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A kind of solid electrolyte membrane and its preparation method and application

A technology of solid electrolyte membrane and solid electrolyte, which is used in solid electrolyte, electrolyte battery manufacturing, non-aqueous electrolyte, etc., can solve the problems of increasing impedance, reducing compaction density, uneven surface unevenness of pole piece, and simplifying the preparation process. , improve the first effect, the effect of good performance

Active Publication Date: 2022-02-25
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by this method, after the lithium powder is dissolved, a lot of holes will be left inside the pole piece, or the surface of the pole piece will become uneven.
Not only the compaction density is reduced, but the conduction of electrons in the negative electrode will also be greatly affected due to the increase in impedance, and what’s more, lithium dendrites will be formed in the thinner area of ​​the pole piece, which will further damage the energy density of the battery.

Method used

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  • A kind of solid electrolyte membrane and its preparation method and application
  • A kind of solid electrolyte membrane and its preparation method and application
  • A kind of solid electrolyte membrane and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0071] This embodiment provides a solid electrolyte membrane such as figure 2 As shown in the figure, the solid electrolyte membrane includes a first solid electrolyte membrane and a second solid electrolyte membrane stacked, and the first solid electrolyte membrane is composed of Li 6 P.S. 5 Cl (with a particle size of 2 μm) and lithium powder (with a particle size of 10 μm), the second solid electrolyte membrane is composed of Li 10 GeP 2 S 12 And PP three-dimensional fiber skeleton material (pore diameter is 50 μ m, porosity is 90%) composition.

[0072] The preparation method of the above-mentioned solid electrolyte membrane is as follows:

[0073] (1) Will Li 6 P.S. 5 Cl (with a particle size of 2 μm), lithium powder (with a particle size of 10 μm), PTFE and toluene were uniformly mixed to form a composite solid electrolyte slurry, in which Li 6 P.S. 5 The mass ratio of Cl, lithium powder and PTFE is 80:18:2, and then the composite solid electrolyte slurry is coa...

Embodiment 2

[0079] This embodiment provides a solid electrolyte membrane such as figure 2 As shown in the figure, the solid electrolyte membrane includes a first solid electrolyte membrane and a second solid electrolyte membrane stacked, and the first solid electrolyte membrane is composed of Li 7 La 3 Zr 2 o 12 (particle size is 2μm) and lithium powder (particle size is 5μm), the second solid electrolyte membrane is made of Li 6 P.S. 5 Cl and PET three-dimensional fiber skeleton material (pore diameter is 50 μ m, porosity is 90%) composition.

[0080] The preparation method of the above-mentioned solid electrolyte membrane is as follows:

[0081] (1) Will Li 7 La 3 Zr 2 o 12 (particle size is 2 μm), lithium powder (particle size is 5 μm), PVDF and ethylbenzene are uniformly mixed to form a composite solid electrolyte slurry, in which Li 7 La 3 Zr 2 o 12 , lithium powder, PVDF mass ratio 70:25:5, then coating, spraying or laminating the composite solid electrolyte slurry on th...

Embodiment 3

[0086] This embodiment provides a solid electrolyte membrane such as figure 2 As shown in the figure, the solid electrolyte membrane includes a first solid electrolyte membrane and a second solid electrolyte membrane that are laminated, and the first solid electrolyte membrane is made of PEO (with a particle size of 20 μm) and molten lithium (with a particle size of 50 μm), the second solid electrolyte membrane is composed of Li 7 La 3 Zr 2 o 12 And PU three-dimensional fiber skeleton material (pore diameter is 50 μ m, porosity is 90%) composition.

[0087] The preparation method of the above-mentioned solid electrolyte membrane is as follows:

[0088] (1) PEO (with a particle size of 20 μm), molten lithium (with a particle size of 50 μm), PETF and ethylbenzene were uniformly mixed to form a composite solid electrolyte slurry, in which Li 7 La 3 Zr 2 o 12 , lithium powder, PETF mass ratio 90:5:5, then coating, spraying or laminating the composite solid electrolyte slu...

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Abstract

The invention relates to a solid electrolyte membrane and its preparation method and application. The solid electrolyte membrane includes a combination of a first solid electrolyte and a pre-lithiation agent. Lithiation Different solid electrolyte membrane pre-lithiation technology, while realizing pre-lithiation, forms a solid electrolyte membrane, improves the first charge and discharge efficiency of the battery, and simplifies the preparation process.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a solid electrolyte membrane and its preparation method and application. Background technique [0002] The development of lithium-ion batteries in modern society has received more and more attention. Silicon has the advantages of high specific capacity, low delithiation potential, and abundant reserves. Applied commercial graphite anode. The efficiency of high-capacity silicon-based negative electrode materials is low for the first time, and it is difficult to achieve an energy density of 400Wh / kg under the design conditions of the limit process. efficiency. Pre-lithiation is an effective method to improve the first-time efficiency of high-capacity anode materials. At present, the commonly used pre-lithiation process is realized by electrochemical pre-lithiation, positive electrode lithium supplementation, and negative electrode lithium supplementation. Electrochemical pre-li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/0525H01M10/058
CPCH01M10/056H01M10/0525H01M10/058H01M2300/0065Y02E60/10Y02P70/50
Inventor 翟喜民姜涛陈慧明孙焕丽孟祥宇许立超
Owner CHINA FIRST AUTOMOBILE