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Sodium fast ion conductor and preparation method therefor

An ionic conductor and elemental technology, used in electrical components, battery electrodes, circuits, etc., can solve the problem of low ionic conductivity at room temperature, and achieve the effects of cheap and easy-to-obtain raw materials, high repeatability, and stable performance.

Active Publication Date: 2017-03-22
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the room temperature ionic conductivity of existing inorganic sodium solid electrolytes is generally low, and the development of new high-performance sodium solid electrolytes is crucial to the popularization and application of large-scale energy storage batteries.

Method used

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  • Sodium fast ion conductor and preparation method therefor
  • Sodium fast ion conductor and preparation method therefor
  • Sodium fast ion conductor and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put 0.0916g elemental Na (>99%), 0.2078g Sb (99.999%) and 0.2007g S (99.999%) into an alumina crucible in a glove box, put the crucible into a quartz tube with one end closed, and pump Vacuum to 0.1 Pa, seal the quartz tube; then put the sealed quartz tube into the muffle furnace, heat it to 550 °C at a heating rate of 0.3 °C / min, keep it for 8 hours, and finally cool it to room temperature in the furnace. The cooled block was taken out of the quartz tube, put into a glove box and ground into powder manually with a mortar to obtain Na 7 Sb 3 S 11 Sodium fast ion conductor.

[0018] After the above-mentioned fast ion conductor is sealed with a polyimide film, X-ray diffraction (XRD) test is carried out, and the test adopts SmartLab (40kV, 40mA, Cu Ka, ), the test range is 10°~75°, the rate is 4° / min, and Na 7 Sb 3 S 11 Sodium fast ion conductor is a tetragonal phase structure.

[0019] In the glove box, the above-mentioned fast ion conductor and the indium electr...

Embodiment 2

[0021] Put 0.0917g elemental Na (>99%), 0.2078g Sb (99.999%) and 0.2005g S (99.999%) into a glassy carbon crucible in a glove box, put the crucible into a quartz tube with one end closed, and pump Vacuum to 0.1 Pa, seal the quartz tube; then put the sealed quartz tube into the muffle furnace, heat it to 700 °C at a heating rate of 0.3 °C / min, keep it for 20 hours, and finally cool it to room temperature with water. The cooled block was taken out from the quartz tube, and was ground into powder by a ball mill under the protection of high-purity argon (99.999%). The ball milling speed was 100 r / min, and the ball milling time was 10 hours. Made Na 7 Sb 3 S 11 Sodium fast ion conductor.

[0022] The above-mentioned ionic conductor is tested by the X-ray diffraction test method described in Example 1, and tested by the impedance test method described in Example 1, such as figure 2 As shown, the room temperature conductivity of the ionic conductor can be calculated from the int...

Embodiment 3

[0024] Put 0.0921g elemental Na (>99%), 0.2068g Sb (99.999%) and 0.2008g S (99.999%) into a glassy carbon crucible in a glove box, put the crucible into a quartz tube with one end closed, and pump Vacuum to 0.1Pa, seal the quartz tube; then put the sealed quartz tube into the muffle furnace, heat it to 900 °C at a heating rate of 0.3 °C / min, keep it for 15 hours, and finally cool it to room temperature. The cooled block was taken out from the quartz tube, and was ground into powder by a ball mill under the protection of high-purity argon (99.999%). The ball milling speed was 220 r / min, and the ball milling time was 4 hours. Made Na 7 Sb 3 S 11 Sodium fast ion conductor.

[0025] The above-mentioned ionic conductor is tested by the X-ray diffraction test method described in Example 1, and tested by the impedance test method described in Example 1, such as image 3 As shown, the room temperature conductivity of the ionic conductor can be calculated from the intercept of the ...

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Abstract

Disclosed is a sodium fast ion conductor. The sodium fast ion conductor comprises the chemical ingredients of Na, Sb and S at the molar ratio of (6.99-7.01) to 3 to (10.99-11.01) sequentially; the preparation method for the sodium fast ion conductor mainly comprises the steps of putting the raw materials into a crucible; putting the crucible into a quartz tube with one sealed end, vacuumizing to 0.1Pa, sintering the quartz tube, and putting into a muffle furnace, heating at the speed of 0.3 DEG C / min to 550-900 DEG C, performing temperature insulation for 8-20h, and cooling to room temperature; taking blocks out of the quartz tube, manually grinding the blocks into powder by a mortar in a glove box, or grinding the blocks by a ball mill into powder to prepare the Na<7>Sb<3>S<11> sodium fast ion conductor. The preparation method is simple in preparation process and high in repeatability; the prepared Na<7>Sb<3>S<11> sodium fast ion conductor has extremely high ionic conductivity; and the conductivity of the sodium fast ion conductor at a room temperature can be greater than 4.56*10<-3>S / cm.

Description

technical field [0001] The invention belongs to the field of new materials, in particular to a sodium fast ion conductor and a preparation method thereof. Background technique [0002] As one of the most promising technologies in chemical energy storage, batteries have received extensive attention in recent years. Ion batteries have the advantages of light weight, high specific energy, and no memory, and are widely used in small energy storage fields such as mobile phones, laptop computers, and electric bicycles; however, with the rapid expansion of market demand for lithium-ion batteries, limited lithium resources facing the problem of exhaustion. Compared with lithium, sodium has the advantages of low price (the price of sodium is one tenth of lithium), abundant resources (the fourth in reserves); and the working mechanism of sodium in secondary batteries is similar to that of lithium, so sodium is all solid As a secondary battery, batteries are well suited for decentral...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCH01M4/381Y02E60/10
Inventor 张隆张德超
Owner YANSHAN UNIV
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