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Lithium ionic cell gel type ion liquid / polymer electrolyte and preparation thereof

A lithium-ion battery, ionic liquid technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of short cycle time of imidazole-based ionic liquids and electrode materials, and achieve a wide electrochemical window, high conductivity, Easy to operate effect

Inactive Publication Date: 2009-05-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the short cycle time problem of current imidazole ionic liquids and electrode materials

Method used

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  • Lithium ionic cell gel type ion liquid / polymer electrolyte and preparation thereof
  • Lithium ionic cell gel type ion liquid / polymer electrolyte and preparation thereof
  • Lithium ionic cell gel type ion liquid / polymer electrolyte and preparation thereof

Examples

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specific Embodiment approach 1

[0010] Specific embodiment one: In this embodiment, the gel-type ionic liquid / polymer electrolyte of the lithium-ion battery is made of a high molecular polymer, an imidazole ionic liquid and a lithium salt, wherein the mass ratio of the high molecular polymer to the imidazole ionic liquid is 1:1-2, the mass ratio of imidazole ionic liquid to lithium salt is 0.01-6:1.

[0011] The ion conductivity of the electrolyte of the present invention is high, up to 2.99×10 -3 S cm -1 , good thermal stability and wide electrochemical window, it can be used in lithium-ion batteries with high capacity, and can also eliminate the safety hazards of liquid lithium-ion batteries to a large extent. flexible purpose. The electrolyte of the present invention has good compatibility with the lithium titanate negative electrode, and the lithium-ion battery manufactured with it has good safety and stable cycle performance under different magnifications. After repeated cycle tests, the specific capa...

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment differs from Embodiment 1 in that the mass ratio of the polymer to the imidazole-based ionic liquid is 1:1.2-1.8. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Embodiment 3: This embodiment differs from Embodiment 1 in that the mass ratio of the polymer to the imidazole-based ionic liquid is 1:1.5. Others are the same as in the first embodiment.

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Abstract

The invention discloses a gel type ionic liquid / polymer electrolyte for a lithium ion battery and a preparation method thereof, and relates to a gel type ionic liquid / polymer electrolyte and a preparation method thereof. The invention solves the problem of short cycling time of the prior imidazole ionic liquid and electrode material. The electrolyte is prepared from macromolecular polymers, the imidazole ionic liquid and lithium salt. The method comprises: firstly, dissolving the macromolecular polymers into an organic solvent; secondly, adding the imidazole ionic liquid into a mixture, and stirring the mixture until the mixture is uniform; thirdly, adding the lithium salt into the mixture and obtaining a gel liquid; and fourthly, pouring the gel liquid into a die and performing vacuum drying and demolding. The electrolyte has good compatibility with a cathode of lithium titanate; the lithium ion battery prepared by the electrolyte has good safety and stable cycling performance under the condition of different multiplying factors, so as to have long cycling time; and the method has the advantages of simple technique, convenient operation and low cost.

Description

technical field [0001] The invention relates to a gel-type ionic liquid / polymer electrolyte. Background technique [0002] Ionic liquids (also known as room temperature molten salts, RTIL for short) have the advantages of good electrical conductivity, low vapor pressure, no flammability, large heat capacity, wide electrochemical window and less self-discharge, as a new type of green solvent that can replace volatile organic solvents It has aroused widespread concern, and in recent years, it has also shown good prospects as an electrolyte for lithium-ion batteries in eliminating potential safety hazards in lithium-ion batteries. However, the outstanding problem of gel-type ionic liquid / polymer electrolyte used in lithium-ion batteries is the low ion conductivity, usually less than 10 -3 S cm -1 The order of magnitude, and the compatibility of ionic liquids and electrode materials is not good, and it is difficult for electrode materials to show ideal lithium intercalation an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08L27/20C08L71/00C08L79/04C08L33/12C08K5/52C08K5/3445C08K5/55C08K5/435C08K3/32C08K3/38C08K3/24H01M10/40
Inventor 安茂忠崔闻宇杨培霞
Owner HARBIN INST OF TECH
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