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A high Seebeck coefficient aqueous thermochemical battery and device

A thermochemical and water-based technology, applied to thermoelectric devices, aqueous electrolytes, and acidic electrolytes that only use the Peltier or Seebeck effect, can solve problems such as unsatisfactory performance, low Seebeck coefficient, and low thermoelectric conversion efficiency, and achieve thermoelectric Improvement of conversion efficiency, increase of redox reaction entropy, and improvement of Seebeck coefficient

Active Publication Date: 2020-10-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the performance of the currently optimized aqueous thermochemical battery is not satisfactory, mainly reflected in the low Seebeck coefficient (-1 ), it is difficult to generate large open circuit voltage and short circuit current under the condition of limited temperature difference, that is, the thermoelectric conversion efficiency is low

Method used

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  • A high Seebeck coefficient aqueous thermochemical battery and device
  • A high Seebeck coefficient aqueous thermochemical battery and device
  • A high Seebeck coefficient aqueous thermochemical battery and device

Examples

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preparation example Construction

[0031] In some embodiments, the preparation method of the aqueous electrolyte includes the following steps:

[0032] (1) Prepare an aqueous redox solution at 20-30°C. Among them, the oxidized and reduced components have equimolar concentrations, and the concentration of the oxidized or reduced components is 0.1 to 2 mol L -1 .

[0033] (2) Add one or more of the above organic small molecule additives to the redox solution obtained in step (1) under stirring conditions to obtain a high Seebeck coefficient aqueous electrolyte.

[0034] The present invention also provides a water system thermochemical battery, which includes the water system electrolyte. Other components in the thermochemical battery can be conventional components. By using the aqueous electrolyte, an aqueous thermochemical battery with a high Seebeck coefficient can be prepared.

[0035]The invention also provides a large-area thermochemical battery device, which includes several single cells integrated in s...

Embodiment 1

[0045] The preparation method of the aqueous thermochemical battery provided in Example 1 comprises the following steps:

[0046] (1) Prepare 50mL 0.4mol L at 25°C -1 K 3 Fe(CN) 6 / K 4 Fe(CN) 6 Clarify the aqueous electrolyte for later use.

[0047] (2) Take 2 mL of the above solution and add 4 g of urea, and fully stir for 30 min at a speed of 600 rpm.

[0048] (3) Add urea and urea-free K 3 Fe(CN) 6 / K 4 Fe(CN) 6 The water-based electrolyte is poured into two polytetrafluoroethylene square tanks, and the upper and lower ends are sealed with two graphite sheet electrodes to obtain a water-based thermochemical battery.

[0049] figure 1 Shown is the comparison of the performance of the aqueous thermochemical battery prepared in Example 1 with and without urea addition. Under the same temperature difference, the thermochemical cell after adding urea can generate a larger open circuit voltage. The temperature difference has a linear relationship with the open circuit...

Embodiment 2

[0051] The method for preparing an aqueous thermochemical battery provided in Example 2 comprises the following steps:

[0052] (1) Prepare 50mL 0.1mol L at 25℃ -1 KI / KI 3 Clarify the aqueous electrolyte for later use.

[0053] (2) Take 2 mL of the above solution and add 0.5 g of guanidine hydrochloride, and fully stir at a speed of 600 rpm for 10 min.

[0054] (3) Add KI / KI with guanidine hydrochloride and guanidine hydrochloride 3 The water-based electrolyte is respectively poured into two phenolic resin square tanks, and the upper and lower ends are sealed with two graphite felt electrodes to obtain a water-based thermochemical battery.

[0055] figure 2 Shown is the comparison of the performance of the aqueous thermochemical cells prepared in Example 2 with and without the addition of guanidine hydrochloride. Under the same temperature difference, the thermochemical cell after adding guanidine hydrochloride can generate a larger open circuit voltage. The temperature...

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Abstract

The invention belongs to the technical field of new energy, and more specifically relates to a high Seebeck coefficient water system thermochemical battery and a device. The water-based electrolyte of the water-based thermochemical battery includes a redox pair aqueous solution and an organic small molecule additive, and the organic small molecule additive is dispersed in the redox pair aqueous solution; the organic small molecule additive is a guanidinium salt derivative and / or Amino derivatives, high Seebeck coefficient electrolytes are obtained by adding one or more of the above-mentioned small organic molecules to the redox couple aqueous solution. Changing the type and concentration of small organic molecules can regulate the Seebeck coefficient and output performance of the aqueous thermochemical battery.

Description

technical field [0001] The invention belongs to the technical field of new energy, and more specifically relates to a high Seebeck coefficient water system thermochemical battery and a device. Background technique [0002] With the continuous reduction of fossil fuels and the multiple pressures of environmental pollution and climate warming, finding and developing new renewable clean energy has become the focus of the energy field. Low-grade thermal energy (100<℃) is a kind of renewable energy supply with huge reserves (about 1000 MWh / year), which widely exists in the human environment and industrial and agricultural production processes, including factory waste heat, geothermal, solar thermal , body heat, etc. However, due to expensive recovery costs and low energy conversion efficiency, low-grade thermal energy can only be discarded eventually. Therefore, the development of low-cost, high-efficiency and low-quality heat recovery technology and related material researc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M6/36H01L35/28
CPCH01M6/36H01M2300/0005H10N10/10
Inventor 周军段将将余帛阳李嘉
Owner HUAZHONG UNIV OF SCI & TECH
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