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Electrolyte rebalancing method of all-iron flow battery

An electrolyte and flow battery technology, used in fuel cells, electrolyte flow processing, regenerative fuel cells, etc., can solve problems such as complex operation, and achieve the effects of simple operation, precise control and regeneration, and high precision

Pending Publication Date: 2022-07-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction requires high temperature and high pressure conditions, and hydrogen is an explosive chemical, so the operation is complicated

Method used

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  • Electrolyte rebalancing method of all-iron flow battery
  • Electrolyte rebalancing method of all-iron flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Rebalance of unbalanced electrolyte and its performance evaluation

[0022] 1. Based on FeCl 2 The anode electrolyte configuration process:

[0023] 1). First, add 0.1M HCl solution to deionized water, adjust the pH of the solution to 3.5, and prepare 80ml weakly acidic solution 1.

[0024] 2).Weigh 0.1mol FeCl 2 It was slowly added into solution 1, and the pH value of the solution was monitored with a pH meter during the addition process, and the pH value of the solution was adjusted to maintain at 3.5 by adding deionized water and a trace amount of HCl to obtain an acidic solution 2.

[0025] 3). Transfer solution 2 to a 100ml volumetric flask, add a small amount of deionized water for constant volume, and obtain 100ml of 1mol / L FeCl as a positive electrolyte 2 The solution is ready to use.

[0026] 2. Preparation of positive electrolyte:

[0027] The positive electrode electrolyte was prepared with the same negative electrode electrolyte, and the posi...

Embodiment 2-6

[0036] Example 2-6 Rebalance of unbalanced electrolyte under different conditions and its performance evaluation

[0037] In order to simplify the description and enhance the contrast effect, Examples 2-19 are based on Example 1, respectively, and the electrolyte performance obtained by changing the regeneration conditions such as anode fuel solution, discharge current, and reaction temperature. The specific formula and beneficial effects are shown in Table 1.

[0038] It can be seen from Table 1 that after the electrolyte is regenerated, it is applied to an all-iron flow battery. Compared with the battery using the new electrolyte, the Coulombic efficiency, voltage efficiency, energy efficiency, first cycle capacity and cycle stability are comparable, indicating that the electrolytic solution The liquid regeneration method achieves the intended purpose.

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Abstract

The invention belongs to the field of electrochemical energy storage, and particularly relates to an electrolyte rebalancing method of an all-iron flow battery. In the long-term charge-discharge cycle process of an all-iron flow battery, due to negative electrode hydrogen evolution side reaction, poor reversibility and the like, high-valence iron ions in a positive electrode electrolyte are accumulated, and finally the capacity of the battery is attenuated. In order to solve the problems, the electrolyte rebalancing method of the total iron flow battery is developed, a reaction device capable of rebalancing the positive electrolyte is constructed, small organic molecules are adopted as anode fuel, the unbalanced positive electrolyte rich in high-valence iron ions is adopted as cathode electrolyte, meanwhile, the reaction device can also release electric energy, and the method is simple to operate and low in cost. The regulation and control precision is high.

Description

technical field [0001] The invention belongs to the fields of electrochemical energy storage technology and flow batteries, and particularly relates to an electrolyte rebalancing method for an all-iron flow battery. Background technique [0002] In order to accelerate the process of carbon peaking and carbon neutrality, speed up the development and utilization of clean energy, and promote the realization of parity and subsidy-free access to onshore wind power and photovoltaic power generation is imminent. However, this type of clean energy power has discontinuous and unstable characteristics, which lead to the utilization rate. The development of new energy storage technologies, the improvement of new energy power consumption capacity, and the improvement of the flexible adjustment level of the power system are expected to increase the proportion of clean energy power in my country's energy consumption. [0003] Flow batteries store electrical energy in an electrolyte with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04276H01M8/18H01M8/04186H01M8/06
CPCH01M8/04276H01M8/188H01M8/04186H01M8/0693H01M8/06
Inventor 程元徽王绍聪
Owner BEIJING UNIV OF CHEM TECH