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A novel composite electrolyte material

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

Inactive Publication Date: 2007-06-27
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
  • A novel composite electrolyte material

Examples

Experimental program
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Effect test

Embodiment 1

[0019] 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.

[0020] 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

[0025] Based on the excellent electrochemical and thermal properties of room temperature molten salt prepared in Example 1, it was combined with polyvinylidene fluoride or vinylidene fluoride-hexafluoropropylene copolymer to form a composite electrolyte.

[0026] The preparation method is to add vinylidene fluoride-hexafluoropropylene copolymer particles to acetone to form a solution, then add the configured LiTFSI-acetamide electrolyte solution to the above solution, and mix thoroughly to make a gel polymer electrolyte solution. The gel polymer electrolyte solution was coated on the surface of the fabricated electrodes respectively, and then assembled in a supercapacitor simulated battery.

[0027] The supercapacitor has good thermal stability, high specific capacitance, good environmental stability and service life, no liquid leakage, is easier to assemble than a liquid electrolyte supercapacitor, and has no pollution to the environment.

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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 Patents(China)
IPC IPC(8): H01M10/40H01B1/00H01B1/12H01G9/022
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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