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Method for preparing composite solid electrolyte based on polyphosphazenes micron-sphere

A solid electrolyte, microsphere technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of poor compatibility, ion conductivity, lithium ion migration number reduction, agglomeration, etc., and achieve good mechanical properties and thermal stability. Effect

Inactive Publication Date: 2010-08-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since ZSM5 is an inorganic filler, its compatibility with PEO is poor, and it will cause agglomeration at a higher filling amount, which will reduce the ion conductivity and lithium ion migration number.

Method used

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  • Method for preparing composite solid electrolyte based on polyphosphazenes micron-sphere
  • Method for preparing composite solid electrolyte based on polyphosphazenes micron-sphere
  • Method for preparing composite solid electrolyte based on polyphosphazenes micron-sphere

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Step 1: Weigh 0.1 g of polyphosphazene microspheres, add them to 30 ml of acetonitrile, and ultrasonically disperse for 15 minutes to obtain an acetonitrile solution of polyphosphazene microspheres;

[0023] Step 2, weigh 1.0g polyoxyethylene and 0.242g LiClO respectively 4 (PEO and LiClO 4 O / Li molar ratio is 10:1), join in the acetonitrile solution of polyphosphazene microsphere, stir with magnetic stirrer for 8 hours, obtain mixed solution;

[0024] Step 3: casting the mixed solution onto a polytetrafluoroethylene template, volatilizing the solvent for 6 hours, and drying in a vacuum oven at 50° C. for 24 hours to obtain a composite solid polymer electrolyte.

[0025] Implementation effect of this embodiment: figure 1 is a scanning electron microscope (SEM) photograph of polyphosphazene microspheres (PZSMS). It can be seen from the figure that the diameter distribution of polyphosphazene microspheres is uniform and the dispersion is very good; figure 2 Scanning ...

Embodiment 2

[0027] Step 1: Weigh 0.2 g of polyphosphazene microspheres, add them to 40 ml of acetonitrile, and ultrasonically disperse for 20 minutes to obtain an acetonitrile solution of polyphosphazene microspheres;

[0028] Step 2, weigh 1.0g polyoxyethylene and 0.3025g LiClO respectively 4 (PEO and LiClO 4 The O / Li molar ratio is 8: 1), was added in the acetonitrile solution of polyphosphazene microspheres, stirred with a magnetic stirrer for 9 hours to obtain a mixed solution;

[0029] Step 3: casting the mixed solution onto a polytetrafluoroethylene template, volatilizing the solvent for 7 hours, and drying in a vacuum oven at 50° C. for 36 hours to obtain a composite solid polymer electrolyte.

[0030] Implementation effect of this example: the characterization of the composite solid polymer electrolyte is as in Example 1. The room temperature conductivity of the composite polymer electrolyte is 1.1×10 -5 S / cm, the electrochemical stability window is 4.9V, and the lithium ion mi...

Embodiment 3

[0032] Step 1: Weigh 0.3 g of polyphosphazene microspheres, add them to 40 ml of acetonitrile, and ultrasonically disperse for 30 minutes to obtain an acetonitrile solution of polyphosphazene microspheres;

[0033] Step 2, weigh 1.0g polyoxyethylene and 0.2017g LiClO respectively 4 (PEO and LiClO 4 The O / Li molar ratio is 12:1), was added in the acetonitrile solution of polyphosphazene microspheres, stirred with a magnetic stirrer for 10 hours to obtain a mixed solution;

[0034] Step 3: casting the mixed solution onto a polytetrafluoroethylene template, volatilizing the solvent for 8 hours, and drying in a vacuum oven at 50° C. for 28 hours to obtain a composite solid polymer electrolyte.

[0035]Implementation effect of this example: the characterization of the composite solid polymer electrolyte is as in Example 1. The room temperature conductivity of the composite polymer electrolyte is 1.02×10 -5 S / cm, the electrochemical stability window is 5.0V, and the lithium ion m...

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Abstract

The invention discloses a method for preparing a composite solid electrolyte based on a polyphosphazenes micron-sphere, belonging to the technical field of lithium ion batteries. The method comprises the following steps of: preparing acetonitrile solution of the polyphosphazenes micron-sphere; and adding polyoxyethylene and lithium perchlorate and pouring the mixture to a polytetrafluoroethylene template to prepare the composite solid electrolyte. The polyphosphazenes micron-sphere prepared by the invention has uniform arrangement of the diameters, favorable dispersion degrees as well as smooth and uniform surfaces of the film, which proves that organic / inorganic hybrid polyphosphazenes micron-sphere and a PEO polymer electrolyte matrix have favorable compatibility and indicates that the composite polymer electrolyte has high room-temperature conductivity, a high electrochemical stable window and high lithium ion transference number. The composite solid electrolyte can be used as a lithium ion battery solid electrolyte material.

Description

technical field [0001] The invention relates to a preparation method in the technical field of lithium batteries, in particular to a preparation method of an inorganic-organic hybrid composite solid electrolyte based on polyphosphazene microspheres. Background technique [0002] Polymer electrolytes are especially suitable as electrolyte materials for lithium-ion batteries due to their light weight, good viscoelasticity, and good film-forming properties. Compared with ordinary liquid lithium-ion batteries, polymer lithium-ion batteries using polymer electrolyte membranes as separators and electrolytes have significantly improved battery specific energy, safety, and structural design. As the separator and electrolyte of polymer lithium-ion batteries, polymer electrolyte membranes should have high room temperature ionic conductivity, good electrode interface stability, wide electrochemical window and good mechanical properties. Polyethylene oxide (PEO) has attracted much atte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L71/02C08L85/02C08K3/24H01M10/056
CPCY02E60/12Y02E60/10
Inventor 张家维黄小彬唐小真刘凤凤刘维
Owner SHANGHAI JIAO TONG UNIV
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