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CN-121983626-A - Aqueous organic flow battery with polysubstituted pyridinium derivative as negative electrode electrolyte

CN121983626ACN 121983626 ACN121983626 ACN 121983626ACN-121983626-A

Abstract

The application provides a water-based organic flow battery taking a polysubstituted pyridinium derivative as a negative electrode electrolyte, and belongs to the technical field of redox flow batteries. The electrolyte of the negative electrode electrolyte is a polysubstituted pyridinium derivative. The polysubstituted pyridinium derivative disclosed by the application has excellent redox reversibility and electrochemical stability, can endow the corresponding aqueous organic flow battery with long cycle life and low energy attenuation, still maintains stable electrochemical performance after 3000 cycles, and has an average capacity attenuation speed of 0.00013%/cycle (0.0025%/d).

Inventors

  • ZHANG GUOYING
  • LI YANYU
  • Zuo Zhengyang
  • HAO WENTAO
  • LIU RUI

Assignees

  • 中国科学院山西煤炭化学研究所

Dates

Publication Date
20260505
Application Date
20260129

Claims (10)

  1. 1. A water-based organic flow battery taking a polysubstituted pyridinium derivative as a negative electrode electrolyte is characterized in that the water-based organic flow battery comprises positive electrode electrolyte, a diaphragm and the negative electrode electrolyte which are assembled; the electrolyte of the negative electrode electrolyte is one or more than two polysubstituted pyridine salt derivatives; the structural general formula of the polysubstituted pyridinium derivative is as follows: ; Wherein R 1 、R 2 、R 3 、R 4 can be independently selected from the group consisting of-CH 3 , 、 Wherein R 1 、R 2 、R 3 、R 4 may be the same or different.
  2. 2. The aqueous organic flow battery taking the polysubstituted pyridinium derivative as the negative electrode electrolyte according to claim 1, wherein the concentration of the electrolyte in the negative electrode electrolyte is 0.1-0.5 mol/L.
  3. 3. The aqueous organic flow battery with the polysubstituted pyridinium derivative as the negative electrode electrolyte according to claim 1, wherein the electrolyte of the positive electrode electrolyte is one or more of Na 4 [Fe(CN) 6 ]、K 4 [Fe(CN) 6 , TEMPO and KI.
  4. 4. The aqueous organic flow battery using the polysubstituted pyridinium derivative as a negative electrode electrolyte according to claim 1, wherein the concentration of the electrolyte in the positive electrode electrolyte is 0.1-0.8 mol/L.
  5. 5. The aqueous organic flow battery with the polysubstituted pyridinium derivative as a negative electrode electrolyte according to claim 1, wherein the membrane is a cation exchange membrane.
  6. 6. The aqueous organic flow battery with the polysubstituted pyridinium derivative as a negative electrode electrolyte according to claim 5, wherein the cation exchange membrane is one of Thinkre N-212,Nafion 212,Nafion 117.
  7. 7. The aqueous organic flow battery using the polysubstituted pyridinium derivative as a negative electrode electrolyte according to claim 1, wherein a supporting electrolyte is added to the positive electrode electrolyte.
  8. 8. The aqueous organic flow battery using the polysubstituted pyridinium derivative as a negative electrode electrolyte according to claim 1, wherein a supporting electrolyte is added to the negative electrode electrolyte.
  9. 9. The aqueous organic flow battery with the polysubstituted pyridinium derivative as a negative electrode electrolyte according to claim 7 or 8, wherein the supporting electrolyte is any one or more of sodium sulfate, potassium sulfate, sodium chloride and potassium chloride.
  10. 10. The aqueous organic flow battery using the polysubstituted pyridinium derivative as a negative electrode electrolyte according to claim 9, wherein the molar concentration of the supporting electrolyte is 1-2 mol/L.

Description

Aqueous organic flow battery with polysubstituted pyridinium derivative as negative electrode electrolyte Technical Field The invention belongs to the technical field of redox flow batteries, and particularly relates to a water-based organic flow battery taking a polysubstituted pyridinium derivative as a negative electrode electrolyte. Background According to the energy development planning, clean energy becomes an important point of national energy development. Such as wind, water, solar, etc. However, these energy sources are greatly affected by regions, weather, time, etc., and have intermittent and fluctuating properties. To realize large-scale utilization of these energy sources, a low-cost and long-life efficient grid energy storage system is required to balance fluctuation of the generated energy and user demands. The lithium ion battery of the current mainstream energy storage technology has a double short plate with safety and large-scale suitability, and is difficult to meet the energy storage requirement of a renewable energy power grid in the future. The all-vanadium redox flow battery has the problems of higher cost, resource shortage and the like. Compared with the prior art, the new generation of water-based flow battery has the advantages that the water-based flow battery is designed with diversified organic molecules as active electrolyte, so that the energy storage cost can be greatly reduced, the stability, the solubility and the electrode potential of the electrolyte can be regulated and controlled, and the water-based flow battery is an important way for developing the next generation of low-cost and high-capacity novel energy storage technology. Disclosure of Invention Aiming at the technical problems, the invention provides a water-based organic flow battery which has the characteristics of long circulation and low attenuation and takes a polysubstituted pyridinium derivative as a negative electrode electrolyte In order to solve the technical problems, the invention adopts the following technical scheme: the aqueous organic flow battery taking the polysubstituted pyridinium derivative as a negative electrode electrolyte comprises a positive electrode electrolyte, a diaphragm and a negative electrode electrolyte which are assembled; the electrolyte of the negative electrode electrolyte is one or more than two polysubstituted pyridine salt derivatives; the structural general formula of the polysubstituted pyridinium derivative is as follows: Wherein R 1、R2、R3、R4 can be independently selected from the group consisting of-CH 3, 、Wherein R 1、R2、R3、R4 may be the same or different. Further, the concentration of the electrolyte in the negative electrode electrolyte is 0.1-0.5 mol/L. Further, the electrolyte of the positive electrode electrolyte is one or more of Na 4[Fe(CN)6]、K4[Fe(CN)6, TEMPO and KI. Further, the concentration of the electrolyte in the positive electrode electrolyte is 0.1-0.8 mol/L. Further, the concentration of the electrolyte in the positive electrode electrolyte is preferably 0.1 to 0.5 mol/L. Further, the membrane is a cation exchange membrane. Further, the cation exchange membrane is one of Thinkre N-212,Nafion 212,Nafion 117. Further, a supporting electrolyte is added to the positive electrode electrolyte. Further, a supporting electrolyte is added to the negative electrode electrolyte. Further, the supporting electrolyte is any one or more of sodium sulfate, potassium sulfate, sodium chloride and potassium chloride. Further, the molar concentration of the supporting electrolyte is 1-2 mol/L. Compared with the prior art, the invention has the following advantages: 1. the polysubstituted pyridinium derivative disclosed by the application has excellent redox reversibility and electrochemical stability, can endow the corresponding aqueous organic flow battery with long cycle life and low energy attenuation, still maintains stable electrochemical performance after 3000 cycles, and has an average capacity attenuation speed of 0.00013%/cycle (0.0025%/d). 2. The negative electrode active material adopts polysubstituted pyridinium derivatives, belongs to redox active small molecules, and is easy to synthesize and modify. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. FIG. 1 is a synthetic scheme of a negative electrode electrolyte polysubstituted pyridinium derivative according to the present application; FIG. 2 is a 1 H NMR chart of compound 1; FIG. 3 is a cyclic voltammogram of Compound 1; FIG. 4 is a 1 H NMR chart of compound 2; FIG. 5 is a cyclic voltammogram of Compound 2;