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Hyperbranched polyether type solid polymer elecrolytes and preparation thereof

A technology of hyperbranched polyether and solid polymer, applied in the direction of circuits, electrical components, secondary batteries, etc., to achieve the effect of lowering the glass transition temperature, good mechanical properties, and good mechanical properties

Inactive Publication Date: 2009-04-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the contradiction problem between mechanical properties and ion conductivity in the solid polymer electrolyte system, and to provide a kind of hyperbranched polymer with high ion conductivity, good mechanical properties, good thermal stability and stable electrochemical performance. Type polyether solid polymer electrolyte and preparation method thereof

Method used

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  • Hyperbranched polyether type solid polymer elecrolytes and preparation thereof
  • Hyperbranched polyether type solid polymer elecrolytes and preparation thereof
  • Hyperbranched polyether type solid polymer elecrolytes and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The polymer electrolyte matrix material A used in Example 1 is based on the ion-conducting group monomer structure 3-(2-hydroxytriethoxy)-3'-methyloxetane as a repeating unit (with the following structure ):

[0027]

[0028] with BF 3 Diethyl ether is used as an initiator to polymerize a class of hyperbranched polyether A without benzene rings, and its weight average molecular weight is 10000; the polymer electrolyte matrix material B used is poly(vinylidene fluoride-hexafluoropropylene) for short: PVDF-HFP; Lithium salt C is lithium bis(trifluoromethylsulfonyl)imide, abbreviated as LiTFSI. All raw materials were vacuum dried before use. Take a certain amount of hyperbranched polyether (abbreviated as polyether A) and poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) according to the mass ratio of 2:1, dissolve them in tetrahydrofuran, stir until uniform, and then Add LiTFSI with a mass percentage of 20% (the mass percentage is calculated based on the tota...

Embodiment 2

[0030] Prepare the polymer electrolyte in the same manner as in Example 1, the difference is that the polymer matrix material B is a PET material with better mechanical properties, and the hyperbranched polyether (polyether A) and polyethylene terephthalate Glycol esters (PET) take a certain amount according to the mass ratio of 1:3, dissolve with tetrahydrofuran, stir until uniform, then add different mass percentages of LiTFSI (mass percentages are calculated according to the total mass of the polymer electrolyte membrane), and continue to stir until the lithium salt is evenly distributed in the solution. The solution was poured into a polytetrafluoroethylene film tool, the solvent was evaporated, and then dried in a vacuum oven at 50° C. for 18 h.

[0031] The prepared solid polymer electrolyte (SPE) was sandwiched between two stainless steel (SS) electrodes to form a SS / SPE / SS battery, and the ionic conductivity of the prepared sample was tested for ionic conductivity ( ...

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Abstract

The invention relates to a hyperbranched polyether type solid polymer electrolyte and a preparation method thereof. The polymer electrolyte material comprises a polymer substrate material (A), a polymer substrate material (B) and lithium salt (C), wherein, the polymer substrate material (A) is hyperbranched polyether which contains ether oxygen group and has completely amorphous structure; and the polymer substrate material (B) is polymer substrate material with excellent and mechanical property. The solid polymer substrate electrolyte membrane is prepared by one step method of volatile solvent, has simple preparation technique, higher ion electrical conductivity and electrical and chemical stability, has good mechanical performance and heat stability, and can be applied to the preparation of second lithium ion cells.

Description

technical field [0001] The invention relates to a solid polymer electrolyte applicable to lithium ion batteries and a preparation method thereof, in particular to a hyperbranched polyether type solid polymer electrolyte material and a preparation method thereof. Background technique [0002] Polymer solid electrolyte, that is, a polymer complex formed by polymers and inorganic salts with ion conductivity, has the characteristics of good reliability, no leakage, and easy molding, and maintains the basic characteristics of polymers. The application in lithium-ion batteries has attracted widespread attention, and scholars at home and abroad have launched research work on new polymer electrolytes. At present, the polymer electrolyte systems that have been studied more mainly include PEO, PAN, PMMA, PVDF, PVC, etc. Among them, the electrolyte system polyoxyethylene (PEO) has always attracted attention because of its structural characteristics of easy ion conduction. However, the...

Claims

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Application Information

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IPC IPC(8): C08L71/02C08L101/00C08K5/435H01M10/40
CPCY02E60/122
Inventor 吴锋冯婷吴川白莹
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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