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Redox flow cell for storing electrical energy and use thereof
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A liquid flow battery and a technology for storing electric energy, which is applied in the field of redox flow battery pack and redox flow battery pack
Active Publication Date: 2018-06-08
JENABATTERIES GMBH
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Abstract
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However, useful current densities in redox systems are limited to less than 5 mA / cm 2 And the maximum achievable capacity is less than 10Ah / l
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Embodiment 1
[0254] Example 1: Iron / viologen redox flow battery pack
[0255] The theoretical potential of the battery (the E 0 Defined as redox potential in water at 20°C against a silver / silver chloride reference electrode):
[0256] E. 0 Fe 2+ / Fe 3+ =0.77V
[0257] E. 0 MV 2+ / MV + =-0.43V
[0258] → Battery voltage = 1.2V
[0259] Electrolyte solution was prepared by dissolving 1mol / L FeCl in the electrolyte solution of 2mol / L NaCl 2 And 1mol / L dimethyl viologen chloride composition. The substance is available in the chemical trade (Chemikalienhandel). in a 5cm 2 The active area of the redox flow battery was tested in the electrolyte solution. The charging process and the discharging process are carried out both statically (without pumping liquid) and with pumped liquid. Up to 120mW / cm can be achieved here 2 energy density. The storage capacity is 25Ah / L. A cell voltage of about 1.0 V was observed when overvoltage was taken into account.
[0267] Two electrolyte solutions were prepared: A solution for the working electrode (positive terminal of the battery) was prepared from 1.0 g of TEMPO-ammonium chloride with the following structure and 0.55 g of NaCl in 10 ml of water. A solution of the counter electrode (negative terminal of the battery) was prepared from 1.5 g dimethyl viologen chloride and 0.55 g NaCl in 10 ml water. in a 5cm 2 The solution was tested in an active area redox flow battery (similar to Example 1). Cycle the battery charge and discharge.
[0268] The structure of TEMPO-ammonium chloride:
[0269]
[0270] image 3 The OCV curve of the battery as a function of its state of charge is shown.
[0271] exist Figure 4 It is shown in , that higher potential ...
Embodiment 3
[0272] Example 3: Methyl viologen-TEMPO redox flow battery pack
[0273] Theoretical cell potential:
[0274] E. 0 MV-TEMPO 2+ / MV-TEMPO 3+ =0.68V
[0275] E. 0 MV-TEMPO 2+ / MV-TEMPO + =-0.46V
[0276] → Battery voltage = 1.14V
[0277] An electrolyte solution was prepared from 213 mg of methylviologen-TEMPO having the following structure and 235 mg of NaCl in 4 ml of water. The solution was applied to the working electrode (the positive terminal of the battery) and the counter electrode (the negative terminal of the battery) and the 2 The test was carried out in a redox flow battery with an active area (similar to Example 1, without pumping liquid). Cycle the battery charge and discharge. In addition the OCV curve is recorded.
[0278] The structure of methylviologen-TEMPO:
[0279]
[0280] exist Figure 5 The OCV curve of the battery is plotted as its state of charge (SOC) in .
[0281] Figure 6 The charge curve for this battery is shown.
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Abstract
The invention relates to a cost-effective and durable redox flow cell which uses less corrosive redox-active components. The redox flow cell includes a reaction cell having two electrode chambers forcatholyte and anolyte, each of which are connected to at least one fluid storage means, which are separated by an ion-conducting membrane, and which are provided with electrodes, wherein the electrodechambers are each filled with electrolyte solutions containing redox-active components dissolved or dispersed in an electrolyte solvent, as well as optionally containing conducting salts dissolved therein, as well as potentially further additives. The redox flow cell is characterised in that the anolyte contains a redox-active component having one to six groups of formula (I), or having one to six groups of formula (II) in the molecule, and in that the catholyte contains a redox-active component having one to six groups of formula (III) in the molecule or iron salts, or in that anolyte and catholyte contains a redox-active component having one to six groups of formula (I) or of formula (II) in combination with one to six groups of formula (III) in the molecule, wherein R1 is a covalent C-C bond or a bivalent bridge group, R2 and R3 independently represent alkyl, alkoxy, haloalkyl, cycloalkyl, aryl, aralkyl, heterocyclyl, halogen, hydroxy, amino, nitro or cyano groups, X represents a q-value inorganic or organic anion, b and c are independently whole numbers from 0 to 4, q is a whole number from 1 to 3, a is a number with the value of 2 / q, and R4, R5, R6 and R7 independently represent alkyl, cycloalkyl, aryl or aralkyl groups.
Description
technical field [0001] The present invention relates to redox flow batteries for storing electrical energy, which are also generally referred to as redox flow batteries or redox flow batteries. A redox flow battery consists of two polarity-specific chambers in which the redox-active chemical compound or the redox-active compound is present either dissolved in the electrolyte solvent or dispersed in the two chambers, respectively. , and the chamber is connected to the reservoir. In this way, two separate circuits are formed for redox-active compounds present eg dissolved in water or an organic solvent or dispersed in the electrolyte solvent, separated by the membrane between the polarity-specific chambers. Ion exchange between the two chambers takes place through the membrane. Background technique [0002] Batteries are particularly suitable for stationary storage applications, e.g. as buffer batteries for wind and solar power plants or as power and regulation reserves for ...
Claims
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