Laser synthesis method of LaGaO3 based solid electrolyte

A solid electrolyte, lanthanum gallate-based technology, which is applied in the field of laser synthesis for preparing lanthanum gallate-based solid electrolytes, can solve the problems of high preparation cost, difficulty, difficulty in sintering and densification, etc., and achieves simple reaction process, large-scale, The effect of excellent electrical properties

Inactive Publication Date: 2010-04-07
ZHENGZHOU UNIV
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Problems solved by technology

The synthesis of solid electrolyte materials by the solid-state reaction method requires a long enough time (2-3 days) at a very high sintering temperature (about 1550 ° C) to completely form a phase, and the synthesized samples have disadvantages such as large particles and difficulty in sintering and densification.
The wet chemical method can effectively reduce the phase formation temperature of the electrolyte material, but it is difficult to control the preparation conditions, prone to segregation of metal ions and unsuitable for large-scale production. Narrow, so a slight deviation from the stoichiometric ratio will cause the generation of a second phase, so it is quite difficult to prepare a pure LSGM phase
In general, it is very difficult to obtain high-purity LSGM solid electrolytes by either the traditional high-temperature solid-state reaction method or the liquid-phase method, and it takes a long time and the preparation cost is high.

Method used

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  • Laser synthesis method of LaGaO3 based solid electrolyte
  • Laser synthesis method of LaGaO3 based solid electrolyte
  • Laser synthesis method of LaGaO3 based solid electrolyte

Examples

Experimental program
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Embodiment 1

[0026] Example 1: The laser wavelength is fixed at 10.6 μm, the beam scanning speed is 1 mm / s, and the power density is 1.0 kW / cm 2 La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ (x=0.1, y=0.2) solid electrolyte:

[0027] La before weighing 2 o 3 , Ga 2 o 3 and MgO in a furnace at 1000°C for 7 hours to decompose carbonates and hydroxides, and dry the rest of the raw materials in a drying oven for 2 hours, and then the raw materials that can generate lanthanum gallate electrolytes are prepared according to La 2 o 3 , SrCO 3 , Ga 2 o 3 , MgO molar ratio 9: 2: 8: 4, ground in an agate mortar for 1 h, dried the sample in a drying oven for 2 h, and pressed it into strips with a hydraulic press. The size of the strips is 40 mm long, 5 mm wide, and thick 5mm, put the pressed strip into a weighing bottle and cover it to avoid water absorption and pulverization, and finally sinter it with a laser. During the sintering process, the laser wavelength is fixed at 10.6μm, the beam scanning...

Embodiment 2

[0028] Embodiment 2: The difference from Embodiment 1 is that the power density is 1.1kW / cm 2 , forming La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ For the corresponding X-ray diffraction phase analysis see figure 2 , figure 2 The XRD results showed the formation of pure La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ Mutually. Using a scanning electron microscope to observe La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ The microstructure of the product La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ The SEM picture is as follows Figure 15 As shown, it can be seen that the prepared La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ It has a regular structure, dense organization, and the grain size is about 5-10 μm; the conductivity of the product is tested by the method of AC impedance spectroscopy with a conductivity tester, and the product La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ The conductivity varies with temperature see Figure 16 , it can be seen that the conductivity reaches 0.134S / cm at 800°C.

Embodiment 3

[0029] Embodiment 3: The difference from Embodiment 1 is that the power density is 1.2kW / cm 2 , forming La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ For the corresponding X-ray diffraction phase analysis see image 3 , image 3 The XRD results showed the formation of pure La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 o 3-δ Mutually.

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Abstract

The invention discloses a laser synthesis method of LaGaO3 based solid electrolyte. Laser beams are utilized for direct heating to generate the material components of LaGaO3 based solid electrolyte, and the raw materials react in a laser molten pool to generate electrolyte and then is cooled down and solidified. In the invention, a laser sintering rapid synthesis method is utilized to prepare the LaGaO3 based solid electrolyte, the reaction process is simple, the sintering speed is high, tens of grams of samples can be sintered completely in a few seconds, high temperature formed by the high energy of laser beams causes the raw materials to react under a melting state, the reaction of raw materials is very adequate, products manufactured by the laser sintering method has high purity, cooling and solidification are carried out after reaction, therefore, produced products have very high density, and the electrical behavior is very superior.

Description

technical field [0001] The invention belongs to the technical field of solid oxide fuel cells, and in particular provides a laser synthesis method for preparing lanthanum gallate-based solid electrolytes. Background technique [0002] Solid oxide fuel cell has the characteristics of high conversion efficiency, less environmental pollution, and abundant fuel sources. It is considered to be the preferred clean and efficient power generation technology in the 21st century. In terms of performance, life and cost, it has not yet met the requirements of commercial application, and there are some unresolved problems, such as difficult selection of materials, complicated preparation process, and high cost. At present, the high-temperature solid oxide fuel cell system using yttria-stabilized zirconia (YSZ) as the electrolyte is widely used. Due to the low ion conductivity of YSZ, it needs to operate at a high temperature of about 800-1000 ° C, which increases The difficulty in the s...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M8/10H01M8/1246
CPCY02E60/521Y02E60/50Y02P70/50
Inventor 梁二军张洁郁红军晁明举
Owner ZHENGZHOU UNIV
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