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Lithium borohydride and molybdenum disulfide composite system solid electrolyte material, and preparation method and application thereof

A solid electrolyte, lithium borohydride technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as limited applications, poor safety, and low ion selectivity

Active Publication Date: 2019-04-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although liquid electrolytes have high ionic conductivity and excellent electrode surface wettability, poor electrochemical and thermal stability, low ion selectivity, and poor safety limit their further applications.
At present, there is no report on the application of lithium borohydride and molybdenum disulfide in solid electrolytes

Method used

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  • Lithium borohydride and molybdenum disulfide composite system solid electrolyte material, and preparation method and application thereof
  • Lithium borohydride and molybdenum disulfide composite system solid electrolyte material, and preparation method and application thereof
  • Lithium borohydride and molybdenum disulfide composite system solid electrolyte material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] in the isolated air (H 2 O2 4 ball mill, then MoS 2 and ball-milled LiBH 4 According to the set molar ratio (xLiBH 4 -yMoS 2) calculate the mass, put it into a stainless steel spherical tank equipped with stainless steel grinding balls; adopt the mechanical ball milling method of a planetary wheel ball mill, under the protection of high-purity (99.9999%) inert gas (argon), to obtain xLiBH 4 -yMoS 2 composite particles. The total mass of the sample in the spherical tank is 1 g, the volume of the ball mill tank is 100 ml, the weight ratio of the grinding ball to the sample is 40:1, and the revolution speed is set to 450 revolutions per minute. LiBH 4 20 hours for ball milling alone, xLiBH 4 -yMoS 2 The mixture was ball milled for 3 hours. Take out the ball mill to obtain xLiBH 4 -yMoS 2 The mixture is then loaded into the sample cell of the Sievert type gas-solid reaction closed device for high temperature dehydrogenation reaction, the dehydrogenation temperatu...

Embodiment 2

[0033] Take out part of the xLiBH of the samples with different raw material ratios in Example 1 4 -yMoS 2 The composite particles and the material obtained after dehydrogenation were subjected to X-ray diffraction (XRD) experiments. The sample cell was covered with a specific polymer film and sealed with a glass slide with vacuum grease to prevent water and oxygen in the air from affecting the sample. effect. The target material of the X-ray source used is a Cu target, the tube voltage is 40kV, and the tube current is 40mA. The obtained XRD pattern is as figure 1 , shown in 4.

[0034] xLiBH after ball milling 4 -yMoS 2 Only pure 2H-MoS in the complex (x:y=1:1, 1:3, 1:5, 1:7, 3:1, 5:1) 2 Phase, LiBH 4 Has become an amorphous phase, so there is no peak in XRD ( figure 1 ). xLiBH 4 -yMoS 2 After high temperature dehydrogenation of the complex (x:y=1:1, 1:3, 1:5, 3:1, 5:1), a new phase was generated. From the XRD pattern ( Figure 4 ), it can be seen that LiMoS 2 , ...

Embodiment 3

[0050] Take out part of the xLiBH of the samples with different raw material ratios in Example 1 4 -yMoS 2 The composite particles were tested by Fourier transform infrared spectroscopy (FTIR). Since the experimental samples had to be isolated from the air, the whole preparation was carried out in a glove box. According to the mass ratio, sample powder: KBr powder = 1:200, mix the two powders, and grind them evenly. The prepared powder is stored in a small brown glass bottle. Before the FTIR test, the powder sample was taken out of the glass bottle, and an appropriate amount of powder was put into the tableting mold, pressed for 1 minute under the pressure of 12MPa, then released for 30 seconds, and pressed for 1 minute to obtain the tablet test sample. Test results such as figure 2 shown.

[0051] As can be seen from the figure, pure LiBH 4 The two B-H characteristic peaks in the prepared LiBH 4 -5MoS 2 is still present in the complex, as evidenced by LiBH 4 existenc...

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Abstract

The invention discloses a lithium borohydride and molybdenum disulfide composite system solid electrolyte material, and a preparation method and application thereof. The composite system solid electrolyte material is an xLiBH4-yMoS2 ball-milling compound or a high-temperature dehydrogenation reaction product thereof, wherein x is 1 to 10 and y is 1 to 10. The preparation method comprises the following steps: mixing the LiBH4 and the MoS2 according to the above molar ratio in an inert gas atmosphere and then performing ball milling, or further loading a ball-milled product into a Sievert-type gas-solid reaction closed device for a temperature-programmed dehydrogenation reaction at a dehydrogenation temperature from the room temperature to 500 degrees centigrade and at a temperature rise rate from 1-10 degrees centigrade per minute. The material of the invention is a lithium ion conductor with excellent room temperature (T < 100 degrees centigrade) performance, is about 3-4 orders of magnitude higher than LiBH4 at room temperature, and can be used for preparing a solid electrolyte of an all-solid lithium ion battery.

Description

technical field [0001] The invention belongs to a novel solid electrolyte material, in particular to a xLiBH 4 -yMoS 2 Composite solid electrolyte material, preparation method and application thereof. Background technique [0002] Current research in Li-ion batteries has focused on liquid electrolytes. Although liquid electrolytes have high ionic conductivity and excellent electrode surface wettability, poor electrochemical and thermal stability, low ionic selectivity, and poor safety limit their further applications. In recent years, it has been proposed to use solid electrolytes to replace organic liquid electrolytes, which overcomes the above problems on the one hand, and provides the possibility to develop new chemical batteries on the other hand. So far, the mainstream solid-state electrolytes developed by researchers mainly include polymer solid-state electrolytes and inorganic solid-state electrolytes. Polymer solid-state electrolytes are represented by polyoxyeth...

Claims

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Application Information

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IPC IPC(8): H01M10/0562
CPCH01M10/0562Y02E60/10
Inventor 张耀刘志祥曲翊
Owner SOUTHEAST UNIV
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