A novel composite electrolyte material

A composite electrolyte and electrolyte technology, which is applied in the application field of high-energy battery and electronic equipment technology field, can solve the problems of poor thermal stability, high freezing point, and potential safety hazards of liquid electrolyte system, and achieve good electrochemical performance, good thermal stability, The effect of a large liquid range

Inactive Publication Date: 2004-11-17
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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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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  • A novel composite electrolyte material
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  • A novel composite electrolyte material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] LiN(CF 3 SO 2 ) 2 After drying with acetamide, put it into the glove box (the content of water is less than 1ppm), weigh 20gLiN(CF 3 SO 2 ) 2 And 30g of acetamide in a weighing bottle, after stirring at room temperature, it becomes a transparent liquid, forming a molten salt at room temperature. Its thermal properties were measured with a DSC2010 (TA company, USA) differential scanning calorimeter, and its melting point was -60°C.

[0047] Put this sample into the platinum bright conductivity electrode (Russell, Shanghai), use the CHI 660A (USA) type electrochemical workstation to adopt the AC impedance method to measure its conductivity in the range of 1Hz-100KHz, and its room temperature (25 ℃) conductivity It is 1.2mS / cm; combined with WD4005(F) high and low temperature box (Yinhe, Chongqing) to measure the conductivity of the sample at different temperatures, the relationship between the conductivity and temperature variation curve is in line with the VTF equat...

Embodiment 2

[0052] LiN(CF 3 SO 2 ) 2 After drying with ethylene urea, put it into the glove box (the content of water is less than 1ppm), weigh 20gLiN(CF 3 SO 2 ) 2 and 40g of acetamide in a weighing bottle, slowly heated to 50°C to melt it and turn it into a transparent liquid. After natural cooling, a low-temperature molten salt is formed. The sample is left standing at room temperature and remains liquid for a long time, which is a supercooled liquid. Its thermal properties were measured with a DSC2010 differential scanning calorimeter, and its melting point was 45°C.

[0053] Put the sample into the platinum bright conductivity electrode, use the CHI 660A electrochemical workstation to measure its conductivity in the range of 1Hz-100KHz by using the AC impedance method, and its room temperature (25°C) conductivity is 0.5mS / cm; and WD4005 The (F) type high and low temperature box is used to measure the conductivity of the sample at different temperatures, and the relationship bet...

Embodiment 3

[0058] LiClO 4 After drying with acetamide, put it into the glove box (the content of water is less than 1ppm), weigh 20gLiClO 4 And 30g of acetamide in a weighing bottle, after stirring at room temperature, it becomes a transparent liquid, forming a molten salt at room temperature. Its thermal properties were measured with a DSC2010 differential scanning calorimeter, and its melting point was -22°C.

[0059] Put the sample into the platinum bright conductivity electrode, use the CHI660A electrochemical workstation to measure its conductivity in the range of 1Hz-100KHz by using the AC impedance method, and its room temperature (25°C) conductivity is 2.6mS / cm; and WD4005 ( The F) type high and low temperature box is used to measure the conductivity of the sample at different temperatures, and the relationship between the conductivity and temperature variation curve conforms to the Arrhenius equation. The sample was loaded into a glass three-electrode electrochemical cell whos...

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Abstract

The invention is a kind of compound electrolyte which is based on new room temperature or low temperature fused salt (also named as ion liquid) material, and the organic solvent and polymer material are added in. the electrolyte has a good thermal stabilization, broad chemical window and high ion conducting performance, especially on aspect of safety, it is better than the liquid electrolyte in businesslike lithium ion battery. The invention adjusts the proportion and components of the negative and positive ion in the fused salt, and adds in the organic solvent and polymer, the room temperature and low temperature fused salt electrolyte, the gel polymer electrode, the solid polymer electrode and so on can be acquired, the invention has a broad prospect in lithium ion battery and electrochemical super capacitance aspects.

Description

technical field [0001] The invention belongs to the technical field of electrolytes, and is mainly oriented to applications in the technical fields of lithium-ion batteries, electrochemical supercapacitors, fuel cells, photovoltaic cells and other high-energy batteries and electronic equipment. technical background [0002] Room temperature molten salt is a liquid composed entirely of ions. It is a liquid salt at low temperature (<100°C), also known as ionic liquid (Ionic Liquids), which 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, odorless; (2) have a larger stable temperature range, better Chemical stabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/00H01B1/12H01G9/022H01M10/40
CPCY02E60/122
Inventor 吴锋陈人杰梁宏莹单忠强陈实王国庆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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