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Preparation method of composite solid electrolyte based on polyphosphazene carbide micro-nanometer material

A solid electrolyte, carbonized polyphosphazene technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of small surface area, few voids, limiting the electrical properties of solid composite polymer electrolytes, etc. The effect of good mechanical properties and high electrochemical stability window

Inactive Publication Date: 2010-12-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the polyphosphazene micro-nanomaterials generated by in-situ polymerization have a small surface area and fewer voids, which limits the further improvement of the electrical properties of the solid composite polymer electrolyte. Therefore, using high porosity but still containing polyphosphazene Particles that hybridize atoms to enhance the electrical properties of solid composite polymer electrolytes have become a valuable research direction as fillers.

Method used

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  • Preparation method of composite solid electrolyte based on polyphosphazene carbide micro-nanometer material
  • Preparation method of composite solid electrolyte based on polyphosphazene carbide micro-nanometer material
  • Preparation method of composite solid electrolyte based on polyphosphazene carbide micro-nanometer material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Weigh 0.005g of carbonized polyphosphazene microspheres (the mass of carbonized polyphosphazene microspheres is 0.5% of the mass of PEO), add it to 30ml of acetonitrile, and ultrasonically disperse for 15 minutes;

[0028] Step 2: Weigh 1.0g PEO (Mw~300,000) and 0.242g LiClO respectively 4 (PEO and LiClO 4 O / Li molar ratio of 10:1) was added to the acetonitrile dispersion of carbonized polyphosphazene microspheres, and stirred and dissolved with a magnetic stirrer for 8 hours;

[0029] Step 3: Cast the obtained mixed solution onto a polytetrafluoroethylene template, and volatilize the solvent for 6 hours;

[0030] Step 4: Transfer the polymer electrolyte membrane obtained in step 3 to a vacuum drying oven, and continue to dry at 50°C for 24 hours to obtain a composite solid polymer electrolyte.

[0031] Implementation effects of this embodiment: figure 1 It is a scanning electron microscope SEM picture of the prepared carbonized polyphosphazene microspheres. It can be s...

Embodiment 2

[0033] Step 1: Weigh 0.0025g of carbonized polyphosphazene nanotubes (the mass of carbonized polyphosphazene nanotubes is 0.25% of the mass of PEO), add them to 40ml of acetonitrile, and ultrasonically disperse for 20 minutes;

[0034] Step 2: Weigh 1.0g PEO (Mw~400,000) and 0.3025g LiClO respectively 4 (PEO and LiClO 4 The molar ratio of O / Li is 8:1) was added to the acetonitrile dispersion of carbonized polyphosphazene nanotubes, and stirred and dissolved with a magnetic stirrer for 9 hours;

[0035] Step 3: Cast the obtained mixed solution onto a polytetrafluoroethylene template, and volatilize the solvent for 7 hours.

[0036] Step 4: Transfer the polymer electrolyte membrane obtained in step 3 to a vacuum drying oven, and continue drying at 50° C. for 28 hours to obtain a composite solid polymer electrolyte.

[0037] Implementation effect of this embodiment: The composite solid polymer electrolyte is characterized as in Example 1. figure 2 It is a scanning electron microscope SEM...

Embodiment 3

[0039] Step 1: Weigh 0.0075g of carbonized polyphosphazene nanofibers (the mass of carbonized polyphosphazene nanofibers is 0.75% of the mass of PEO), add them to 45ml of acetonitrile, and ultrasonically disperse for 30 minutes;

[0040] Step 2: Weigh 1.0g PEO (Mw~500,000) and 0.2017g LiClO respectively 4 (PEO and LiClO 4 O / Li molar ratio of 12:1) was added to the acetonitrile dispersion of carbonized polyphosphazene nanofibers, and stirred and dissolved with a magnetic stirrer for 10 hours;

[0041] Step 3: Cast the obtained mixed solution onto a polytetrafluoroethylene template, and volatilize the solvent for 8 hours.

[0042] Step 4: Transfer the polymer electrolyte membrane obtained in step 3 to a vacuum drying oven, and continue to dry at 50° C. for 32 hours to obtain a composite solid polymer electrolyte.

[0043] Implementation effect of this embodiment: The composite solid polymer electrolyte is characterized as in Example 1. image 3 It is the scanning electron microscope SEM ...

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Abstract

The invention relates to a preparation method of composite solid electrolyte based on a polyphosphazene carbide micro-nanometer material, which belongs to the technical field of lithium batteries, the polyphosphazene carbide micro-nanometer material is dispersed in acetonitrile, then polyoxyethylene and lithium hypochlorite are sequentially added and evenly stirred by magnetic force, and then the mixed solution is poured into a polytetrafluoroethylene mould board, thus obtaining the composite solid polymer electrolyte. Compared with the existing electrolyte, the product has higher conductivity and larger lithium ion transference number, good mechanical properties and good electrochemical stability.

Description

Technical field [0001] The invention relates to a dielectric in the technical field of lithium batteries and a preparation method thereof, in particular to a preparation method of a composite solid electrolyte based on carbonized polyphosphazene micro-nano materials. Background technique [0002] All solid-state lithium-ion polymer batteries are expected to become one of the most promising advanced power sources in the future due to their high energy density, excellent cycle performance, processing into any shape, safety and reliability, and many other advantages. PEO-based polymer electrolytes have received wide attention for a long time because they may replace the liquid electrolyte in traditional lithium-ion batteries as the electrolyte material in all-solid-state lithium-ion polymer batteries. Actively develop TLi with high room temperature ion conductivity and lithium ion migration number + A polymer electrolyte with good electrode interface stability, excellent mechanical ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCY02E60/10
Inventor 黄小彬张家维唐小真陈奎永顾晓俊
Owner SHANGHAI JIAO TONG UNIV
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