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Preparation method of inorganic sulfide electrolyte

An inorganic sulfide and electrolyte technology, applied in the field of electrolytes, can solve the problems of industrial application limitations, high raw material prices, and low ion conductivity, and achieve the effects of abundant reserves, low raw material costs, and high energy density

Inactive Publication Date: 2017-09-22
HARBIN INST OF TECH WUXI RES INST OF NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main problem of solid-state electrolytes is that the ionic conductivity is too low. Therefore, finding a solid-state electrolyte with high ionic conductivity has become the key to the production of all-solid-state lithium-ion batteries. At present, Japanese scientist Yuki Kato [1] Li prepared by et al. 9.54 Si 1.74 P 1.44 S 11 .7Cl 0.3 , has a high ionic conductivity, and this kind of electrolyte is the same as the Li 10 GeP 2 S 12 It is the same configuration electrolyte, the same body-centered structure, with three-dimensional ion transport channels
However, due to the high price of raw materials used in these two electrolytes, industrial applications are limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh Li separately 2 S 0.3891g, P 2 S 5 0.2932g, S 0.2048g, Si 0.0896g, LiCl 0.0234g, take CrO 2 There are 33 small balls and 3 large balls with a total mass of 40g to achieve a ball-to-material ratio of 40:1. Put the raw materials together with the balls into the ball mill jar, seal it and take it out, and ball mill it at a speed of 370r / min for 40 hours, wherein every 50 minutes of work, the ball mill stops cooling for 10 minutes.

[0032] After the above raw materials are fully ball-milled, take them out of the glove box, seal them into a sealed container, evacuate to keep the pressure in the container below 10Pa, put them in a tube furnace, and adjust the temperature control program to a heating rate of 10°C / min. Raise the temperature to 475°C, keep the temperature for 8h, and cool down to room temperature naturally. The sintered sample was taken out in the glove box, added to the mold, put into a vacuum bag, taken out, and pressed at a pressure of 300 MPa for...

Embodiment 2

[0035] Weigh Li separately 2 S 0.3891g, P 2 S 50.2932g, S 0.2048g, Si 0.0896g, LiCl 0.0234g, take CrO 2 There are 33 small balls and 3 large balls with a total mass of 40g to achieve a ball-to-material ratio of 40:1. Put the raw materials together with the balls into the ball mill jar, seal it, take it out, and ball mill it at a speed of 360r / min for 35 hours, wherein the ball mill stops cooling for 10 minutes every 60 minutes of work.

[0036] After the above raw materials are fully ball-milled, take them out of the glove box, seal them into a sealed container, evacuate to keep the pressure in the container below 10Pa, put them in a tube furnace, and adjust the temperature control program to a heating rate of 8°C / min. Raise the temperature to 470°C, keep the temperature for 8h, and cool down to room temperature naturally. Take out the sintered sample in the glove box, put it into the mold, put it into a vacuum bag, take it out, and press it under a pressure of 150MPa for ...

Embodiment 3

[0039] Weigh Li separately 2 S 3.891g, P 2 S 5 2.932g, S 2.048g, Si 0.896g, LiCl 0.234g, take CrO 2 There are 330 small balls and 30 large balls with a total mass of 400g to achieve a ball-to-material ratio of 40:1. Put the raw materials together with the balls into the ball mill jar, seal it and take it out, and ball mill it at a speed of 380r / min for 45 hours, wherein every 55 minutes of work, the ball mill stops cooling for 10 minutes.

[0040] After the above raw materials are fully ball-milled, take them out from the glove box, seal them into a sealed container, evacuate to keep the pressure in the container below 10Pa, put them in a tube furnace, and adjust the temperature control program to a heating rate of 12°C / min. Raise the temperature to 480°C, keep the temperature for 8h, and cool down to room temperature naturally. Take out the sintered sample in the glove box, put it into the mold, put it into a vacuum bag, take it out, and press it under a pressure of 200M...

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Abstract

The invention discloses a preparation method of an inorganic sulfide electrolyte. The inorganic sulfide electrolyte is Li<9.54>Si<1.74>P<1.44>S<11.7>C<10.3> and is prepared by taking Si, S, Li<2>S, P<2>S<5> and LiCl as raw materials and performing mixing, ball-milling and sintering. The electrolyte prepared by the method is in a solid state, is good in safety and has ion conductivity equivalent to that of a liquid electrolyte; and moreover, the raw materials used in the electrolyte are low in cost, and industrial application on a large scale can be expected.

Description

technical field [0001] The invention relates to the field of electrolytes, in particular to a method for preparing an inorganic sulfide electrolyte. Background technique [0002] Lithium-ion secondary battery is currently the battery system with the strongest comprehensive performance. It has the advantages of high working voltage, high specific power and specific energy, good cycle performance, no memory effect, and environmental friendliness. It is widely used in notebook computers, mobile communications, digital Portable electronic devices such as video cameras. In recent years, with the rise of the electric vehicle industry and the field of large-scale energy storage, higher requirements have been placed on the performance of lithium-ion batteries. Not only do lithium-ion batteries need to have high energy density and power density, but they also need to have high safety performance. , Long service life and so on. However, the current liquid lithium-ion batteries canno...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0562
CPCH01M10/0525H01M10/0562H01M2300/0068Y02E60/10
Inventor 白永平白杨孟令辉陈国荣赵彦彪李卫东席丹殷晓芬
Owner HARBIN INST OF TECH WUXI RES INST OF NEW MATERIALS
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