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Compound polymer electrolytic material and preparation method thereof

An electrolyte material and polymer technology are applied in the field of composite polymer electrolyte materials and their preparation, which can solve the problems of difficult preparation and easily broken plastic crystal materials, and achieve the effects of simple preparation method, low cost and alleviating environmental pollution.

Inactive Publication Date: 2009-04-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the plastic crystal material is easy to break and is not easy to be prepared into a thin film. When it is assembled into a battery, it is still necessary to use a commercial microporous film to separate the positive and negative materials.

Method used

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  • Compound polymer electrolytic material and preparation method thereof
  • Compound polymer electrolytic material and preparation method thereof
  • Compound polymer electrolytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1P (VDF-HFP) / LiTFSI / succinonitrile system

[0031] Weigh 1g P(VDF-HFP) and 0.8g LiTFSI and different weights (0%~74%) of succinonitrile (SN),

[0032] The percentage content of succinonitrile is calculated according to the total weight of succinonitrile in [P(VDF-HFP)+LiTFSI+SN], (the component expression is: (1-x)[P(VDF-HFP)-LiTFSI] -(x) SN), mix the three substances, then dissolve them with acetone, stir until uniform, then pour the solution onto the tetrafluoro mold, in N 2 The solvent was evaporated under atmosphere protection, and dried in a vacuum oven at 30° C. for two days.

[0033] The thermal properties of the as-prepared samples ( figure 1 ), phase composition ( figure 2 ), ionic conductivity ( image 3 and Figure 4 ) and mechanical performance testing ( Figure 5 ). After analysis and comparison, the following conclusions are drawn:

[0034] 1) When the succinonitrile content is 0% to 74%, the prepared composite electrolyte is a self-sup...

Embodiment 2

[0037] Embodiment 2 P(VDF-HFP) / LBETI / succinonitrile system

[0038] Take a certain amount of P(VDF-HFP, LBETI and succinonitrile, so that the ratio of P(VDF-HFP)+SN and LiBETI remains 80% and 20%, specifically, weigh 0.76g LBETI, P( The total weight of VDF-HFP) and succinonitrile remains 3g (component expression is: 80% [(1-x) P (VDF-HFP)-(x) SN]-20% LiBETI), this three The two substances are mixed, then dissolved with acetone, stirred until uniform, and then the solution is poured on the tetrafluoro mold, in N 2 The solvent was evaporated under atmosphere protection, and dried in a vacuum oven at 30° C. for two days.

[0039] The thermal properties of the prepared samples ( Figure 6 ), XRD ( Figure 7 ), ionic conductivity ( Figure 8 and Figure 9 ) and mechanical performance testing ( Figure 10 ). After analysis and comparison, the following conclusions are drawn:

[0040] 1) When the content of succinonitrile is 0% to 67%, the prepared composite electrolyte is a ...

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Abstract

This invention relates to a compound type polymer dielectric stuff and its preparation method, belong to electrochemistry and new energy stuff region. It composed by copolymer of fluoro ethylene and hexafluoro-propylene, lithium salts and plastic crystal stuff. Processing steps: take copolymer, lithium salts and plastic crystal stuff, use solvent to dissolve, whip go as far as uniformity, then pour above solution to teflon tooting, evaporate solvent, finally vacuum drying. While this compound type electrolyte stuff in rather wide temperature range and all components are solid-state, the ionic conductivity can reach using standard of lithium Secondary Battery. It overcomes shortcoming of traditional gel-type polymer dielectric that liquid electrolyte easily leak as well as plastic crystal electrolyte unease form film, and also combine the merit that polymer dielectric easily form film as well as plastic crystal electrolyte has high room temperature ionic conductivity.

Description

technical field [0001] The invention belongs to the field of electrochemistry and new energy materials, and in particular provides a composite polymer electrolyte material and a preparation method thereof. Background technique [0002] Lithium secondary batteries currently on the market basically use organic electrolytes containing lithium salts as electrolytes, which have problems such as leakage, poor stability, short cycle life, and complex production processes. Replacing the organic electrolyte in lithium secondary batteries with all-solid polymer electrolytes can not only achieve lightweight, thin film, fast charging, and high energy density, but also solve safety problems such as leakage, combustion, and explosion. As an ideal solid electrolyte for lithium secondary batteries, in addition to meeting the normal temperature ionic conductivity (10 -3 S cm -1 ), must also have better film-forming properties and higher mechanical strength. At present, polymer electrolyte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08L27/20C08J5/00
Inventor 范丽珍
Owner UNIV OF SCI & TECH BEIJING
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