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Acid single flow cell

A flow battery, single-liquid technology, applied in the field of acid single-liquid flow battery, can solve the problems of deposition of sulfur in the diaphragm, occupying volume and weight, cross-contamination, etc., to reduce charging voltage, improve energy efficiency, and reduce concentration polarization. Effect

Inactive Publication Date: 2009-10-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cathode Fe 3+ / Fe 2+ The half-cell has good reversibility and fast kinetic characteristics, but Ti as the negative electrode 4+ / Ti 3+ Half-cell reaction speed is slow, easy to form TiO 2 Passivation layer; Cr as negative electrode 3+ / Cr 2+ When the half-cell is charged, hydrogen is easy to evolve, and Cr(III) ions are easy to form inner complex ions. These complex ions are relatively inert and reduce the Cr 3+ / Cr 2+ The redox reaction rate
Moreover, both Fe-Ti and Fe-Cr system flow batteries have cross-contamination of positive and negative electrolytes.
After long-term research, the Fe-Ti and Fe-Cr system flow batteries have been improved to a certain extent, but the cross-contamination problem of the positive and negative solutions has not been solved, so the battery has not been able to be practical in the end.
The existing problems of sodium polysulfide / bromine flow battery are: (1) the properties of the positive and negative electrolytes are different, and cross-contamination between the electrolytes after a period of time; (2) deposition of sulfur on the diaphragm; (3) hydrogen sulfide and Formation, volatilization and strong corrosion of bromine
[0008] However, there are three major disadvantages in the above two types of relatively mature flow battery systems: expensive ion exchange membranes must be used; it is difficult to suppress cross-contamination of positive and negative electrolytes; low energy
However, due to the continuous rise in the price of nickel, the positive electrode material used in the battery, it is currently more than 200,000 yuan / ton, which increases the cost.
On the other hand, in order to improve the solubility of zinc in the electrolyte, alkaline zinc-nickel single-flow batteries must use high-concentration KOH or NaOH solutions, and the cycle performance of the positive nickel hydroxide will decline rapidly in high-concentration lye.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1-3 is such as figure 1 A single acidic single flow battery is shown.

[0037] After mixing 30 grams of lead sulfate plus 5 grams of 20% sulfuric acid solution, apply it on 4*6cm 2 On the lead-calcium alloy (containing 0.4% of calcium) plate frame, the lead dioxide electrode plate that the rated capacity is 2000mAh is obtained through pre-charge formation. With 4*6cm 2 The titanium-based gold-plated electrode is the negative current collector, 500ml2MH 2 SO 4 -0.5MIN 2 (SO 4 ) 3 The solution is an electrolyte. The HB-2B peristaltic pump is used as the power pump, and the electrolyte is circulated at a speed of 220ml / h. The electromotive force of the battery is 2.11V, the average discharge voltage is 1.65-2.05V at a discharge rate of 1000mA, and the energy efficiency of the process is 85.5%.

Embodiment 2

[0039] Add 32 grams of lead sulfate to 5 grams of 20% sulfuric acid solution and 1 gram of Pb 3 o 4 After mixing evenly, apply on 4*6cm 2 On the lead alloy plate frame containing 1.2% antimony, the lead dioxide plate with a rated capacity of 2200mAh is obtained through pre-charging. With 4*6cm 2 The graphite electrode is the negative current collector, 500ml2.5MH 2 SO 4 -0.1M H 3 PO 4 -0.65MCdSO 4 The solution is an electrolyte. The HL-2B peristaltic pump is used as the power pump, and the electrolyte is circulated at a speed of 270ml / h. The electromotive force of the battery is 2.055V, the average discharge voltage is 1.985V at a discharge rate of 1000mA, and the energy efficiency of the process is 90.3%.

Embodiment 3

[0041] Two lead dioxide plates with a rated capacity of 3000mAh were used as positive electrodes, which were respectively placed on both sides of the negative electrode collector. With 5*8cm 2 The double-sided silver-plated stainless steel electrode is the negative current collector, 500ml2.5MH 2 SO 4 -0.1M HClO 4 -0.65MCdSO 4 The solution is an electrolyte, and 0.5 g / L of ammonium triacetate is added to the electrolyte. The MP-10RN magnetic circulation pump is used as the infusion pump, and the electrolyte is circulated at a flow rate of 500ml / h. The electromotive force of the battery is 2.11V, the average discharge voltage is 1.9V at a discharge rate of 3000mA, and the energy efficiency of the process is 87.5%.

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Abstract

The invention relates to an acid single flow cell which can be applied to large-scaled energy storage and power generation. The cell comprises an electrolyte storage tank, a cadmium or indium deposited cathode current collector and a lead dioxide anode; an acid solution of soluble cadmium salt or indium salt is used as an electrolyte; and when the cell is charged, the cadmium or indium ions are deposited on the cathode current collector from the electrolyte, and when the cell is discharged, the metal cadmium or indium is dissolved in the electrolyte from the cathode current collector. The current cell has the advantages of simple structure, convenient preparation, high electric energy conversion efficiency, long cycle life, environmental protection, safe use, and the like.

Description

Technical field: [0001] The invention relates to an acidic single flow battery which can be used for large-scale energy storage and power generation. Background technique: [0002] Electric energy is an important guarantee for the development of the national economy and an important foundation for the modern defense industry. The sufficient supply and efficient utilization of electric energy are of great practical significance. In order to achieve stable power supply, it is of great significance to develop efficient large-scale energy storage technology. In order to solve and improve the power supply problems in remote areas of our country, it is necessary to establish a distributed power supply system. The large-scale energy storage unit is the "power bank" of the distributed power supply system, which plays an extremely important role and is also one of the key technologies that must be effectively solved. [0003] The flow battery in the chemical storage battery, or flow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18H01M8/20H01M10/36H01M12/00
CPCY02E60/528Y02E60/128Y02E60/10Y02E60/50
Inventor 潘军青程杰孙艳芝文越华万平玉杨裕生
Owner BEIJING UNIV OF CHEM TECH
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