Electrolyte for flow battery and polyhalide-chromium flow battery

A flow battery and electrolyte technology, applied in fuel cells, regenerative fuel cells, electrochemical generators, etc., can solve problems such as restricting commercial development, expensive heat dissipation equipment, and limited energy density ferrous ions, etc. Effects of high electrochemical redox activity, charge-discharge energy efficiency retention, and good chemical stability

Active Publication Date: 2021-04-02
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the relatively mature flow batteries basically use vanadium-sulfuric acid electrolyte, because the extraction process of vanadium salt required in the electrolyte is cumbersome, the price is high, the battery operating temperature range is narrow, and expensive heat dissipation equipment is required, resulting in the flow battery system The overall high cost limits its large-scale promotion and application
Another relatively mature electrolyte system for flow batteries is iron-chromium electrolyte. Although its cost is relatively low, its energy density is limited by the solubility of ferrous ions, and its solubility is low, only 1.3mol / L And the electric pair potential of ferrous iron / ferric ferric is low, and the output voltage of the battery is only about 1.0V, resulting in the energy density of the iron-chromium electrolyte being only about 17Wh / L, which restricts its commercial development

Method used

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  • Electrolyte for flow battery and polyhalide-chromium flow battery
  • Electrolyte for flow battery and polyhalide-chromium flow battery
  • Electrolyte for flow battery and polyhalide-chromium flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The electrolytic solution for the flow battery of the present invention may be a chromium-bromine electrolytic solution. The preparation scheme of the electrolyte includes, using 2.0mol of Cr(OH) 3 React with 6.0 mol of hydrochloric acid and 3.0 mol of hydrobromic acid, stir well to completely dissolve chromium hydroxide, then add a certain amount of pure water to prepare 2.0 mol / L CrCl 3 +3.0mol / L HBr chromium-bromine electrolyte 1.0L, take a certain amount of the chromium-bromine electrolyte as the positive and negative electrolytes, put it into the chromium-bromine flow battery for charge and discharge test.

[0024] When charging, the positive electrode electrolyte and the negative electrode electrolyte are sent from the positive electrode electrolyte and negative electrode electrolyte storage tanks to the positive electrode and the negative electrode respectively, and the trivalent chromium ions in the negative electrode electrolyte are reduced to divalent chromium...

Embodiment 2

[0027] This embodiment provides a chromium-bromine electrolyte solution for a chromium-bromine flow battery, reacting 4.8 mol of chromium hydroxide with 15.4 mol of hydrochloric acid and 4.0 mol of hydrobromic acid, fully stirring to completely dissolve the chromium hydroxide, and then adding A certain amount of clear water is prepared to produce 2.4mol / L CrCl 3 +0.5mol / L HCl+2.0mol / L HBr Chromium bromine electrolyte 2.0L, divided into positive and negative chromium bromine electrolyte 1.0L each, put into chromium bromine flow battery for charge and discharge. The results show that the chromium-bromine flow battery single cell using the chromium-bromine electrolyte has a current density of 300mA cm -2 Under certain conditions, the energy efficiency reaches 85%, and the coulombic efficiency is higher than 95%.

[0028]As the battery cycle progresses, the trivalent chromium ions in the negative electrode are accompanied by hydrogen evolution reaction during charging, which will...

Embodiment 3

[0046] This embodiment provides a multi-halide-chromium flow battery, and its electrochemical performance test:

[0047] A method for preparing a polyhalide-chromium flow battery, comprising the following steps;

[0048] Step 1: Electrolyte configuration:

[0049] Positive electrode electrolyte: 25mL aqueous solution containing 3mol / L HBr and 1mol / L CrCl 3 .

[0050] Negative electrode electrolyte: 25mL aqueous solution, which contains 3mol / L HBr and 1mol / L CrCl 3 .

[0051] Step 2: Battery Assembly:

[0052] Single battery structure and system see image 3 , from left to right are positive current collector, positive electrode (2×2cm 2 carbon cloth), separator (Nafion HP), negative electrode (2×2cm 2 carbon cloth), negative current collector;

[0053] Step 3: Battery Test:

[0054] At 55 degrees Celsius, single cell at 300, 400, 500 and 600mA / cm 2 The constant current charge and discharge curve at the current density is as follows Figure 4 As shown, the operating ...

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Abstract

The invention discloses an electrolyte for a flow battery and a polyhalide-chromium flow battery. The electrolyte for the flow battery is prepared by reacting cheap and easily available chromium hydroxide with hydrochloric acid and hydrobromic acid. Before charging (the state of charge is 0%), the components of the positive and negative electrolyte are consistent, and include trivalent chromium ions, chloride ions, bromide ions and hydrogen ions. The electrolyte has the beneficial effects that: the electrolyte for the flow battery has the advantages of high energy density, low cost, high charging and discharging performance, long cycle life, wide operating temperature interval and the like, and has a wide application prospect in the field of fixed large-scale power storage.

Description

technical field [0001] The invention belongs to the field of flow batteries, and relates to an electrolyte solution for a flow battery and a polyhalide-chromium flow battery. Background technique [0002] At present, the relatively mature flow batteries basically use vanadium-sulfuric acid electrolyte, because the extraction process of vanadium salt required in the electrolyte is cumbersome, the price is high, the battery operating temperature range is narrow, and expensive heat dissipation equipment is required, resulting in the flow battery system The overall high cost limits its large-scale promotion and application. Another relatively mature electrolyte system for flow batteries is iron-chromium electrolyte. Although its cost is relatively low, its energy density is limited by the solubility of ferrous ions, and its solubility is low, only 1.3mol / L And the potential of the ferrous iron / ferric ferroelectric pair is low, and the output voltage of the battery is only about...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 曾义凯
Owner SOUTHWEST JIAOTONG UNIV
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