Polymer electrolyte, preparation method thereof and battery comprising polymer electrolyte

A polymer and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low room temperature conductivity and low lithium ion migration number, achieve room temperature conductivity and lithium ion migration number increase, improve structure, The effect of preventing agglomeration

Active Publication Date: 2012-06-20
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a polymer electrolyte with high room temperature conductivity and lithium ion migration number and its preparation method in order to overcome the defects of polymer electrolytes in the prior art with low room temperature conductivity and lithium ion migration number and batteries comprising the polymer electrolyte

Method used

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Examples

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preparation example Construction

[0022] The present invention also provides a method for preparing a polymer electrolyte, wherein the method comprises contacting a solution containing metal ions with a solution containing sulfide ions in the presence of polyethylene oxide, uniformly mixing the contacted product with a lithium salt, The uniformly mixed product is formed into a film, and the metal ion is a metal ion of a water-insoluble metal sulfide.

[0023]In the preparation method provided by the present invention, in the presence of polyethylene oxide, the conditions for contacting the solution containing metal ions with the solution containing sulfide ions include that the contact temperature is preferably 40-60°C, and the contact time is preferably 5-60°C. 12 hours. In the present invention, there is no limit to the order of addition between polyethylene oxide, the solution containing metal ions and the solution containing sulfide ions, as long as the contact between the solution containing metal ions an...

Embodiment 1

[0037] This example is used to illustrate the polymer electrolyte provided by the present invention and its preparation method.

[0038] (1) Add 0.1 mole of copper acetate to 0.15 liters of acetonitrile, then stir at 200 rpm, add copper acetate to the copper acetate solution at a molar ratio of 1:16 to the oxyethylene structural unit in polyethylene oxide The number average molecular weight of 5×10 6 Polyethylene oxide (purchased from Zhangjiagang Huateng Chemical Co., Ltd.), and then the mixture was heated to 50° C., and kept stirring at this temperature for 7 hours.

[0039] (2) Add 0.13 moles of sodium sulfide to 0.15 liters of acetonitrile, then add the prepared sodium sulfide solution to the mixed solution prepared in (1) under full of nitrogen, and at a speed of 200 rpm Stirring at 50° C. for 8 hours produces water-insoluble metal sulfides uniformly distributed in polyethylene oxide with a particle diameter of 60 nm.

[0040] (3) Add 0.05 moles of LiPF 6 and 0.1 mol o...

Embodiment 2

[0043] This example is used to illustrate the polymer electrolyte provided by the present invention and its preparation method.

[0044] (1) Add 0.1 mole of tetraammine copper sulfate to 0.35 liters of distilled water, and then stir at 200 rpm, with the molar ratio of copper acetate and polyethylene oxide structural units in polyethylene oxide being 1:10 to Copper acetate solution is added with number average molecular weight of 1.01×10 6Polyethylene oxide (purchased from Zhangjiagang Huateng Chemical Co., Ltd.), and then the mixture was heated to 50° C., and kept stirring at this temperature for 7 hours.

[0045] (2) Add 0.1 mole of sodium sulfide to 0.05 liters of distilled water, then add the prepared sodium sulfide solution to the mixed solution prepared in (1) under full of nitrogen, and at a speed of 200 rpm Stirring at 40° C. for 12 hours produced water-insoluble metal sulfides uniformly distributed in polyethylene oxide with a particle diameter of 100 nm.

[0046] (3...

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Abstract

The invention provides a polymer electrolyte. The polymer electrolyte comprises polyethylene oxide, lithium salt and a doping agent, wherein the doping agent is non-water-soluble metal sulfide. The invention also provides a method for preparing the polymer electrolyte and a polymer battery comprising the polymer electrolyte, wherein the method for preparing the polymer electrolyte comprises the steps of: contacting solution containing metal ions with the solution containing sulfur ions in the presence of the polyethylene oxide; mixing a product obtained after the contact and the lithium salt uniformly; and performing film formation on the product obtained after the uniform mixing, wherein the metal ions are the metal ions of the non-water-soluble metal sulfide. In the invention, the room temperature conductivity and the lithium ion transference number of the polymer electrolyte are remarkably increased by using the non-water-soluble metal sulfide as the doping agent.

Description

technical field [0001] The invention relates to a polymer electrolyte, a preparation method of the polymer electrolyte, and a battery including the polymer electrolyte. Background technique [0002] The research on solid polymer electrolytes began in 1973 with the discovery of the conductivity of polyethylene oxide and alkali metal ion complexes by Wright et al. (D.E.Fenton, J.M.Parker, P.V.Wright, Polymer, 1973, 14, 589). By 1979, French Armand et al. (J.M.Tarascon, M.Armand, Nature, 2001, 414, 359) found that the polyoxyethylene alkali metal salt complex had an ion conductivity of 10 at 40-60°C. -5 Siemens / cm, and the complex has good film-forming properties and can be used as an electrolyte for lithium-ion batteries. [0003] However, the easy crystallization caused by the structure of polyethylene oxide itself makes it difficult to transport lithium ions in it, and generally its room temperature ion conductivity can only reach 10. -7 -10 -8 Siemens / cm is of the order ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L71/02C08K3/30C08K3/24C08K3/32C08K3/38C08K5/435C08K5/42C08J5/18H01M10/40
Inventor 张利
Owner BYD CO LTD
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