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Low temperature electrolyte using ethyl acetate as solvent

An ethyl acetate and electrolyte technology, applied in the field of electrochemistry, can solve the problems of low temperature performance of batteries, decreased conductivity of electrolyte, hindered ion migration, etc., and achieves improved low temperature performance, good redox stability, and low melting point. Effect

Inactive Publication Date: 2016-11-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Affected by the freezing point of the organic solvent, the lower the temperature, the closer to the freezing point of the organic substances in the electrolyte, resulting in a semi-solidified state of the electrolyte at low temperatures, hindering the migration of ions in the electrolyte, so the low-temperature performance of the battery decreases
At present, organic solvents commonly used in battery electrolytes are carbonates. Although they have the advantages of high electrical conductivity and good compatibility with electrodes, at low temperatures (≤-20°C), some carbonate solvents are insufficient for electrolysis due to their high melting points. The conductivity of the liquid drops suddenly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Under anhydrous and oxygen-free conditions, ethyl acetate was used as a solvent, and lithium bis(trifluoromethylsulfonyl)imide was dissolved therein at a molar concentration of 2 mol / L. The electrolyte can withstand low temperature -80 ℃. With lithium manganese oxide (LMO) as the positive electrode material and lithium titanium phosphate (LTPO) as the negative electrode material, the assembled button battery is charged and discharged at a rate of 1C, and the capacity is 105mAhg at room temperature 25°C -1 , the capacity is 75mAhg at a low temperature of minus 40°C -1 , the capacity is 53mAhg at a low temperature of minus 80°C -1 (See Table 1).

Embodiment 2

[0020] Example 2: Under anhydrous and oxygen-free conditions, ethyl acetate was used as a solvent, and lithium bis(trifluoromethylsulfonyl)imide was dissolved therein at a molar concentration of 2 mol / L. The electrolyte can withstand low temperature -80 ℃. With lithium manganese oxide (LMO) as the positive electrode material and lithium titanate (LTO) as the negative electrode material, the button battery is assembled to charge and discharge at a rate of 1C, and the capacity is 105 mAhg at room temperature 25°C -1 , with a capacity of 74 mAhg at a low temperature of minus 40°C -1 , the capacity is 52 mAhg at a low temperature of minus 80°C -1 (See Table 1).

Embodiment 3

[0021] Example 3: Under anhydrous and oxygen-free conditions, ethyl acetate was used as a solvent, and lithium bis(trifluoromethylsulfonyl)imide was dissolved therein at a molar concentration of 2 mol / L. The electrolyte can withstand low temperature -80 ℃. Using polytriphenylamine (PTPAn) as the positive electrode material and polyimide (PI) as the negative electrode material, the assembled button battery is charged and discharged at a rate of 1C, and the capacity is 85mAhg at room temperature 25°C -1 , the capacity is 59mAhg at a low temperature of minus 40°C -1 , the capacity is 48mAhg at a low temperature of minus 80°C -1 (See Table 1).

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PUM

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Abstract

The invention belongs to the field of electrochemical investigation, and specifically provides a low temperature electrolyte using ethyl acetate as a solvent. The low temperature electrolyte uses the ethyl acetate and derivate organic solvent as the solvent, and uses lithium salts, sodium salts or quaternary ammonium salts as a solute, and also comprises additives. The ethyl acetate has a very low melting point, and is still liquid in the low temperature environment of -83 DEG C. Compared with the traditional electrolyte, the low temperature electrolyte provided by the invention still has a high ionic conductivity at a low temperature of -80 DEG C. By applying the electrolyte provided by the invention to a lithium ion battery, a sodium-ion battery, a supercapacitor or a mixed type supercapacitor, the system is excellent in specific capacity, cycle performance and power performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a low-temperature electrolyte suitable for lithium-ion batteries, sodium-ion batteries, supercapacitors and hybrid supercapacitors. Background technique [0002] Since the commercialization of secondary batteries, battery performance such as energy density, power density, high-rate discharge performance, and cycle performance have been significantly improved. With the continuous research and development of new materials and new technologies, batteries have been widely used in more and more fields. At the same time, the problem of poor adaptability of batteries to the application environment has become increasingly prominent. For example, the charge and discharge performance of lithium-ion batteries is poor in low temperature environments. Most batteries can only discharge 60-80% of their rated capacity when the temperature is lower than -20°C, and only 30% o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0525H01M10/054H01G11/60
CPCH01G11/60H01M10/0525H01M10/054H01M10/0569H01M2300/0028Y02E60/10Y02E60/13
Inventor 王永刚董晓丽夏永姚
Owner FUDAN UNIV
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