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Iron composite/halogen electrochemical system for flow electric storage

A complex and electrochemical technology, applied in the field of iron-complex/halogen new electrochemical system, can solve the problems of large energy loss, hydrogen evolution side reaction, slow reaction kinetics, etc., and achieve high energy conversion efficiency and low preparation cost , long service life effect

Inactive Publication Date: 2007-10-03
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Fe / Cr system has two major shortcomings that are difficult to overcome: (1) Cr in the negative electrode electrolyte +3 / Cr +2 The reaction kinetics of the reaction is too slow; the preparation of its electrocatalyst is relatively difficult, and the electrocatalyst is easily poisoned by impurities in the electrolyte, resulting in a large energy loss of the electrode reaction overpotential and a large amount of hydrogen evolution side reactions
(2) With the prolongation of the cycle time, cations permeate the ion exchange membrane, cross-contamination of the electrolyte occurs, and a separate rebalancing battery is required
However, the problem of cross-contamination between positive / negative electrode solutions is still the biggest obstacle to the widespread application of flow batteries. Even in all-vanadium batteries whose active materials are the same elements with variable valence, there is still some interaction between positive and negative electrode active ions. Osmosis, especially when cation exchange membranes are used, is serious
In addition, the positive sodium bromide solution of the PSB system is highly corrosive, and S precipitation is easy to occur in the negative sodium polysulfide solution; the high-concentration solution (>2mol / L) of the VRB system is unstable

Method used

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  • Iron composite/halogen electrochemical system for flow electric storage
  • Iron composite/halogen electrochemical system for flow electric storage
  • Iron composite/halogen electrochemical system for flow electric storage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh an appropriate amount of Fe 2 (SO 4 ) 3 and ligand-EDTA, the molar ratio of the two is 0.5 (0.5mol Fe 2 (SO 4 ) 3 Equivalent to 1molFe 3+ ion), dissolved in 1M sodium acetate aqueous solution, dissolved by magnetic stirring at room temperature, and then made into 0.1M Fe(III)-EDTA complex aqueous solution, and the pH value of the solution was maintained at about 5.5. An appropriate amount of NaBr was weighed and dissolved in water, and dissolved by magnetic stirring at room temperature to prepare a 1M NaBr aqueous solution.

[0026] Nafion117 membrane (DuPont, USA) was selected as the cation exchange membrane separating the positive / negative electrolyte. The membrane needs to be treated as follows before use: heat treatment in a water bath of 353K in a 1.0mol / L NaOH aqueous solution for 2h, then, use the After washing with ionized water, the hydrogen-type membrane is converted into a Na-type membrane, which can be used in batteries.

[0027] The prepared po...

Embodiment 2

[0030] The raw material Fe used in the preparation of negative electrolyte 2 (SO4) 3 With embodiment 1: take by weighing an appropriate amount of Fe 2 (SO4) 3 and ligand-sodium citrate, the molar ratio of the two is 0.5, dissolved in 1M sodium acetate aqueous solution, dissolved by magnetic stirring at room temperature, and made into 0.7M Fe(III)-citric acid complex aqueous solution. The pH value remains between 5-6. The prepared negative electrolyte was stored for later use.

[0031] The preparation of the positive electrode electrolyte is the same as that in Example 1: Weigh an appropriate amount of NaBr and dissolve it in water, and after magnetic stirring at room temperature to dissolve, it is made into a 2M NaBr aqueous solution.

[0032] 50 mL of the prepared positive / negative electrolyte were placed in the peripheral liquid storage bottles on both sides of the battery, and assembled into a battery as shown in Figure 1. The operating conditions of the battery are th...

Embodiment 3

[0034] The raw material Fe used in the preparation of negative electrolyte 2 (SO 4 ) 3 With Example 1, weigh an appropriate amount of ligand-triethanolamine (TEA) and Fe 2 (SO 4 ) 3 , the molar ratio of the two is 3. After mixing, add an appropriate amount of NaOH to adjust the pH value of the solution to about 13. At room temperature, magnetically stir, dissolve in 0.4M sodium chloride supporting electrolyte aqueous solution, and prepare 0.4M Fe (III)-TEA complex aqueous solution. The prepared negative electrolyte was stored for later use.

[0035] The preparation of the positive electrode electrolyte is the same as that in Example 1: Weigh an appropriate amount of NaBr and dissolve it in water, and after magnetic stirring at room temperature to dissolve, it is made into a 2M NaBr aqueous solution.

[0036] 50 mL of the prepared positive / negative electrolyte were placed in the peripheral liquid storage bottles on both sides of the battery, and assembled into a battery a...

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Abstract

A Fe-matched matter-halogen electrochemical system used on liquid flow energy storage is prepared as separating positive / negative electrode electrolyte by positive ion exchange film and storing said electrolyte in external container, generating charge / discharge process by making oxidation / reduction reaction on inert carbon felt electrode through pump stream via battery, applying soluble Fe(III) / Fe(II) -matched matter oxidation / reduction electric pair as negative electrode and applying halogen oxidation / reduction electric pair as positive electrode.

Description

technical field [0001] The invention relates to a liquid flow energy storage battery in the field of electrochemical energy storage, in particular to an iron-complex / halogen novel electrochemical system for liquid flow power storage; it is mainly suitable for large-scale electric energy storage, power grid peak regulation, and backup power. Background technique [0002] With the increasing shortage of traditional fossil energy supply and the deterioration of the ecological environment, research and large-scale utilization of renewable energy has become an important strategy for my country's energy security and sustainable development. Renewable energy, such as wind, solar and wave power generation, is greatly affected by changes in day and night and weather, and it is urgent to develop a large-scale energy storage technology supporting it to ensure the continuity and stability of power generation and power supply. In addition, the development of large-scale energy storage c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M10/36H01M6/00H01M12/00H01M4/36H01M2/40H01M8/20H01M50/77
CPCY02E60/528Y02E60/50
Inventor 张华民文越华钱鹏衣宝廉
Owner DALIAN RONGKE POWER
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