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Sulfide solid electrolyte sheet and preparation method thereof

A technology of sulfide electrolyte and solid electrolyte, which is used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problem of low ionic conductivity and so on.

Active Publication Date: 2021-01-19
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing sulfide solid-state electrolytes still have problems such as low ionic conductivity, and the energy density and cycle performance of sulfide solid-state batteries still need to be improved.

Method used

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  • Sulfide solid electrolyte sheet and preparation method thereof
  • Sulfide solid electrolyte sheet and preparation method thereof
  • Sulfide solid electrolyte sheet and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0028]In the second aspect of the present invention, the embodiment of the present application also provides the preparation method of the above-mentioned sulfide solid electrolyte sheet, including: dispersing the sulfide electrolyte raw material in an organic solvent to form a reaction mixture; dispersing the borate ester in the organic solvent In the process, a modified solution is formed; the initial reaction mixture is mixed with the modified solution, and dried to obtain an initial product; the initial product is post-treated more than once, and each post-treatment includes grinding, cooling, pressing and sintering steps.

[0029] In the preparation method provided in the embodiments of the present application, borate is used as the doping raw material to obtain a solid electrolyte co-doped with boron and oxygen, wherein the doping of boron element can reduce the binding effect of anion on lithium ions and increase the concentration of lithium ions. The transmission abili...

Embodiment 1

[0082] The data of Examples 1-5 show the influence of the content change of boron element in the electrolyte sheet on the performance of the electrolyte sheet. When the content of boron element in the electrolyte sheet is too low (as in Example 1), the introduction of boron element has little effect on the electrolyte structure, although the conductivity of the electrolyte sheet can also be improved to a certain extent, but the effect of this improvement is not significant , and too low boron element content will lead to increased concentration test error, so the measured concentration deviation is also large. When the content of boron element in the electrolyte sheet is too high, the problem of local element enrichment is prone to occur, which is not conducive to achieving uniform modification results, and too high boron doping amount will reduce the relative concentration of lithium ions in the electrolyte sheet. Therefore, it is not conducive to improving the conductivity a...

Embodiment 3

[0083] The data of Examples 3 and 6 show the influence of the number of post-treatments on the performance of the electrolyte sheet. It can be seen from Table 1 that the performance of Example 6 is better than that of Example 3. This is because, as the number of post-treatments increases, the doped electrolyte material undergoes multiple grinding, briquetting and sintering. The distribution of various elements in the bulk material tends to be uniform, and the surface roughness and interface resistance are reduced. However, too many times of high-temperature sintering may also cause structural phase changes in the electrolyte, which will affect the increase in conductivity. Therefore, in the embodiment of the present application, the number of post-treatments should be more than 1 time, preferably 2-3 times.

[0084] Examples 6-12 take three post-treatments as an example to illustrate the technical effects produced by the gradient increase of the sintering temperature as the n...

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Abstract

The invention provides a sulfide solid electrolyte sheet and a preparation method thereof. The invention provides a sulfide solid electrolyte sheet which comprises a sulfide electrolyte material and aboron element doped in the sulfide electrolyte material, and the relative deviation (B0B100) / B0 between the mass concentration B0 of the boron element at any position on the surface of the electrolyte sheet and the mass concentration B100 of the boron element at a position 100 [mu] m away from the position does not exceed 20%. In the sulfide solid electrolyte sheet disclosed in the application, the boron element introduced into the sulfide solid electrolyte can effectively reduce the binding effect of anions on lithium ions, and improve the transmission capacity of the lithium ions; the boronelement is uniformly distributed in the sulfide solid electrolyte, the doping uniformity and the conductivity of the solid electrolyte are improved, and the surface roughness of the solid electrolytesheet is remarkably improved, so that the diffusion process of lithium ions in the sulfide solid electrolyte sheet and a lithium metal anode interface is facilitated, the interface impedance is reduced, and the cycle performance of the battery is improved.

Description

technical field [0001] The present application relates to the field of batteries, in particular to a sulfide solid electrolyte sheet and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of consumer electronics and electric vehicles, lithium-ion batteries have become the most widely used secondary battery technology in social life. However, with the rapid increase in the number of lithium-ion battery products, negative news about lithium-ion batteries smoking, catching fire and even exploding is endless. The safety and energy density of lithium-ion batteries need to be improved. [0003] Traditional liquid lithium batteries are difficult to avoid battery safety accidents due to the volatile and flammable characteristics of liquid electrolytes. Therefore, solid electrolytes have attracted attention as an alternative product with higher safety performance. The existing solid electrolytes can be divided into three categorie...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/058Y02E60/10Y02P70/50
Inventor 梁成都刘成勇胡波兵郭永胜李谦付佳玮程萌
Owner CONTEMPORARY AMPEREX TECH CO
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