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Difunctional electrolyte and preparation method thereof

An electrolyte and dual-function technology, applied in the field of electrolyte, can solve problems not mentioned and achieve good compatibility

Inactive Publication Date: 2011-05-04
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An electrolyte that combines lithium salts and ammonium salts is used, but it is not mentioned that it has good compatibility with PC solvents and contains ODFB - Lithium and ammonium salts of type anionic groups

Method used

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  • Difunctional electrolyte and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 40% propylene carbonate (PC), dimethyl carbonate (DMC) 30% and 3% dimethyl sulfoxide (DMSO) respectively by weight, in water, oxygen content is lower than 1ppm (mass percentage content) In a glove box, mix well and make electrolyte solvent, then add electrolyte lithium salt LiODFB with a total amount of 1mol / L in batches, after the electrolyte is fully dissolved, add electrolyte ammonium salt TEAODFB with a total amount of 0.1mol / L , after the electrolyte is fully dissolved, leave it for 24 hours; that is, the bifunctional electrolyte solution of the present invention is obtained.

[0028] Supercapacitor cells were assembled as follows, using commercial olivine LiFePO 4and activated carbon, weighed in a weight ratio of 2:8 and mixed as positive electrode active materials. The positive electrode ingredients were mixed according to the weight ratio of active material: carbon black: binder = 80:12:8, uniformly coated on an aluminum foil current collector with a thick...

Embodiment 2

[0035] Take 50% propylene carbonate (PC), dimethyl carbonate (DMC) 20% and 1% dimethyl sulfoxide (DMSO) respectively by weight, in water, oxygen content is lower than 1ppm (mass percentage content) In a glove box, mix well and make electrolyte solvent, then add electrolyte lithium salt LiODFB with a total amount of 1mol / L in batches, after the electrolyte is fully dissolved, add electrolyte ammonium salt TEAODFB with a total amount of 0.05mol / L , after the electrolyte is fully dissolved, leave it for 24 hours; that is, the bifunctional electrolyte solution of the present invention is obtained. All the other are with embodiment 1.

[0036] According to the supercapacitor battery test, in the obtained dual-function electrolyte, within the working voltage range of 2.2-3.8V, the discharge current 1C capacity is 4Ah, and the 10C discharge capacity is maintained at 3.7Ah. After 100 cycles of 1C charge and discharge, Capacity retention >94%.

[0037] According to the lithium-ion ba...

Embodiment 3

[0040] Take 50% propylene carbonate (PC), dimethyl carbonate (DMC) 15%, ethyl methyl carbonate 10% and 4% diethylene glycol dimethyl ether (DG) respectively by weight, in water, oxygen In a glove box with a content of less than 1ppm (mass percentage content), fully mix and evenly prepare an electrolyte solvent, and then add a total amount of 1mol / L electrolyte lithium salt LiODFB in batches, and after the electrolyte is fully dissolved, add a total amount of It is 0.05mol / L electrolyte ammonium salt TEAODFB, and after the electrolyte is fully dissolved, it is left for 24 hours; the bifunctional electrolyte solution of the present invention is obtained. All the other are with embodiment 1.

[0041] According to the supercapacitor battery test, in the obtained dual-function electrolyte, within the working voltage range of 2.2-3.8V, the discharge current 1C capacity is 4Ah, and the 10C discharge capacity is maintained at 3.7Ah. After 100 cycles of 1C charge and discharge, Capaci...

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Abstract

The invention relates to a difunctional electrolyte and preparation method thereof. The electrolyte is prepared by dissolving LiODFB, TEAODFB and additives to PC radical nonaqueous organic solvent. The PC radical nonaqueous organic solvent is one or multiple-solvent system at least containing propene carbonate, and ethylene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, propyl methyl carbonate, ethyl, methyl acetate, ethyl acetate, ethylene sulfite, propylene sulfite, acetonitrile, gamma-D lactone. The electrolyte of the invention has difunctional characteristic, which not only satisfies the request for the lithium ion battery by Li<+> chemical energy saving, but also satisfies the request for a super capacitor double electrode layer energy saving, at the same time being the difunctional electrolyte suitable for the super capacitor battery. The electrolyte is beneficial to promote the contribution for the energy and environment problem solution and provides a developing way for the electrolyte development.

Description

technical field [0001] The invention relates to an electrolyte solution for various electrochemical energy storage devices, in particular to an electrolyte solution for a supercapacitor battery and its preparation. Background technique [0002] The increasingly serious global environmental pollution and energy crisis have forced countries to find new sustainable energy sources. Green energy storage devices represented by lithium-ion batteries and supercapacitors have become the focus of attention and research hotspots. However, aerospace, national defense and military industry, electric vehicles, electronic information and instrumentation and other fields are in urgent need of energy storage devices with high energy density, high power density and long life, and lithium-ion batteries or supercapacitors alone are very good. It is difficult to meet these requirements at the same time. [0003] Supercapacitors rely on the interface electric double layer capacitance of the elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/038H01M10/38H01M10/40H01G11/62
CPCY02E60/10Y02E60/13Y02P70/50
Inventor 李劼张治安赖延清高宏权陈绪杰
Owner CENT SOUTH UNIV
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