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Compound polymer electrolytic material and preparation method thereof

A technology of electrolyte materials and polymers, applied in the field of composite polymer electrolyte materials and their preparation, can solve the problems of plastic crystal materials being fragile and difficult to prepare, and achieve the effects of low cost, simple preparation method, and increased safety

Inactive Publication Date: 2007-10-03
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), the percentage of succinonitrile is according to the percentage of succinonitrile [P(VDF-HFP) +LiTFSI+SN] total weight calculation, (component expression is: (1-x)[P(VDF-HFP)-LiTFSI]-(x)SN), these three substances are mixed, then dissolved with acetone, Stir until uniform, and then pour the solution 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.

[0032] The thermal properties (Fig. 1), phase composition (Fig. 2), ionic conductivity (Figs. 3 and 4), and mechanical properties (Fig. 5) of the as-prepared samples were tested. After analysis and comparison, the following conclusions are drawn:

[0033] 1) When the succinonitrile content is 0% to 74%, the prepared composite electrolyte is a self-supporting film with a certain strengt...

Embodiment 2

[0036] Embodiment 2P (VDF-HFP) / LBETI / succinonitrile system

[0037] 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.

[0038] Thermal properties (Figure 6), XRD (Figure 7), ion conductivity (Figures 8 and 9) and mechanical properties tests (Figure 10) were performed on the prepared samples. After analysis and comparison, the following conclusions are drawn:

[0039] 1) When the succinonitrile content is 0% to 67%, the prepared composite electrolyte is a self-supporting film ...

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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 Scm -1 ), must also have better film-forming properties and higher mechanical strength. At present, polymer electrolytes...

Claims

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Application Information

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