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A kind of composite solid electrolyte and preparation method thereof

A technology of solid electrolyte and electrolyte layer, applied in the direction of non-aqueous electrolyte batteries, circuits, electrical components, etc., can solve the problems of unstable contact of inorganic solid electrolyte/metal lithium interface, improve stability and electrochemical window, reduce Effect of high impedance, reduced production cost and complexity of production process

Active Publication Date: 2019-07-23
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention is to provide a composite solid electrolyte, which can solve the instability and poor contact of the inorganic solid electrolyte / metal lithium interface in solid-state batteries

Method used

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  • A kind of composite solid electrolyte and preparation method thereof
  • A kind of composite solid electrolyte and preparation method thereof
  • A kind of composite solid electrolyte and preparation method thereof

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Embodiment 1

[0052] A kind of composite solid electrolyte, described composite solid electrolyte is the Li that surface is modified with mixture electrolyte layer 1.5 al 0.5 Ti 1.5 (PO 4 ) 3 (abbreviated as LATP) oxide electrolyte sheet, the mixture electrolyte layer is PEO (polyethylene oxide, polyoxyethylene), LiN (SO 2 CF 3 ) 2 (Lithium triflate) and Li 10 GeP 2 S 12 mixture. Among them, EO / Li(EO refers to the repeating unit in the PEO matrix, Li refers to LiN(SO 2 CF 3 ) 2 Lithium ion) molar ratio is 18:1, Li 10 GeP 2 S 12 The mass ratio to the polymer matrix is ​​5:100. The thickness of the mixture electrolyte layer was 1 μm.

[0053] The preparation method of the above-mentioned composite solid electrolyte is as follows: under the protection of argon atmosphere, PEO and LiN(SO 2 CF 3 ) 2 After weighing according to the EO / Li molar ratio of 18:1, stir in ACN (acetonitrile, acetonitrile), and add a mass ratio of 5% Li after stirring evenly. 10 GeP 2 S 12 , continu...

Embodiment 2

[0056] A kind of composite solid electrolyte, described composite solid electrolyte is the Li that surface is modified with mixture electrolyte layer 7 La 3 Zr 2 o 12 (abbreviated as LLZO) oxide electrolyte sheet, the mixture electrolyte layer is PAN (polyacrylonitrile, polyacrylonitrile), LiClO 4 (lithium perchlorate) and Li 2 S-P 2 S 5 -P 2 o 5 mixture. Among them, AN / Li (AN refers to the repeating unit in the PAN matrix, Li refers to LiClO 4 Lithium ion) molar ratio is 10:1, Li 2 S-P 2 S 5 -P 2 o 5 The mass ratio to the polymer matrix is ​​1:100. The thickness of the mixture electrolyte layer was 1 μm.

[0057] The preparation method of the above composite solid electrolyte is as follows: under the protection of argon atmosphere, PAN and LiClO 4 After weighing according to the AN / Li molar ratio of 10:1, stir in DMF (N,N-dimethylformamide, N,N-dimethylformamide), and add Li with a mass ratio of 1% after stirring evenly 2 S-P 2 S 5 -P 2 o 5 (Li 2 S:P 2 ...

Embodiment 3

[0060]A kind of composite solid electrolyte, described composite solid electrolyte is the LLZO oxide electrolyte sheet that surface is modified with mixture electrolyte layer, and described mixture electrolyte layer is PAN (polyacrylonitrile, polyacrylonitrile), LiClO 4 (lithium perchlorate) and Li 2 S-P 2 S 5 - a mixture of LiI. Among them, AN / Li (AN refers to the repeating unit in the PAN matrix, LI refers to LiClO 4 Lithium ion) molar ratio is 5:1, Li 2 S-P 2 S 5 -P 2 o 5 The mass ratio to the polymer matrix is ​​1:20. The thickness of the mixture electrolyte layer was 1 μm.

[0061] The preparation method of the above composite solid electrolyte is as follows: under the protection of argon atmosphere, PAN and LiClO 4 After weighing according to the AN / Li molar ratio of 10:1, stir in DMF, and add Li with a mass ratio of 5% after stirring evenly. 2 S-P 2 S 5 -LiI(Li 2 S:P 2 S 5 : LiI=0.95(70:30):5), continue stirring to obtain composite slurry; spray the comp...

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Abstract

The invention provides a composite solid electrolyte, and can solve the problem that the interface of inorganic solid electrolyte and metallic lithium in a solid battery is unstable and low in contact. The composite solid electrolyte is an inorganic oxide electrolyte plate modified with a mixture electrolyte layer used for a surface, and the mixture electrolyte layer is a mixture of a polymer matrix, an alkali metal salt and a sulfide. The invention also provides a preparation method of the composite solid electrolyte, the composite solid electrolyte stable for the metallic lithium can be obtained, and the production cost is reduced.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of lithium batteries, and in particular relates to a composite solid electrolyte stable to metal lithium and a preparation method thereof. [0003] 【Background technique】 [0004] Lithium metal has a low electrode potential (-3.04V vs. NHE) and a high mass specific capacity (3861mAh / g), making it an ideal anode material in chemical power sources. At the same time, as a solid electrolyte in the emerging field of energy storage research, it has similar lithium ion conductivity, wider electrochemical window, and more stable physical and chemical properties than traditional electrolytes. Combining metal lithium with solid electrolyte is the research and development direction of the next generation of high energy density and high safety chemical energy storage. [0005] Excellent electrochemical stability is one of the key characteristics that all-solid-state batteries should possess. Although the lithium dendrit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/052
CPCH01M10/052H01M10/0562H01M10/0565Y02E60/10
Inventor 不公告发明人
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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