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Ultralow-temperature electrolyte solution as well as preparation method thereof, battery using ultralow-temperature electrolyte solution and preparation method thereof

An electrolyte and ultra-low temperature technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve the problems of increased battery internal resistance and low battery capacity retention, and achieves reduced internal resistance, reduced interface charge transfer impedance, and excellent Effects of Energy Density and Power Density

Inactive Publication Date: 2018-11-13
闫博
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The first two points above can be attributed to the modification of the electrolyte. The current research can only be very limited to improve the problem that the internal resistance of the battery increases significantly at low temperatures, especially in the case of high-rate charge and discharge (1C). The problem of low capacity retention rate has not been significantly improved

Method used

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  • Ultralow-temperature electrolyte solution as well as preparation method thereof, battery using ultralow-temperature electrolyte solution and preparation method thereof
  • Ultralow-temperature electrolyte solution as well as preparation method thereof, battery using ultralow-temperature electrolyte solution and preparation method thereof
  • Ultralow-temperature electrolyte solution as well as preparation method thereof, battery using ultralow-temperature electrolyte solution and preparation method thereof

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preparation example Construction

[0031] figure 1 A schematic flow chart of the preparation method of the ultra-low temperature electrolyte provided by the present invention, such as figure 1 As shown, the preparation method of the ultra-low temperature electrolyte includes: setting the viscosity at 0~2.0 Between, or dielectric constant ≥ 30 An aqueous solution, as a solvent; will have a solubility in water ≥ 3 Metal salt of metal salt, as electrolyte salt; Add electrolyte salt in solvent; Stir and mix well, obtain mass concentration and be 3~25 of electrolyte.

[0032] The ultra-low temperature electrolyte prepared by the preparation method of the ultra-low temperature electrolyte provided by the present invention includes: adding electrolyte salt in the solvent, and the obtained mass concentration is 3 ~ 25 electrolyte solution; wherein: the solvent is: the viscosity is 0~2.0 Between, or dielectric constant ≥ 30 single solvent, or a mixed solvent thereof; the electrolyte salt is: solubility in t...

Embodiment 1

[0038] First of all, in this embodiment one: the solvent is deionized water, and the electrolyte salt is lithium trifluoromethanesulfonate (LiOTf); secondly, in the fume hood, the quantitative trifluoromethanesulfonic acid Dissolve lithium in deionized water, stir for 30 minutes, and configure 1-11 Electrolyte solution to obtain electrolyte solution system 1.

[0039] In this example 1, the solid phase temperature of the obtained electrolyte system 1 is analyzed by differential scanning calorimetry (DSC), and it can be known that its solid phase temperature is -86°C; Table 1 (conductivity in mS / cm).

[0040]

[0041] It can be seen from the data in the table that in the electrolyte system 1 provided in the present embodiment 1, when the molar mass is 5 , the electrolyte has the highest conductivity.

Embodiment 2

[0043] First, in the second embodiment: the solvent is deionized water, and the electrolyte salt is lithium bis(trifluoromethanesulfonyl)imide (LiTFSI); Lithium (trifluoromethanesulfonyl)imide was dissolved in deionized water, stirred for 30 minutes, and configured as 3-14 electrolyte solution to obtain electrolyte solution system 2.

[0044] In this example 2, the solid phase temperature of the obtained electrolyte system 2 is analyzed by differential scanning calorimetry (DSC), and it can be known that the solid phase temperature is -86°C; Table 2 (conductivity in mS / cm).

[0045]

[0046] It can be seen from the data in the table that in the electrolyte system two provided in this embodiment two, when the molar mass is 8 , the electrolyte has the highest conductivity.

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Abstract

The invention belongs to the technical field of battery electrolyte solutions, and specifically relates to an ultralow-temperature electrolyte solution as well as a preparation method thereof, a battery using the ultralow-temperature electrolyte solution and a preparation method thereof. The invention aims to provide the ultralow-temperature electrolyte solution as well as the preparation method thereof, the battery using the ultralow-temperature electrolyte solution and the preparation method thereof, which can perform large-multiplying-power charging and discharging under an ultralow-temperature environment. According to the technical scheme adopted by the invention, the ultralow-temperature electrolyte solution is obtained as follows: electrolyte salt is added into a solvent to obtain the electrolyte solution with mass concentration of 3-25 mol / kg, wherein the solvent is an aqueous solution with viscosity of 0-2.0 Pa.s, or a dielectric constant being greater than or equal to 30 C<2> / MM<2>; and the electrolyte salt is metal salt with solubility being greater than or equal to 3 mol / kg.

Description

technical field [0001] The invention belongs to the technical field of battery electrolyte, and in particular relates to an ultra-low temperature electrolyte and a preparation method thereof, a battery using the ultra-low temperature electrolyte and a preparation method thereof. Background technique [0002] With the energy crisis brought about by the excessive development and utilization of fossil fuels, various metal ion secondary batteries, especially lithium ion secondary batteries, have gradually become new energy fields due to their advantages of high energy density, flexibility, portability and long service life. The most promising energy storage technology. [0003] However, although lithium-ion has been successfully applied to various fields of life, there are application obstacles in some fields with extremely low temperature environments, such as aerospace, deep-sea exploration, and North and South Pole exploration; at low temperatures, the energy density of lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569
CPCH01M10/0569Y02E60/10
Inventor 不公告发明人
Owner 闫博
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