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Ionic liquid compound electrolyte material

A composite electrolyte and ionic liquid technology, which is used in the manufacture of hybrid capacitor electrolytes, non-aqueous electrolyte batteries, and electrolyte batteries, can solve problems such as gas-liquid leakage, potential safety hazards, and restricting the high-power performance of new batteries and capacitors.

Inactive Publication Date: 2010-06-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The liquid electrolyte widely used at present has the advantage of high conductivity, but because it contains flammable and volatile organic solvents, it releases flammable gases during charging and discharging, especially under certain unconventional working conditions (such as high power Charge and discharge, overcharge and overdischarge, etc.) to generate a lot of heat will accelerate the generation of gas, resulting in increased internal pressure of the battery, gas and liquid leakage, and even fire and explosion, so there is a serious safety hazard
At the same time, the liquid electrolyte system also has disadvantages such as poor thermal stability and high freezing point. The conductivity drops sharply at low temperature, and the electrolyte is easy to decompose and deteriorate at high temperature.
These problems have seriously restricted the development of new batteries and capacitors, especially high-power performance.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] Dry organic borate lithium (a) and 1,3-nitroxan-2-one and put them in a glove box. Weigh 15g and 45g samples respectively and mix them in a weighing bottle, and stir thoroughly at room temperature A homogeneous liquid is formed and an ionic liquid is obtained. The melting point measured by DSC2010 differential scanning calorimeter is -5℃; the conductivity (25℃) measured by CHI660a electrochemical workstation using AC impedance method is 1.25mS / cm.

[0020] Based on the good electrochemical and thermal properties of the above-mentioned ionic liquid, it is combined with a porous polyoxyethylene membrane, and the conductivity can reach 0.23mS / cm at room temperature at 25°C; the conductivity of the sample at different temperatures is measured, and the conductivity changes with temperature The curve relationship conforms to the Arrhenius equation.

Embodiment 2

[0022] Dry organic borate lithium (b) and 1,3-nitroxan-2-one and put them in a glove box. Weigh 15g and 45g samples respectively and mix them in a weighing bottle, and stir thoroughly at room temperature A homogeneous liquid is formed and an ionic liquid is obtained. The melting point measured by DSC2010 differential scanning calorimeter is -32℃; the conductivity (25℃) measured by CHI660a electrochemical workstation using AC impedance method is 2.4mS / cm.

[0023] Based on the good electrochemical and thermal properties of the above-mentioned ionic liquid, it is compounded with a porous polyoxyethylene membrane, and the conductivity can reach 0.8mS / cm at room temperature at 25℃; the conductivity of the sample at different temperatures is measured, and the conductivity changes with temperature The curve relationship conforms to the Arrhenius equation.

Embodiment 3

[0025] Based on the good electrochemical and thermal properties of the ionic liquid prepared in Example 2, it is compounded with a polyacrylonitrile membrane, and the conductivity can reach 0.65mS / cm at room temperature at 25°C; the conductivity of the sample at different temperatures is measured, and the conductivity varies with The relationship of the temperature curve conforms to the Arrhenius equation.

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Abstract

The invention relates to an ionic liquid compound electrolyte material. Organic lithium borate / lithium aluminate and organic compound having the structure of carbamic acid ester compose the ionic liquid material which is used as a substrate, the composition and ratio of lithium salt to organic compound of the ionic liquid system are adjusted, and addition reaction with high molecular material and organic solvent is carried out to prepare all-solid-state or gel state polymer compound electrolyte. The electrolyte material has excellent thermostability, broad electrochemical window and high ion conductivity, is superior to existing non-aqueous organic liquid electrolyte applied to commercialized lithium ion battery especially in the aspect of safety, and has wide application prospect in lithium ion battery, electrochemical super capacitor, etc.

Description

Technical field [0001] The invention belongs to the technical field of electrolyte materials, and is mainly oriented to applications in the technical fields of high-power, high-energy-density power batteries, lithium ion batteries, electrochemical supercapacitors, lithium-sulfur batteries and other high-energy batteries and electronic equipment. technical background [0002] Ionic liquid is a liquid composed entirely of ions. It is a salt that is liquid at low temperatures (<100°C) and is generally composed of organic cations and inorganic anions. In recent years, ionic liquids, as green solvents, have received extensive attention in organic and polymer synthesis, and in-depth research has been carried out in electrochemistry. Compared with traditional organic solvents and electrolytes, ionic liquids have a series of outstanding advantages: (1) almost no vapor pressure, non-volatile; colorless and odorless; (2) has a large stable temperature range, better Chemical stability a...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCY02E60/12Y02E60/13H01G11/56Y02P70/50
Inventor 陈人杰吴锋李丽张蓉谢曼陈实王国庆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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