Organic-inorganic composite electrolyte and preparation method thereof

A composite electrolyte and inorganic composite technology, applied in circuits, fuel cells, electrical components, etc., can solve the problems of slow electrode reaction, complex battery structure, and large energy consumption, and achieve good medium-temperature proton conductivity, simple process and operation, The effect of large output power density

Inactive Publication Date: 2018-10-23
FUYANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Fuel cells based on high-temperature (above 800°C) solid electrolyte materials have high operating temperatures, high requirements for system electrodes and connecting materials, complex battery structures, large energy consumption, and high manufacturing costs
For low-temperature (<100°C) fuel cells, although the requirements for sealing materials and connecting materials are not too high, there are more selectivity, and it is beneficial to reduce costs, etc., as the temperature rises or the water vapor in the ambient atmosphere The partial pressure decreases, and the low-temperature electrolyte material is easy to dehydrate and decompose, resulting in a decrease in fuel cell performance or even failure
At low temperatures, there are still many problems such as the catalyst of the fuel cell is easily poisoned by carbon monoxide, the electrode reaction is slow, the polarization is large, and the water and heat management of the fuel cell system is difficult.

Method used

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  • Organic-inorganic composite electrolyte and preparation method thereof
  • Organic-inorganic composite electrolyte and preparation method thereof
  • Organic-inorganic composite electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] (1) Sn 0.85 Ga 0.15 P 2 o 7 preparation of

[0068] Weigh 0.85mol of tin oxide, 0.15mol of gallium oxide and 2mol of concentrated phosphoric acid, grind and mix them, mix them evenly and heat them at 200-300°C until they become a paste, then continue stirring at 350°C until they are fully reacted and become powder, then pulverize. Ball milled for 8 hours, and the mixture was dried and sieved;

[0069] The above system was sintered at 600°C for 2h to obtain Sn 0.85 Ga 0.15 P 2 o 7 (denoted as SGPO) samples, with the single Sn 0.85 Ga 0.15 P 2 o 7 The fuel cell assembled as electrolyte has a conductivity of 8.1×10 at 300°C -3 S cm -1 , the output power density is 28.6mW·cm -2 .

[0070] (2) Preparation of composite electrolyte

[0071] Composite polyphenylene ether (PPO) dissolved in chloroform with ball-milled and sieved SGPO at a ratio of 4:1, stir for 0.5-1 hour, shake, and evaporate until viscous;

[0072] The system was laid on the surface of the sil...

Embodiment 2

[0075] The method used in this embodiment is similar to the method used in Example 1, the only difference being that the consumption of raw materials in (1) is respectively 0.95mol tin oxide, 0.05mol gallium oxide and 2mol concentrated phosphoric acid. 0.95 Ga 0.05 P 2 o 7 The fuel cell assembled as electrolyte has a conductivity of 6.7×10 at 300°C -3 S cm -1 , the output power density is 20.1mW·cm -2 .

[0076] A fuel cell assembled with the composite electrolyte prepared in this example has an electrical conductivity of 1.02×10 in a humid oxygen atmosphere at 300° C. -2 S cm -1 , the output power density is 50.3mW·cm -2 .

experiment example 1

[0078] XRD characterization of experimental example 1 sample

[0079] With the phase structure of the sample that XRD instrument test embodiment 1 makes, the result is as figure 1 As shown, among them,

[0080] Curve 1 shows the XRD collection of illustrative plates that embodiment 1 makes composite electrolyte;

[0081] Curve 2 shows SnP 2 o 7 (JCPDS 00-029-1352) standard XRD pattern;

[0082] Depend on figure 1 It can be seen that the XRD of the composite electrolyte sample prepared in Example 1 has (111), (200), (210), (211) respectively at 2θ of 19.2°, 22.2°, 25.0°, 27.4°, 31.8° and 37.4° , (220) and (311) crystal plane diffraction peaks, crystal plane index and cubic phase SnP 2 o 7 (JCPDS 00-029-1352), no new diffraction peaks were produced in the figure after compounding with polyphenylene ether (PPO), indicating that no new substance was formed after the compounding of the two, that is, gallium-doped tin pyrophosphate and poly There is no chemical reaction in...

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Abstract

The invention provides an organic-inorganic composite electrolyte. The composite electrolyte comprises doped pyrophosphate and a high temperature-resistant polymer, and has better electrical properties and a higher density than the single doped pyrophosphate, and a fuel cell assembled by using the composite electrolyte has a large output power density under a medium temperature condition. The invention also provides a method for preparing the composite electrolyte. The method comprises the following steps: mixing the doped pyrophosphate with the high temperature-resistant polymer at normal temperature, heating the obtained mixture until the mixture is viscous, and laying the viscous mixture on the surface of a mold. The method is simple to operate and is easy to realize.

Description

technical field [0001] The invention relates to the field of solid fuel cells, in particular to an organic-inorganic composite electrolyte and a preparation method thereof. Background technique [0002] A fuel cell is a device that directly converts chemical energy stored in fuels and oxidants into electrical energy. It is an efficient and clean energy source and is known as a green energy source in the 21st century. As a new type of functional material, solid electrolyte is widely used in fuel cells. [0003] Fuel cells based on high-temperature (above 800°C) solid electrolyte materials have high operating temperatures, high requirements for system electrodes and connecting materials, complex battery structures, large energy consumption, and high manufacturing costs. For low-temperature (<100°C) fuel cells, although the requirements for sealing materials and connecting materials are not too high, there are more selectivity, and it is beneficial to reduce costs, etc., as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1016H01M8/102H01M8/1023H01M8/1025
CPCH01M8/1016H01M8/102H01M8/1023H01M8/1025Y02E60/50
Inventor 王洪涛
Owner FUYANG NORMAL UNIVERSITY
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