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Photoelectrochemical energy storage battery

An energy storage battery and photoelectrochemical technology, applied in solar cells, electrochemical generators, circuits, etc., can solve the problems of inability to realize direct conversion and storage of solar energy, high price, and increased battery cost

Pending Publication Date: 2021-09-07
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Guo et al. proposed a new integrated power system based on dye-sensitized solar cells and lithium-ion batteries, but the overall discharge capacity of the batteries was low, only 38.89 μA h (Nano letters, 2012, 12(5): 2520-2523. )
In addition, due to the low voltage of solar photovoltaic cells, a single photovoltaic cell cannot directly charge a secondary battery, and it is often necessary to connect several solar cells in series to meet the charging voltage of a lithium-ion battery, which increases the cost of the battery system. bulk and reduced portability
Chinese patent 110676338A discloses a design of a light-rechargeable secondary battery. The battery system uses a semiconductor as a photoelectrode built into the secondary battery system. This design structure is relatively simple, with solid sulfur or polysulfide ion solution as the positive electrode, lithium The metal is used as the negative electrode. Under the condition of light, the charging voltage of the battery drops from the original 2.48V to 1.87V. The photovoltage provided by the visible light electrode does not match the working voltage of the secondary battery, and only a part of the charging voltage can be provided.
The existing photo-rechargeable secondary battery system mainly has the following problems: the matching of the working voltage between the photovoltaic cell and the secondary battery is poor, and the direct conversion and storage of solar energy cannot be realized.
The constructed photorechargeable secondary battery system only relies on a single photoelectrode to absorb light to provide the driving force for charging, so it is important to consider the matching of the solar cell and the secondary battery in terms of operating voltage and operating current; the materials in the battery system High battery cost due to high price, such as the use of organic electrolyte and metal lithium; the discharge capacity is low, which is far from meeting the demand for mass storage of solar energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The photoanode is titanium dioxide.

[0042] The ion exchange membrane is a cation-permeable membrane (Nafion membrane), which only allows cations to pass through.

[0043] The counter electrode is metal platinum sheet.

[0044] The positive electrode is carbon paper;

[0045] The negative electrode is carbon paper.

[0046] The positive electrode electrolyte is a mixture of iodine active material, the first auxiliary electrolyte and water, the first auxiliary electrolyte is potassium chloride, the concentration of the first auxiliary electrolyte in the positive electrode electrolyte is 1mol / L, the iodine active material is potassium iodide, and the positive electrode electrolyte The concentration of iodide ion in the iodine active substance is 0.5mol / L.

[0047] The negative electrode electrolyte is a mixture of iron ion coordination compound active material, the second auxiliary electrolyte and water, the second auxiliary electrolyte is potassium chloride, the conc...

Embodiment 2

[0050] The photoanode is dye-sensitized titanium dioxide.

[0051] The ion exchange membrane is a cation-permeable membrane (Nafion membrane), which only allows cations to pass through.

[0052] The counter electrode is metal platinum sheet.

[0053] The positive electrode is carbon paper;

[0054] The negative electrode is carbon paper.

[0055]The positive electrode electrolyte is a mixture of iodine active material, the first auxiliary electrolyte and water, the first auxiliary electrolyte is potassium chloride, the concentration of the first auxiliary electrolyte in the positive electrode electrolyte is 2mol / L, the iodine active material is potassium iodide, and the positive electrode electrolyte The concentration of iodide ion in the iodine active substance is 0.3mol / L.

[0056] The negative electrode electrolyte is a mixture of iron ion coordination compound active material, the second auxiliary electrolyte and water, the second auxiliary electrolyte is potassium chlo...

Embodiment 3

[0059] The photoanode is ferric oxide.

[0060] The ion exchange membrane is a cation-permeable membrane (Nafion membrane), which only allows cations to pass through.

[0061] The counter electrode is metal platinum sheet.

[0062] The positive electrode is carbon paper;

[0063] The negative electrode is carbon paper.

[0064] The positive electrode electrolyte is a mixture of iodine active substance, the first auxiliary electrolyte and water, the first auxiliary electrolyte is potassium chloride, the concentration of the first auxiliary electrolyte in the positive electrode electrolyte is 3mol / L, the iodine active substance is potassium iodide, and the positive electrode electrolyte The concentration of iodide ion in the iodine active substance is 0.5mol / L.

[0065] The negative electrode electrolyte is a mixture of iron ion coordination compound active material, the second auxiliary electrolyte and water, the second auxiliary electrolyte is potassium chloride, the concen...

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Abstract

The invention discloses a photoelectrochemical energy storage battery which comprises a positive electrode, a photo-anode, a positive electrode electrolyte, a negative electrode electrolyte, a negative electrode, a counter electrode and an ion exchange membrane, wherein the ion exchange membrane is used for separating the positive electrode electrolyte and the negative electrode electrolyte, the positive electrode and the photo-anode share the same positive electrode electrolyte, and the negative electrode and the counter electrode share the same negative electrode electrolyte. Cheap iron and iodine elements are used as active substances, so that the cost of the battery is remarkably reduced, and the use safety of the battery is improved by the water-phase electrolyte; due to the addition of the ligand, the oxidation-reduction potential of iron ions is adjusted, so that the working voltage of the flow battery can be matched with the working voltage of a solar battery, and the direct conversion and storage of solar energy are realized without external bias voltage; and the discharging time of the constructed photoelectrochemical energy storage battery under relatively high current density can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of photoelectrochemical energy storage batteries, and in particular relates to a photoelectrochemical energy storage battery. Background technique [0002] Solar energy is inexhaustible and is considered to be the most effective alternative to fossil energy. However, the use of solar energy is restricted by environmental factors such as day and night, weather changes, etc., and the conversion of solar energy into convenient electrical energy has attracted extensive attention of researchers. Using an external circuit to connect a solar cell to a lithium battery is a simple and direct way to utilize solar energy, and it has been intensively reported by research groups at home and abroad in recent years (Nat.Commun.6, 8103, (2015).Adv.EnergyMater. 7, 1602105, (2017).). However, in this energy storage system, it is necessary to focus on the matching of the solar cell and the secondary battery in terms of opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M14/00
CPCH01M14/005
Inventor 袁志好靳慧洁柏冲
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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