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Na fast-ion conductor Na3PSe4 and preparation method thereof

An ion conductor and ion conduction technology, applied in the field of new energy materials, to achieve the effect of increasing ion conductivity, high ion conductivity, and stable performance

Inactive Publication Date: 2015-09-09
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the sodium sulfide solid electrolyte with the highest performance at room temperature is Na 3 P.S. 4 –Na 4 SiS 4 composite material, although its ionic conductivity reaches 7.4×10 -4 S / cm (RSC Adv., 4 (2014) 17120), but still lower than the 1×10 that is considered practical -3 S / cm

Method used

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  • Na fast-ion conductor Na3PSe4 and preparation method thereof
  • Na fast-ion conductor Na3PSe4 and preparation method thereof
  • Na fast-ion conductor Na3PSe4 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Elemental Na (>99%), P (red phosphorus, 99.999%), Se (99.999%) were weighed in the glove box according to the molar ratio Na:P:Se=3:1:4, and put into an alumina crucible After that, put the crucible into a quartz tube with one end closed, evacuate to 0.1Pa, and seal the quartz tube. Put the sealed quartz tube after firing into a muffle furnace, heat it up to 850°C at a heating rate of 0.2°C / min, keep it warm for 24 hours, and finally cool it down to room temperature in the furnace. The cooled mass was removed from the quartz tube and ground into a powder manually with a mortar in a glove box.

[0021] After the sample powder is sealed with a polyimide film, X-ray diffraction (XRD) test is carried out. The test adopts SmartLab (40kV, 40mA, Cu Ka, ), the test range is 5~75°, and the rate is 3° / min. Such as figure 1 As shown, the curve is Na 3 PSe 4 The X-ray diffraction pattern of the sodium solid electrolyte, showing that the prepared sample is a pure cubic phase o...

Embodiment 2

[0025] Elemental Na (>99%), P (red phosphorus, 99.999%), Se (99.999%) were weighed in the glove box according to the molar ratio Na:P:Se=3:1:4, and put into an alumina crucible , put the crucible into a quartz tube with one end closed, evacuate to 0.1Pa, and sinter the quartz tube. Then put the sealed quartz tube after firing into a muffle furnace, heat it up to 850°C at a heating rate of 0.2°C / min, keep it warm for 24 hours, and finally take out the oil and cool it to room temperature. The cooled block is taken out from the quartz tube and put into a ball mill for ball milling. The rotating speed of the ball mill is 160 rpm, and the ball milling time is 6 hours. The ball mill jar and the balls are preferably stainless steel, and the ball mill is carried out under the protection of high-purity argon (99.999%). Adopt the X-ray diffraction test method test described in embodiment 1 to test, as Figure 4 As shown, the curve shows that the as-prepared sample is a pure cubic phas...

Embodiment 3

[0029] Elemental Na (>99%), P (red phosphorus, 99.999%), Se (99.999%) were weighed in the glove box according to the molar ratio Na:P:Se=3:1.1:4.1, and put into a zirconia crucible Put the crucible into a quartz tube with one end closed, evacuate to 0.1Pa, and seal the quartz tube. Put the sealed quartz tube after firing into the muffle furnace, heat it up to 900°C at a rate of 0.2°C / min, keep it warm for 24 hours, and finally take it out and cool it to room temperature in the air outside the furnace. The cooled block is taken out from the quartz tube and put into a ball mill for ball milling. The rotating speed of the ball mill is 200 rpm, and the ball milling time is 4 hours. The ball mill jar and the balls are preferably stainless steel, and the ball mill is carried out under the protection of high-purity argon (99.999%). The prepared sample was tested by X-ray diffraction as pure cubic Na 3 PSe 4 . Adopt the AC impedance test method described in embodiment 2, draw its ...

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Abstract

The invention relates to a Na fast-ion conductor Na3PSe4 which is a conductor with a cubic phase structure and has a high ion conducting characteristic, and the preparation method of Na3PSe4 is as follows: weighing the original material, such as Na, P, and Se in a glove box, then putting to a crucible, then putting into a quartz tube to vacuum seal, fusing in a muffle furnace, at last cooling to room temperature, forming into blocks, making into powder. The preparation technology of the invention is simple, the Na ionic conductivity of the prepared Na3PSe4 solid electrolyte is more than 1ms / cm at most, and the performance of the Na3PSe4 is the highest in the sulfur compound at present.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to a sodium fast ion conductor Na 3 PSe 4 and its preparation method. Background technique [0002] With the large-scale promotion and use of green energy, energy storage technology has been regarded as an important part of the grid operation process (Grid Technology, 32 (2008) 1). In addition, the development of pure electric vehicles also requires large-scale energy storage batteries with high performance. Lithium-ion batteries have unique advantages such as light weight, high specific energy, and no memory, and have been widely used in energy storage devices in recent years. However, with the rapid expansion of the market demand for lithium batteries, limited lithium resources will face a shortage problem, leading to an increase in the manufacturing cost of batteries. Compared with lithium, sodium has the advantages of low price and abundant resources, and its working mech...

Claims

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Application Information

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IPC IPC(8): H01M10/0562
CPCH01M10/0562Y02E60/10
Inventor 张隆杨坤董建英芦磊
Owner YANSHAN UNIV
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