Alkaline zinc-iron electrochemical flow cell

A liquid flow battery, zinc-iron technology, applied in the direction of alkaline electrolyte, fuel cell, battery electrode, etc., can solve the problems of increasing battery maintenance cost, battery voltage efficiency drop, battery energy efficiency attenuation, etc., to reduce electrolyte migration problems, system maintenance cost reduction, effect of high open circuit voltage
CN109509901AActive Publication Date: 2019-03-22DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Publication Date
2019-03-22

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Abstract

The invention relates to an alkaline zinc-iron electrochemical flow cell. The alkaline zinc-iron electrochemical flow cell is composed of a battery module, an electrolyte storage tank, a circulating pump and a circulation pipeline, wherein the battery module is formed by connecting one single battery or more than two single batteries in series / in parallel; a positive electrode and a negative electrode adopt the same electrolyte, strong alkali serves as supporting electrolyte, carbon felts or carbon paper serves as the electrodes, a graphite plate serves as a current collecting plate to form the symmetric electrochemical flow cell; and the electrolyte of each of the positive electrode and the negative electrode is a mixed aqueous solution of ferrocyanide, zinc salt or / and zinc oxide and thestrong alkali. The symmetric alkaline zinc-iron electrochemical flow cell with the positive electrode and the negative electrode adopting the same electrolyte has the battery performance equivalent to that of a traditional alkaline zinc-iron electrochemical flow cell, meanwhile, due to the fact that the positive electrode and the negative electrode adopt the same electrolyte, the osmotic pressureof the electrolyte of the positive electrode and the electrolyte of the negative electrode is consistent, and therefore the problem of electrolyte migration caused by inconsistent osmotic pressure ofthe electrolyte of the positive electrode and the electrolyte of the negative electrode of the traditional alkaline zinc-iron electrochemical flow cell can be solved, and the maintenance cost of a system in the actual application process is effectively lowered.
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Description

technical field

[0001] The invention relates to the field of flow batteries, in particular to the technical field of alkaline zinc-iron flow batteries. Background technique

[0002] Liquid flow battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has the advantages of flexible system design, large storage capacity, free site selection, high energy conversion efficiency, deep discharge, safety and environmental protection, and low maintenance costs. It can be widely used in wind energy, solar energy and other renewable energy generation and energy storage, emergency power system, backup power station and power system peak shaving and valley filling. Due to the advantages of high safety, good stability, high efficiency, long life (life > 15 years), and low cost, all-vanadium redox flow batteries are considered to have good application prospects, but the electrolyte of VFB is expensive, which is To some extent, its ...

Claims

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