A kind of multi-layer solid electrolyte and its preparation method and lithium battery formed therefrom

A solid electrolyte and electrolyte technology, applied in the direction of non-aqueous electrolyte batteries, solid electrolytes, electrolytes, etc., can solve problems such as easy growth of lithium dendrites, achieve the effects of repairing cell tissue, buffering mechanical pressure, and reducing interface impedance

Active Publication Date: 2021-11-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the technical problem that lithium dendrites are extremely easy to grow in metal lithium batteries in the prior art, thereby providing a multilayer solid electrolyte and its preparation method and lithium battery formed therefrom

Method used

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  • A kind of multi-layer solid electrolyte and its preparation method and lithium battery formed therefrom
  • A kind of multi-layer solid electrolyte and its preparation method and lithium battery formed therefrom
  • A kind of multi-layer solid electrolyte and its preparation method and lithium battery formed therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Dry the PEO in a vacuum oven at 50°C overnight, weigh 2.5mmol of PEO and dissolve it in 100mL of chloroform, and react at room temperature for 18h. Then pour it into 2L of ether, and PEO forms a precipitate and precipitates out. After the precipitate is separated by suction filtration, it is left to stand overnight in a fume hood, and then dried in a vacuum oven at 50°C for 5 hours to obtain a white cotton-like product of PEO. Weigh the white cottony product of PEO (—EO—) and lithium salt (LiTFSI), n(—EO—): n(Li + ) = 20:1, and heated to 80°C to melt the polymer completely, after mixing the two thoroughly by grinding, use a (hot press) tablet press to form a film at a pressure of 6 MPa and a temperature of 80°C and Cool and shape to obtain a uniform translucent solid electrolyte membrane with a thickness of 50 μm, that is, the supporting layer.

[0042] Using magnetron sputtering to sequentially construct lithium ion fast channel layer (LiPON layer), lithium dendrite s...

Embodiment 2

[0045] Dry the PEO in a vacuum oven at 50°C overnight, weigh 2.5mmol of PEO and dissolve it in 100mL of chloroform, and react at room temperature for 18h. Then pour it into 2L of ether, and PEO forms a precipitate and precipitates out. After the precipitate is separated by suction filtration, it is left to stand overnight in a fume hood, and then dried in a vacuum oven at 50°C for 5 hours to obtain a white cotton-like product of PEO. Weigh the white cottony product of PEO (—EO—) and lithium salt (LiTFSI), n(—EO—): n(Li + ) = 10:1, and heated to 80°C to melt the polymer completely, after mixing the two thoroughly by grinding, use a (hot press) tablet press to form a film at a pressure of 2 MPa and a temperature of 60°C and Cool and shape to obtain a uniform translucent solid electrolyte membrane with a thickness of 50 μm, that is, the supporting layer.

[0046] Using magnetron sputtering to sequentially construct lithium ion fast channel layer (LiPON layer), lithium dendrite s...

Embodiment 3

[0049] Dry the PEO in a vacuum oven at 50°C overnight, weigh 2.5mmol of PEO and dissolve it in 100mL of chloroform, and react at room temperature for 18h. Then pour it into 2L of ether, and PEO forms a precipitate and precipitates out. After the precipitate is separated by suction filtration, it is left to stand overnight in a fume hood, and then dried in a vacuum oven at 50°C for 5 hours to obtain a white cotton-like product of PEO. Weigh the white cottony product of PEO (—EO—) and lithium salt (LiTFSI), n(—EO—): n(Li + ) = 15:1, and heated to 80°C to melt the polymer completely, and after the two are thoroughly mixed by grinding, they are extruded into a film with a (hot press) tablet press at a pressure of 4MPa and a temperature of 70°C. Cool and shape to obtain a uniform translucent solid electrolyte membrane with a thickness of 100 μm, that is, the support layer.

[0050] Using magnetron sputtering to sequentially construct lithium ion fast channel layer (LiPON layer), l...

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Abstract

The invention relates to a multilayer solid electrolyte in the technical field of new energy materials, a preparation method thereof and a lithium battery formed therefrom. The multilayer solid electrolyte includes sequentially arranged 1×10 ‑6 Lithium ion uniform deposition layer, lithium dendrite suppression layer and support layer with ion conductivity above S / cm. The uniform deposition layer of lithium ions can well protect the surface of lithium metal and induce Li + The uniform distribution of lithium dendrites; the lithium dendrite suppression layer provides mechanical support for the electrolyte as a whole, while preventing lithium dendrites from piercing the separator and inhibiting the growth of lithium dendrites; The supporting characteristics and mechanical strength are not high enough to completely prevent the problem of lithium dendrite piercing. On the other hand, it is beneficial to reduce the interface impedance. The multilayer solid electrolyte of the present invention has the advantages of high electrical conductivity, high mechanical strength, low electrolyte / positive electrode interface resistance and high temperature resistance, and can simultaneously realize the protection of lithium metal and the suppression of lithium dendrites.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a multilayer solid electrolyte, a preparation method thereof, and a lithium battery formed therefrom. Background technique [0002] Lithium-based batteries are divided into lithium metal batteries and lithium-ion batteries. At present, the specific energy of commercialized lithium-ion batteries is close to the theoretical capacity, and it is difficult to continue to improve, so it is necessary to develop batteries with higher specific energy. Lithium metal is the metal with the smallest atomic weight (6.94) and the lowest electrochemical potential of the negative electrode (-3.04V relative to the standard hydrogen electrode) among known metals, so it has the highest battery voltage when it forms a battery with an appropriate positive electrode material. At the same time, lithium metal has a high specific capacity (3860mAh g -1 ) and lower mass density (0.534g / cm 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/052
CPCH01M10/052H01M10/0562H01M10/0565H01M2300/0065H01M2300/0094Y02E60/10
Inventor 陈人杰马一添黄永鑫胡昕梅杨孟倩倩管敏榕伍鸿宇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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