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Sulfolane based binary sodium ion electrolyte and preparation method thereof

A technology of sulfolane and sodium ions, applied in electrolytes, secondary batteries, circuits, etc., can solve problems such as poor heat dissipation, potential safety hazards, and low boiling point, and achieve the effects of low price, good compatibility, and high cycle efficiency

Inactive Publication Date: 2016-07-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Most sodium-ion batteries use carbonate-based electrolytes, but carbonate-based electrolytes have disadvantages such as low boiling point, low flash point, flammability and volatility, and poor heat dissipation, which may easily cause safety hazards

Method used

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  • Sulfolane based binary sodium ion electrolyte and preparation method thereof
  • Sulfolane based binary sodium ion electrolyte and preparation method thereof
  • Sulfolane based binary sodium ion electrolyte and preparation method thereof

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preparation example Construction

[0031] The whole preparation process of the binary sodium ionic liquid is completed in a glove box filled with high-purity argon to ensure an environment of oxygen <0.1ppm and water <0.1ppm.

[0032] The assembly sequence of the CR2032 button battery is as follows: sequentially compress the negative electrode case, sodium sheet, fiber diaphragm, 4 to 5 drops of binary sodium ion electrolyte, stainless steel gasket, stainless steel shrapnel and positive electrode case; wherein, the fiber diaphragm Produced by Waterman (Whatman), its model is GF / D,

[0033] The thermal analysis adopts a thermogravimetric analyzer (TGA / SDTA851 / Swiss Mettler company), the sample quality is 5 mg, the protective gas atmosphere is nitrogen, and the heating rate is 10 °C min -1 , the final temperature is 600°C.

Embodiment 1

[0035] A sulfolane-based binary sodium ion electrolyte 0.2MNaPF 6 Preparation method and application of / TMS+PTSI:

[0036] (1) 0.5g p-toluenesulfonyl isocyanate (PTSI) and 9.164g sulfolane (TMS) are added in the reactor, mix well, obtain binary mixed solvent;

[0037] (2) 0.336g sodium hexafluorophosphate (NaPF 6 ) was added to the binary mixed solvent, stirred for 12h, and left to stand for 12h to obtain NaPF 6 Binary sodium ion electrolyte with a concentration of 0.2mol / kg, denoted as 0.2MNaPF 6 / TMS+PTSI electrolyte;

[0038] For the 0.2MNaPF 6 / TMS+PTSI electrolyte for thermal analysis, the thermogravimetric curve is as follows figure 2 It can be seen that 0.2MNaPF6 When the residual mass of / TMS+PTSI electrolyte is 90%, the temperature is higher than 120°C. Compared with the common carbonate electrolyte (50-70°C), the thermal stability is significantly improved;

[0039] The positive electrode active material Na 3 V 2 (PO4) 3 , the binder polyvinylidene fluorid...

Embodiment 2

[0041] A sulfolane-based binary sodium ion electrolyte 0.3MNaPF 6 Preparation method and application of / TMS+PTSI:

[0042] (1) 0.5g of PTSI and 8.996g of TMS are added to the reactor, and mixed evenly to obtain a binary mixed solvent;

[0043] (2) Add 0.504gNaPF 6 Added to the above-mentioned binary mixed solvent, stirred for 12h, and stood for 12h to obtain NaPF 6 Binary sodium ion electrolyte with a concentration of 0.3mol / kg, denoted as 0.3MNaPF 6 / TMS+PTSI electrolyte;

[0044] For the 0.3MNaPF 6 / TMS+PTSI electrolyte for thermal analysis, from its thermogravimetric curve, 0.3MNaPF 6 When the residual mass of / TMS+PTSI electrolyte is 90%, the temperature is higher than 120°C. Compared with the common carbonate electrolyte (50-70°C), the thermal stability is significantly improved;

[0045] The positive electrode active material Na 2 TiFe(CN) 6 , the binder polyvinylidene fluoride, and acetylene black are mixed evenly in a mass ratio of 7:1:2, and evenly coated on ...

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Abstract

The invention discloses a sulfolane based binary sodium ion electrolyte and a preparation method thereof, belonging to the technical field of a sodium ion battery. The binary sodium ion electrolyte comprises a binary mixed solvent and an electrolyte salt, wherein the binary mixed solvent comprises sulfolane and an ester additive or the sulfolane and an ionic liquid. The method comprises the following steps of uniformly mixing the sulfolane and the ester additive or the sulfolane and the ionic liquid in a certain environment to obtain the binary mixed solvent; and dissolving the electrolyte salt in the binary mixed solvent, and allowing the obtained mixture to stand to obtain the sulfolane based binary sodium ion electrolyte. The binary sodium ion electrolyte has the advantages of high thermal stability, wide electrochemical window and favorable room-temperature ionic conductivity, the selectable range of the current sodium ion battery electrolyte is expanded, and the sulfolane based binary sodium ion electrolyte is the sodium ion battery electrolyte with low cost and high safety and has wide application prospect in aspects such as the sodium ion battery and an energy storage sodium battery system.

Description

technical field [0001] The invention relates to a sulfolane-based binary sodium ion electrolyte and a preparation method thereof, belonging to the technical field of sodium ion batteries. Background technique [0002] At present, 70% of the world's total energy consumption still comes from fossil fuels (coal, oil, natural gas), which are also the main sources of air pollutants (nitrogen oxides, sulfur dioxide, smoke and greenhouse gases). In recent years, efficient, safe and clean new energy systems such as solar energy, geothermal energy, wind energy, ocean energy, biomass energy and nuclear fusion energy have gradually played an increasingly important role. These new energy sources have the characteristics of large total amount, low energy density, randomness, and intermittent nature, which make them difficult to use. Therefore, the development of efficient energy storage technology is the main effective way to solve the utilization rate of renewable energy. At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/054H01M10/0566H01M10/0567H01M10/0569
CPCH01M10/054H01M10/0566H01M10/0567H01M10/0569H01M2300/0037Y02E60/10
Inventor 陈人杰谢嫚刘凡黄永鑫吴锋李丽管沛林
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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