Low-temperature electrolyte taking ethyl fluoroacetate as solvent and application of low-temperature electrolyte

A technology for substituting ethyl acetate and electrolyte, which is applied in the field of electrochemistry, can solve the problems of limited practical application, limited temperature range of secondary batteries, and low energy density of low-temperature batteries, and achieves increased oxidation stability, excellent oxidation stability, The effect of lowering the binding energy

Pending Publication Date: 2020-11-17
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the commercialization of secondary batteries, they have been widely used in more and more fields, but with the continuous upgrading of requirements, such as special needs in military equipment, aerospace and other fields, the secondary batteries used today are becoming more and more are limited by the temperature range to meet these requirements
However, these low-temperature batteries cannot be charged and discharged at...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Under anhydrous and oxygen-free conditions, ethyl trifluoroacetate was used as a solvent, and lithium bis(trifluoromethylsulfonyl)imide was dissolved therein at a molar concentration of 0.5 mol / kg. The electrolyte temperature range is below -120°C. Using lithium manganese oxide (LMO) as the positive electrode material and metal lithium as the negative electrode material, the assembled button battery is charged and discharged at a rate of 0.1 C, and the capacity is 105mAhg at room temperature 25°C -1 , the capacity is 98mAhg at a low temperature of minus 40°C -1 , low temperature minus 80 ℃ capacity of 80 mAhg -1 . (See Table 1).

Embodiment 2

[0019] Example 2: Under anhydrous and oxygen-free conditions, ethyl trifluoroacetate was used as a solvent, and lithium bis(trifluoromethylsulfonyl)imide was dissolved therein at a molar concentration of 0.5 mol / kg. The lowest temperature range of the electrolyte is below -120°C. Using ternary nickel-cobalt-lithium manganese oxide (NMC) as the positive electrode material and metal lithium as the negative electrode material, the assembled button battery is charged and discharged at a rate of 0.1 C, and the capacity is 185mAhg at room temperature 25°C -1 , the capacity is 150mAhg at a low temperature of minus 40°C -1 , low temperature minus 80 ℃ capacity of 100 mAhg -1 . (See Table 1).

Embodiment 3

[0020] Example 3: Under anhydrous and oxygen-free conditions, ethyl trifluoroacetate was used as a solvent, and lithium bis(trifluoromethylsulfonyl)imide was dissolved therein at a molar concentration of 0.5 mol / kg. The lowest temperature range of the electrolyte is below -120°C. Lithium titanate (LTO) is used to test the performance of half-cells assembled with metal lithium, charged and discharged at a rate of 0.1C, and the capacity is 170mAhg at room temperature 25°C -1 , the capacity is 165mAhg at a low temperature of minus 40°C -1 , the capacity is 103mAhg 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 technical field of electrochemistry, and particularly relates to a low-temperature electrolyte taking ethyl fluoroacetate as a solvent and application of the low-temperature electrolyte. According to the low-temperature electrolyte, fluoroethyl acetate and derivatives thereof are used as solvents, lithium salt, sodium salt or quaternary ammonium salt is used as solutes, and the low-temperature electrolyte further comprises a cosolvent and an additive. Compared with the traditional electrolyte, the low-temperature electrolyte disclosed by the invention still shows higher ionic conductivity at lower temperature (minus 80 DEG C). Under the electron withdrawing action of fluorine atoms, fluoroethyl acetate and positive ions have lower desolvation energy, the desolvation process is promoted, and the intercalation and deintercalation of ions at the low temperature are facilitated. When the electrolyte provided by the invention is applied to a lithium ion battery,a sodium ion battery, a supercapacitor and a hybrid supercapacitor, the system shows excellent specific capacity, cycle performance and power performance at low temperature.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a low-temperature electrolyte and its application. Background technique [0002] As the speed of fossil energy consumption on the earth continues to accelerate, environmental problems have become increasingly prominent. Therefore, searching for an efficient, clean, safe and renewable new energy source has become a research focus of scientists from all over the world. Since the commercialization of secondary batteries, they have been widely used in more and more fields, but with the continuous upgrading of requirements, such as special needs in military equipment, aerospace and other fields, the secondary batteries used today are becoming more and more These requirements cannot be met due to the limited temperature range. For example, a lithium-ion battery can only release 12% of its rated capacity at room temperature under the condition of minus 40 degrees,...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0525H01M10/054H01G11/60
CPCH01M10/0569H01M10/0525H01M10/054H01G11/60H01M2300/0034Y02E60/13Y02E60/10
Inventor 董晓丽夏永姚杨洋
Owner FUDAN UNIV
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