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Negative electrode electrolyte for all-iron flow battery

A negative electrode electrolyte and flow battery technology, which is applied in fuel cells, aqueous electrolytes, regenerative fuel cells, etc., can solve the problems of poor reversibility of deposition/dissolution reactions, achieve improved deposition/dissolution reversibility, low additional cost, and easy operation Effect

Pending Publication Date: 2022-04-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a negative electrode electrolyte for an all-iron redox flow battery, to solve the problem of poor reversibility of deposition / dissolution reactions in the negative electrode of the all-iron redox flow battery, and to prolong the cycle life of the all-iron redox flow battery

Method used

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  • Negative electrode electrolyte for all-iron flow battery
  • Negative electrode electrolyte for all-iron flow battery
  • Negative electrode electrolyte for all-iron flow battery

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Embodiment

[0036] In this embodiment, the negative electrode electrolyte of the all-iron flow battery includes: FeCl 2 As reactive species, DMSO as complex, NH 4 Cl as a supporting electrolyte, and deionized water. Among them, FeCl 2 The concentration is 0.5mol / L, and the concentration of dimethyl sulfoxide is 3mol / L, because this concentration of FeCl 2 After the complexation reaction with trisodium citrate, the conductivity of the electrolyte is the highest, and it can also ensure uniform deposition without affecting the polarization of the battery. NH 4 The concentration of Cl is 2mol / L, by adding 2mol / L of NH 4 Cl can effectively improve the conductivity of the electrolyte and maintain the pH of the electrolyte at 4.0. The weakly acidic environment can inhibit the hydrolysis of the electrolyte in the air.

[0037] Taking 50mL negative electrode electrolyte as an example, the specific operation steps are:

[0038] Weigh 4.96g of ferrous chloride and 4.68g of dimethyl sulfoxide li...

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Abstract

The invention belongs to the technical field of flow battery energy storage, and particularly relates to a negative electrode electrolyte for an all-iron flow battery. According to the electrolyte, dimethyl sulfoxide or a derivative thereof is added into ferrous ions and a supporting electrolyte, the ferrous ions serve as an active substance, the supporting electrolyte adjusts the pH of the negative electrode electrolyte and improves the ionic conductivity of the electrolyte, and the addition of the dimethyl sulfoxide or the derivative thereof enables the ferrous ions to be more uniform and compact during a deposition reaction; the hydrogen evolution reaction is reduced; the reversibility of the negative electrode reaction is improved. The negative electrode electrolyte of the total-iron flow battery is low in cost and simple and convenient to operate, and the cycle life of the total-iron flow battery can be effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of liquid flow battery energy storage, and in particular relates to a negative electrode electrolyte for an all-iron liquid flow battery. Background technique [0002] With the depletion of non-renewable energy and the increasing environmental pollution, people pay more and more attention to the development and utilization of renewable energy, such as: wind energy, solar energy, etc. However, due to their discontinuity, large-scale Energy storage equipment, among which the all-iron redox flow battery system (All-iron Redox Flow Battery) is referred to as the all-iron redox flow battery because of its power and energy separation design, safe, reliable, and low cost, and the all-iron redox flow battery is because of its positive and negative electrodes Both use iron ions as the active material, and the positive electrode is Fe 2+ / Fe 3+ The reaction between the negative electrode is Fe / Fe 2+ The reaction be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0002Y02E60/50
Inventor 唐奡宋玉玺严川伟李瑛
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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