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

A lithium-ion battery and ionic liquid technology, which is applied in the field of gel-type ionic liquid/polymer electrolyte and its preparation, can solve the problems of poor compatibility of negative electrode materials, and achieve the effects of good compatibility, low toxicity, and flexible packaging

Inactive Publication Date: 2010-01-27
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 problem of poor compatibility between current imidazole ionic liquids and lithium-ion

Method used

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

Examples

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Example Embodiment

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

[0011] The ionic conductivity of the electrolyte of this embodiment is as high as 0.53×10 -3 S / m, good thermal stability and wide electrochemical stability 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, and realize battery all-solid structure and residual liquid. Very few, encapsulate flexible purpose. The electrolyte of this embodiment has good compatibility with the lithium titanate negative electrode, and the lithium ion battery manufactured with it has a specific capacity of 480mAh / g for the first charge at a rate of 0.1C, which is ...

Example Embodiment

[0012] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass ratio of the high molecular polymer to the imidazole ionic liquid is 1:1.2-1.8. Others are the same as the first embodiment.

Example Embodiment

[0013] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the mass ratio of the high molecular polymer to the imidazole ionic liquid is 1:1.5. Others are the same as the first embodiment.

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Abstract

The invention discloses a lithium ion battery gel type ionic liquid/polymer electrolyte and a preparation method thereof, relating to a gel type ionic liquid/polymer electrolyte and a preparation method thereof. The invention solves the problem of poor compatibility of the prior imidazole ionic liquid and a lithium ion battery cathode material. The electrolyte is made of a macromoleclar polymer, imidazole ionic liquid and lithium salt. The method comprises the following steps: 1. dissolving the macromoleclar polymer into organic solvent; 2. adding the imidazole ionic liquid and stirring till the solution is uniform; 3. adding the lithium salt to obtain gel liquid; 4. pouring the gel liquid into a die, drying in vacuum and demolding. The electrolyte has favorable compatibility with a lithium titanate cathode; a lithium ion battery made of the electrolyte has high safety, and the lithium titanate cathode presents ultrahigh specific capacity (more than a double of the theoretical specific capacity) and two charging and discharging platforms in the electrolyte. The invention has simple method and technology, low cost and convenient operation.

Description

technical field [0001] The invention relates to a gel-type ionic liquid / polymer electrolyte and a preparation method thereof. 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, non-flammability, large heat capacity, wide electrochemical window and less self-discharge, and are used as a new green alternative to volatile organic solvents. Solvents have attracted widespread attention. In recent years, it can be used as a gel electrolyte for lithium-ion batteries, and it also shows good prospects in eliminating the safety hazards of 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 / m order of magnitude, and the compatibility between ionic liquid and electrode material is not good, it is difficult for electrode materia...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/38
Inventor 安茂忠崔闻宇杨培霞张锦秋
Owner HARBIN INST OF TECH
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