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Air-stable sulfide sodium ion solid electrolyte and preparation method thereof

A solid electrolyte, sodium ion technology, applied in solid electrolyte, electrolyte battery manufacturing, non-aqueous electrolyte and other directions, can solve the problems of solid electrolyte failure, sensitivity, and restrict the application of sulfide solid electrolyte, and achieve the effect of increasing the cost of making batteries

Active Publication Date: 2018-08-10
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an air-stable sodium sulfide ion solid electrolyte and a preparation method thereof, thereby solving the problem that the sulfide solid electrolyte in the prior art is sensitive to air and exposed to air It is easy to generate sulfide hydrogen and lead to the failure of solid electrolyte, which limits the application of sulfide solid electrolyte and increases the technical problems of making batteries

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  • Air-stable sulfide sodium ion solid electrolyte and preparation method thereof
  • Air-stable sulfide sodium ion solid electrolyte and preparation method thereof
  • Air-stable sulfide sodium ion solid electrolyte and preparation method thereof

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preparation example Construction

[0033] The preparation method of above-mentioned cubic phase sulfide is: Na 2 S, Na 2 O, SnS 2 ,P 2 S 5 、As 2 S 5 , Sb 2 S 5 Take Na 4-x sn 1- x m x S 4-y o y The molar ratio within is weighed under an inert atmosphere, and mixed uniformly, and then calcined at 400°C to 650°C for 8h to 24h under a vacuum degree of less than 100Pa, so as to prevent the reactants from reacting with oxygen or moisture in the air to form impurities;

[0034] In the Na-Sn-M-S-O system, there are crystal phases of various structures, and uniform mixing is very important. Uneven mixing causes inconsistencies in components and is prone to impurities; at the same time, the mixing process is also accompanied by the fineness of raw materials. The chemical process is beneficial to the synthesis of sulfide electrolyte in the later stage; the method of uniform mixing can choose mechanical grinding methods such as vibration mill, turbo mill, ball mill; for example, when mixing by ball mill metho...

Embodiment 1

[0037] Na in an argon-protected glove box 2 S, Sb 2 S 5 , SnS 2 Take Na 3.7 sn 0.7 Sb 0.3 S 4 The mol ratio is weighed and mixed as raw materials;

[0038] Put the raw materials and zirconia balls into a zirconia-substrate ball mill tank with a capacity of 100, seal the container, perform ball mill mixing at a speed of 350 r / min, and obtain a mixed powder after 15 hours;

[0039] Put the mixed powder in the glove box, take it out, and form it under 150MPa pressure in a powder tablet press, put it into a glass / quartz tube, evacuate it until the vacuum degree is less than 100Pa, seal it, and put it into a muffle furnace. The temperature rise rate of the muffle furnace is 100°C / hour, and then the solid phase reaction is carried out at 550°C for 24 hours, and the temperature is naturally cooled to obtain the product Na 4-x sn 1-x MxS 4-y o y , in this example, the product is Na 3.7 sn 0.7 Sb 0.3 S 4 .

[0040] In the glove box, the product was taken out from the se...

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Abstract

The invention discloses an air-stable sulfide sodium ion solid electrolyte and a preparation method thereof. The chemical formula of the sulfide sodium ion solid electrolyte is Na4xSn1xMxS4yOy, wherein M is at least one of P, As and Sb, x is more than or equal to 0.05 and less than or equal to 0.5, and y is more than or equal to 0 and less than or equal to 0.5. The crystal structure of the sulfidesodium ion solid electrolyte has an I41 / acd space group, the isolated [Sn / M]4 tetrahedron constitutes a skeleton, and sodium ions fill five unfilled crystal positions. The sulfide sodium ion solid electrolyte is used for preparing an all solid-state battery. The solid electrolyte material has high ionic conductivity and is stable in air, thereby solving the technical problems that the sulfide solid electrolyte is sensitive to air, easily generates sulfide hydrogen when being exposed to air and causes failure of the solid electrolyte at the same time so as to limit the application of the sulfide solid electrolyte and increase the manufacturing cost of batteries in the prior art.

Description

technical field [0001] The invention belongs to the field of all-solid-state sodium-ion batteries, and more specifically relates to an air-stable sulfide sodium-ion solid electrolyte and a preparation method thereof. Background technique [0002] At present, electrochemical energy storage technology is one of the most promising technologies for industrialization among many energy storage technologies due to its advantages of simplicity, high efficiency, and installation without site restrictions. Among them, lithium-ion batteries have high energy density, long cycle life, high working voltage, no memory effect, small self-discharge, relatively mature development, and are the most widely used electrochemical energy storage technology. It has a dominant advantage and is regarded as the main choice for large-scale energy storage power stations. However, the cost of lithium-ion batteries is relatively high, and the global resource reserves are limited, so it is impossible to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/058
CPCH01M10/0562H01M10/058H01M2300/0068Y02E60/10Y02P70/50
Inventor 谢佳孙玉龙贾欢欢彭林峰
Owner HUAZHONG UNIV OF SCI & TECH
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