dimensional conductive carbon material and an inert conductive material; the thickness of the inert conductive material is 20%-50% of the three-dimensional conductive carbon material. The negative electrode and the battery of the present invention can effectively inhibit the self-discharge reaction of the positive electrode active material of the battery and the negative electrode active material in contact, improve the coulombic efficiency of the battery, and induce the reaction interface of zinc deposition to occur inside the electrode, thereby improving the coulombic efficiency of the zinc-based flow battery. efficiency.

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, a battery and applications thereof. Background technique [0002] In order to solve the discontinuous power generation characteristics of renewable energy sources 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, zinc-based flow batteries also have many problems to be solved, 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 battery active material, and the reactivity of the electrode is very important for the electrochemical reaction. The active species in the battery will ...

Claims

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Application Information

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Patent Type & Authority Patents(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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