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All-solid-state polymer electrolyte and preparation method and application thereof

An all-solid polymer and electrolyte technology, which is applied in the direction of solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., can solve the problems of difficult to meet the actual application requirements, unsatisfactory effect, low ion conductivity, etc. Effects of lithium dendrite growth, good mechanical properties and thermal stability, and wide electrochemical window

Active Publication Date: 2021-09-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polyoxyethylene-based polymer solid-state electrolyte has the advantages of strong designability, excellent performance in dissolving lithium salts, wide electrochemical window, and is expected to match high-voltage positive electrodes. It is easy to crystallize under the environment, and the ionic conductivity is low, which is still difficult to meet the needs of practical applications.
In order to overcome the defects of polyoxyethylene polymer solid electrolytes, various modification studies have been carried out (such as: adding fillers, blending, copolymerization, etc.), but the actual results are not satisfactory.

Method used

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  • All-solid-state polymer electrolyte and preparation method and application thereof
  • All-solid-state polymer electrolyte and preparation method and application thereof
  • All-solid-state polymer electrolyte and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0046] A kind of all-solid polymer electrolyte, its preparation method comprises the following steps:

[0047] 1) Mix 84 mg of diamino-terminated polyethylene glycol with a number average molecular weight of 2000, 20 mg of trimethylolpropane triglycidyl ether, and 1 mL of tetrahydrofuran (the amino group in the diamino-terminated polyethylene glycol, trimethylol The molar ratio of the epoxy group in the oxypropane triglycidyl ether is 1:2), reacted at 40°C for 6h, and obtained the prepolymer;

[0048]2) 100 mg of polyethylene glycol methacrylate with a number average molecular weight of 950, 0.2 mg of polyethylene glycol dimethacrylate with a number average molecular weight of 550, 2 mg of dicumyl peroxide, and 70 mg of bistrifluoromethyl Lithium sulfonylimide is mixed with 2mL of tetrahydrofuran, and then the prepolymer in step 1) is added, and mixed evenly to obtain a precursor solution;

[0049] 3) Coat the precursor solution on a clean glass sheet, place it in a vacuum ov...

Embodiment 2

[0064] A kind of all-solid polymer electrolyte, its preparation method comprises the following steps:

[0065] 1) Mix 85 mg of diamino-terminated polyethylene glycol with a number average molecular weight of 6000, 6.5 mg of trimethylolpropane triglycidyl ether and 1 mL of tetrahydrofuran (the amino group, trihydroxy group in the diamino-terminated polyethylene glycol The molar ratio of epoxy groups in methylpropane triglycidyl ether is 1:2), and reacted at 50°C for 3h to obtain a prepolymer;

[0066] 2) 100 mg of polyethylene glycol methacrylate with a number average molecular weight of 950, 0.2 mg of polyethylene glycol dimethacrylate with a number average molecular weight of 550, 2 mg of dicumyl peroxide, and 69 mg of bistrifluoromethyl Lithium sulfonylimide is mixed with 2mL of tetrahydrofuran, and then the prepolymer in step 1) is added, and mixed evenly to obtain a precursor solution;

[0067] 3) Coat the precursor solution on a clean glass sheet, place it in a vacuum ov...

Embodiment 3

[0071] A kind of all-solid polymer electrolyte, its preparation method comprises the following steps:

[0072] 1) The epoxy functionalized hexahedral silsesquioxane (structural formula: R is ) and 1 mL of tetrahydrofuran (the molar ratio of the amino group in the diamino-terminated polyethylene glycol to the epoxy group in the epoxy-functionalized hexahedral silsesquioxane is 1:2), react at 40 ° C for 6 h, get the prepolymer;

[0073] 2) Polyethylene glycol methacrylate of 95mg number average molecular weight 950, polyethylene glycol dimethacrylate of 0.2mg number average molecular weight 550, 2mg of dicumyl peroxide, 60mg of bistrifluoroform Lithium sulfonylimide is mixed with 2mL of tetrahydrofuran, and then the prepolymer in step 1) is added, and mixed evenly to obtain a precursor solution;

[0074] 3) Coat the precursor solution on a clean glass sheet, place it in a vacuum oven after the solvent evaporates, react at 80°C for 3 hours, and then react at 115°C for 24 hou...

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Abstract

The invention discloses an all-solid-state polymer electrolyte as well as a preparation method and application thereof. The all-solid-state polymer electrolyte comprises a cross-linked polymer I, a cross-linked polymer II and a lithium salt, cross-linked networks formed by the cross-linked polymer I and the cross-linked polymer II are mutually penetrated. The cross-linked polymer I is obtained by polymerizing acrylic acid macrogol ester or methacrylic acid macrogol ester and diacrylic acid macrogol ester or dimethyl acrylic acid macrogol ester. The cross-linked polymer II is obtained by polymerizing double-amino-terminated polyethylene glycol and an epoxy group cross-linking agent. A soft-hard double-crosslinking network exists in the all-solid-state polymer electrolyte, so that the all-solid-state polymer electrolyte is relatively good in lithium dendrite growth inhibition capability, has stable interface performance, relatively wide electrochemical window and relatively excellent mechanical property and thermal stability, and can be matched with an active lithium metal negative electrode to prepare a lithium metal battery with high energy density. Therefore, the development of high-power and high-energy energy storage equipment is facilitated, and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of solid electrolytes, in particular to an all-solid polymer electrolyte with a double cross-linked network and a preparation method and application thereof. Background technique [0002] With the development of society and the advancement of science and technology, people's demand for energy has increased dramatically, which has accelerated the transformation of energy and the upgrading of energy storage equipment. New energy sources and high-power energy storage equipment have become research hotspots. Lithium batteries have the advantages of high charge and discharge efficiency, low self-discharge, and environmental friendliness, and occupy a huge market share. However, most of the current commercial lithium batteries use liquid electrolytes, which have great potential safety hazards, and generally use graphite anodes, which have low energy density and are difficult to meet the application needs of large-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D171/02C09D155/00C09D7/63C08J3/24C08L71/02C08L55/00H01M10/0565H01M10/052
CPCC09D171/02C09D155/005C09D7/63C08J3/246H01M10/0565H01M10/052C08J2371/02C08J2455/00C08J2355/00C08J2471/02H01M2300/0082C08L55/005C08K5/435C08L71/02Y02E60/10
Inventor 潘其维朱晨静陈欣
Owner SOUTH CHINA UNIV OF TECH
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