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Neutral aqueous system liquid flow battery system

A technology of flow battery and flow battery stack, which is applied to fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of prone to water electrolysis side reactions, limited solubility of active materials, and easy cross-contamination of electrolytes, and achieves cost-effectiveness. Low, high solubility, high safety performance

Active Publication Date: 2021-10-12
CHINASALT JINTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, aqueous organic flow batteries still face some challenges, such as limited solubility of active materials (organic substances), easy cross-contamination of electrolytes, low operating current density, and prone to water electrolysis side reactions, etc.

Method used

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  • Neutral aqueous system liquid flow battery system
  • Neutral aqueous system liquid flow battery system
  • Neutral aqueous system liquid flow battery system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Synthesis of 1,1'-bis(3-(trimethylamino)propyl)-[4,4'-bipyridyl]tetrabromosalt

[0079] 0.47g (3.0mmol) of 4,4'-bipyridine and 1.27g (7.0mmol) of (3-bromopropyl)trimethylammonium bromide were mixed and dissolved in 30mL of acetonitrile. The temperature was raised slowly to reflux, and a light yellow solid was produced after 24 hours of reflux. Then the reaction solution was left standing overnight in the refrigerator. The precipitated product was filtered, washed and dried with ethanol, and recrystallized with methanol / ethanol (1:1, v / v) to obtain a solid. The product was characterized by NMR, and 1.43 g of the product was obtained with a yield of 92%.

[0080] Pale yellow solid, 1 HNMR (400MHz,D 2 O), δ9.25(d, J=7.0Hz, 4H), 8.67(d, J=6.9Hz, 4H), 5.04–4.85(m, 4H), 3.77–3.54(m, 4H), 3.24(s ,18H),2.87–2.60(m,4H); 13 C NMR (101MHz, D 2 O) δ 150.58, 145.73, 127.59, 62.43, 58.29, 53.30, 24.67.

Embodiment 2

[0082] Synthesis of (3-(trimethylamino)propyl)-[4,4'-bipyridyl]tribromide

[0083] 0.47g (3.0mmol) of 4,4'-bipyridine and 0.54g (3.0mmol) of (3-bromopropyl)trimethylammonium bromide were mixed and dissolved in 30mL of acetonitrile. The temperature was raised slowly to reflux, and a white solid was produced after reflux for 24 hours. Then the reaction solution was left standing overnight in the refrigerator. The precipitated product was filtered, washed and dried with ethanol, and recrystallized with methanol / ethanol (1:1, v / v) to obtain a solid. The product was characterized by NMR, and 0.91 g of the product was obtained with a yield of 90%.

[0084] white solid, 1 H NMR (400MHz,D 2 O)δ9.10(d, J=6.9Hz, 2H), 8.90–8.63(m, 2H), 8.48(d, J=6.9Hz, 2H), 8.04–7.80(m, 2H), 4.86(t, J=7.7Hz, 2H), 3.78–3.49(m, 2H), 3.25(s, 9H), 2.89–2.46(m, 2H); 13 C NMR (101MHz, D 2 O) δ154.32, 150.02, 144.99, 142.27, 126.45, 122.55, 62.50, 57.73, 53.35, 24.66.

Embodiment 3

[0086] Synthesis of 1,1'-bis(4-bromobutyl)-[4,4'-bipyridyl]dibromide

[0087] 0.47g (3.0mmol) of 4,4'-bipyridine and 1.51g (7.0mmol) of 1,4-dibromobutane were mixed and dissolved in 30mL of acetonitrile. The temperature was raised slowly to reflux, and a light yellow solid was produced after 24 hours of reflux. Then the reaction solution was left standing overnight in the refrigerator. The precipitated product was filtered, washed and dried with ethanol, and recrystallized with methanol / ethanol (1:1, v / v) to obtain a solid. The product was characterized by NMR, and 1.66 g of the product was obtained with a yield of 94.1%.

[0088] Pale yellow solid, 1 HNMR (400MHz,D 2 O), δ9.21(t, J=6.2Hz, 4H), 8.63(d, J=5.5Hz, 4H), 5.06–4.70(m, 7H), 3.60(t, J=6.4Hz, 2H), 2.52–2.20(m,4H),2.19–1.91(m,2H); 13 C NMR (101MHz,D 2 O) δ145.59, 127.38, 127.19, 61.33, 33.27, 29.41, 28.53.

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Abstract

The invention provides a liquid flow battery system with a neutral water phase system, which includes: two electrolyte liquid storages, the two electrolyte liquid storages are spaced apart and arranged oppositely, and the electrolyte liquid storages are formed after the mining of salt mines. The salt cavern of the physical dissolution cavity contains electrolyte solution in the dissolution cavity, and the electrolyte solution includes positive electrode active material, negative electrode active material and supporting electrolyte, the positive electrode active material is a bromine salt compound; the negative electrode active material is a bipyridine compound; and the negative electrode active material are directly dissolved or dispersed in a water-solvent system in the form of bulk and stored in two salt caverns respectively, and the supporting electrolyte is dissolved in the system. The neutral aqueous phase system liquid flow battery system can be applied to the battery environment of the salt cave system (using the electrolyte generated in situ), and has the advantages of low cost, easy preparation of active materials, high safety performance, high energy density, and stable charge and discharge performance , The advantages of high solubility of active materials.

Description

technical field [0001] The invention relates to the field of liquid flow batteries, in particular to a liquid flow battery system with a neutral aqueous phase system. Background technique [0002] With the rapid development of the human economy, the problems of environmental pollution and energy shortage are becoming more and more serious, which has prompted countries all over the world to extensively develop and utilize renewable energy such as wind energy, solar energy, and tidal energy. However, these renewable energy sources are discontinuous, unstable, restricted by regional environment, and difficult to connect to the grid, resulting in low utilization rate, high wind and light abandonment rate, and waste of resources. Therefore, it is necessary to vigorously develop efficient, cheap, safe and reliable energy storage technology that can be used in conjunction with it. [0003] Among various electrochemical energy storage strategies, compared with static batteries such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18H01M8/2455
CPCH01M8/188H01M8/2455Y02E60/50
Inventor 徐俊辉陈留平苏志俊崔耀星韩俊甜武奕李丹
Owner CHINASALT JINTAN
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