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A polymer solid electrolyte material, solid electrolyte membrane and preparation method thereof

A technology of solid electrolyte membrane and polymer, applied in circuits, electrical components, secondary batteries, etc., can solve the problem of low room temperature ionic conductivity, achieve high room temperature ionic conductivity, simple process, and strong adaptability

Active Publication Date: 2021-01-29
ETRUST POWER ETP GRP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In view of the above problems, the purpose of the present invention is to provide a polymer solid electrolyte material, a solid electrolyte membrane and a preparation method thereof to solve the technical problem of low room temperature ionic conductivity

Method used

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  • A polymer solid electrolyte material, solid electrolyte membrane and preparation method thereof
  • A polymer solid electrolyte material, solid electrolyte membrane and preparation method thereof
  • A polymer solid electrolyte material, solid electrolyte membrane and preparation method thereof

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preparation example Construction

[0029] A method for preparing a polymer solid electrolyte membrane, comprising the following steps:

[0030] 1) Dissolving silk fibroin in water to form an aqueous solution of silk fibroin with a concentration of 4-9% (w / v), and putting it in a refrigerator at -20-4°C to refrigerate for later use. Since silk fibroin is easy to expire and deteriorate, it needs to be stored under low temperature conditions.

[0031] 2) In a stirring state, add the polymer matrix material into the silk fibroin aqueous solution, and stir for 12-48 hours to obtain a mixed solution.

[0032] Wherein, the stirring rate is 30-500 rpm / min.

[0033] 3) adding the lithium salt into the mixed solution and stirring for 12-48 hours to obtain a solid electrolyte solution.

[0034] Wherein, the stirring rate is 30-500 rpm / min.

[0035] 4) Coating the solid electrolyte solution on the mold and drying it to obtain the polymer solid electrolyte membrane.

[0036] Wherein, the drying process is: drying in a v...

Embodiment 1

[0038] A polymer solid electrolyte material comprises lithium salt, polymer matrix material and silk fibroin, the content of lithium salt is 5wt%, the content of polymer matrix material is 30wt%, and the content of silk fibroin is 65wt%.

[0039] Wherein, silk fibroin is mulberry silk fibroin. The lithium salt is lithium bistrifluoromethylsulfonyl imide. The polymer matrix material is a mixture of polyvinyl alcohol and polyoxyethylene, wherein the mass ratio of polyvinyl alcohol to polyoxyethylene is 1.5:1.

[0040] A polymer solid-state electrolyte membrane, comprising the above-mentioned polymer solid-state electrolyte material.

[0041] A method for preparing a polymer solid electrolyte membrane, comprising the following steps:

[0042] 1) Dissolving silk fibroin in water to form a silk fibroin aqueous solution with a concentration of 6% (w / v), and putting it in a refrigerator at 4°C for later use;

[0043] 2) In a stirring state, add the polymer matrix material into the...

Embodiment 2

[0047] A polymer solid state electrolyte material comprises lithium salt, polymer matrix material and silk fibroin, the content of lithium salt is 10wt%, the content of polymer matrix material is 40wt%, and the content of silk fibroin is 50wt%.

[0048] Wherein, silk fibroin is spider silk fibroin. The lithium salt is a mixture of lithium bistrifluoromethanesulfonyl imide and lithium perchlorate trihydrate. The polymer matrix material is a one-component water-based polyurethane emulsion, specifically: 2-heptyl-3,4-bis(9-isocyanatononyl) 1-pentylcyclohexylamine, wherein bistrifluoromethyl The mass ratio of lithium sulfonylimide to lithium perchlorate trihydrate is 1:1.

[0049] A polymer solid-state electrolyte membrane, comprising the above-mentioned polymer solid-state electrolyte material.

[0050] A method for preparing a polymer solid electrolyte membrane, comprising the following steps:

[0051] 1) Dissolving silk fibroin in water to form an aqueous silk fibroin soluti...

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Abstract

The invention discloses a polymer solid electrolyte material, a solid electrolyte membrane and a preparation method thereof. The polymer solid electrolyte material includes a lithium salt, a polymer matrix material and silk fibroin, and the content of the lithium salt is 1 to 20 wt%. The content of the polymer matrix material is 3-60 wt%, and the content of the silk fibroin is 20-96 wt%. The invention has the advantages of simple preparation process and low cost, both the silk fibroin and the polymer matrix material contain a large amount of oxygen-containing functional groups, which is conducive to the rapid conduction of lithium ions, and can improve the room temperature ion conductivity value of the polymer solid electrolyte material ; In addition, due to the α-helix and β-sheet structure in silk fibroin, the high temperature resistance and mechanical strength of the solid electrolyte material are enhanced, which can inhibit the growth of lithium dendrites and prevent them from being pierced by lithium dendrites.

Description

technical field [0001] The invention relates to the field of solid electrolytes, in particular to a polymer solid electrolyte material, a solid electrolyte membrane and a preparation method thereof. Background technique [0002] Electrolytes are important components in electrochemical devices. At present, the electrolyte of lithium secondary batteries is mainly composed of organic solvents and lithium salts. At present, the commonly used organic electrolytes are prone to fire, explosion, leakage and other safety hazards, which seriously restrict the development of lithium secondary batteries. [0003] Polymer solid-state electrolytes have attracted extensive attention due to their good continuous performance and high safety, which can prevent electrolyte leakage and do not require a separator. However, the room temperature ionic conductivity of polymer solid electrolytes is low (10 -5 ~10 -6 S cm -1 ), which limits its practical application. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0565Y02E60/10
Inventor 张静娴侯小贺程君
Owner ETRUST POWER ETP GRP LTD
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