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All-solid composite polymer solid electrolyte and preparation method thereof

A solid electrolyte and matrix technology, applied in electrolytes, circuits, electrical components, etc., can solve problems affecting battery current density and cycle performance, low ionic conductivity, poor interface stability, etc., to achieve improved conductivity, high conductivity, The effect of low crystallinity

Active Publication Date: 2019-07-09
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then the interfacial stability of the solid polymer electrolyte is poor, which affects the current density and cycle performance of the battery, and the ionic conductivity of the solid polymer electrolyte is relatively low compared to liquid and gel electrolytes

Method used

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  • All-solid composite polymer solid electrolyte and preparation method thereof
  • All-solid composite polymer solid electrolyte and preparation method thereof
  • All-solid composite polymer solid electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Preparation of polyperfluorohexyl ethyl methacrylate

[0039] According to azobisisobutyronitrile: polyperfluorohexyl ethyl methacrylate = 1:99, feed into the reaction kettle separately, dissolve in DMF solution, and raise the temperature to 70°C, nitrogen protection, and continue the reaction for seven Hours; after the reaction is over, the product solution is concentrated, separated out using n-hexane solution, and washed several times to obtain polyperfluorohexylethyl methacrylate, and then dried at 50-60°C for future use.

Embodiment 2

[0040] Example 2 Preparation of solid electrolyte matrix S1

[0041] Take an appropriate amount of PEO polymer (polyethylene oxide) and polyperfluorohexylethyl methacrylate and dry it in vacuum at 60°C for 24h, weigh 5.28g of PEO polymer and 2.64g of polyperfluorohexylethylmethacrylate Acrylate poly(PEO polymer: polyperfluorohexylethyl methacrylate poly=10:5), add an appropriate amount of acetonitrile, and stir magnetically at 60°C until uniform to obtain a solid electrolyte matrix S1. In order to further verify the formation of solid electrolyte matrix S1, the XSD diagrams of the blended product and the two raw materials were compared and analyzed. The comparison results showed that a new polymer phase, namely solid electrolyte matrix S1, was formed after blending.

Embodiment 3

[0042] Example 3 Preparation of solid electrolyte matrix S2

[0043]Take an appropriate amount of PEO polymer (polyethylene oxide) and polyperfluorohexylethyl methacrylate and dry it in vacuum at 60°C for 24h, weigh 5.28g of PEO polymer and 5.28g of polyperfluorohexylethyl methacrylate Acrylate poly(PEO polymer: polyperfluorohexylethyl methacrylate poly=10:10), add an appropriate amount of acetonitrile, and stir magnetically at 70°C until uniform to obtain a solid electrolyte matrix S2.

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Abstract

The invention relates to an all-solid composite polymer solid electrolyte and a preparation method thereof. The all-solid composite polymer solid electrolyte comprises a solid electrolyte matrix and alithium salt, wherein the molar ratio of the lithium ion in the lithium ion solid electrolyte to the ether oxygen atom in the polyethylene oxide is, namely, Li: EO=1: 4-25, the solid electrolyte matrix is prepared by blending polyethylene oxide and polyperfluorohexyl ethyl methacrylate, and the mass ratio of the polyethylene oxide and the polyperfluorohexyl ethyl methacrylate is 10: 1-10. The preparation method of the all-solid composite polymer solid electrolyte comprises the steps of preparing the polyperfluorohexyl ethyl methacrylate, preparing the solid electrolyte matrix and further preparing the all-solid composite polymer solid electrolyte. The all-solid composite polymer solid electrolyte has the characteristics of wide electrochemical window, high ion conductivity, good stabilityperformance and good mechanical performance and the like.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an all-solid composite polymer solid electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion battery has the characteristics of high energy density, high output voltage, no memory effect, and environmental friendliness. It is a green chemical power source with good economic benefits, social benefits and strategic significance. However, because lithium-ion batteries use flammable, volatile, and highly reactive organic liquid electrolytes, many safety issues have been raised. The current solution is to use solid or semi-solid electrolyte materials instead of organic liquid electrolytes, such as gel electrolytes, polymer solid electrolytes, and inorganic solid electrolytes. [0003] Among them, gel electrolyte is a transitional stage between liquid electrolyte and polymer solid electrolyte, which has high lithium ion conductivity, low s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0091Y02E60/10
Inventor 陈步天余意何凤荣
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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