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A Solvent Co-embedded Sodium Ion Capacitor

A technology of sodium ions and capacitors, which is applied in the field of electrochemical energy storage devices, can solve problems such as the impact of product batch consistency, unfavorable large-scale application, and energy density limitations, and achieve favorable rate performance, improved energy density, and stable performance. Effect

Active Publication Date: 2018-10-02
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The energy and product batch consistency have a significant impact, which is not conducive to large-scale application, and the sodium ion hybrid supercapacitor is used in an aqueous electrolyte, the upper limit of the charge and discharge voltage is only 1.7V, and the energy density is also limited.

Method used

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  • A Solvent Co-embedded Sodium Ion Capacitor
  • A Solvent Co-embedded Sodium Ion Capacitor
  • A Solvent Co-embedded Sodium Ion Capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Electrolyte preparation: In an argon-filled glove box, weigh 167.95 grams of sodium hexafluorophosphate (NaPF 6 ), then slowly add sodium hexafluorophosphate into a beaker containing 1 liter of diethylene glycol dimethyl ether (DEGDME) solvent under constant stirring, and form 1mol / L NaPF after completely dissolving 6 / DEGDME Electrolyte.

[0044] The production of the negative electrode sheet: the graphitized mesophase carbon microspheres, the conductive agent Super P, and the binder are in a mass ratio of 85:10:5 (the mass ratio of styrene-butadiene rubber emulsion in the binder: sodium carboxymethyl cellulose = 3.5:1.5) mixed and stirred evenly to form a slurry, and the slurry was evenly coated on the copper foil current collector with a porosity of 30% and a thickness of 15 μm. The size of the pole piece was 3cm×5cm, and the nickel strip was welded Ear.

[0045] Production of positive electrode sheet: Mix porous activated carbon, conductive agent Super P, and bin...

Embodiment 2

[0052]In Example 1, the solvent in the electrolyte was changed to tetraethylene glycol dimethyl ether, and the rest of the production process was the same as in Example 1.

[0053] Sodium ion capacitor charge and discharge test: After the pre-embedded sodium is completed, the positive electrode and the negative electrode form a loop, and the charge and discharge are carried out with a 1C rate current. The voltage range is 1~4V. The charge and discharge curve is shown in the attached figure 2 , the sodium ion capacitor has an energy density of 91.5Wh / kg based on the sum of the active materials of the two poles at a rate current of 1C; at a rate current of 40C, the energy density is 62.8Wh / kg; after 1000 times of charging and discharging at a rate current of 40C, The capacity retention rate was 96.5%.

Embodiment 3

[0055] In Example 1, the negative electrode material mesophase carbon microspheres were changed to modified natural graphite, and the rest of the manufacturing process was the same as in Example 1.

[0056] Sodium ion capacitor charge and discharge test: After the pre-embedded sodium is completed, the positive electrode and the negative electrode form a loop, and the charge and discharge are carried out with a 1C rate current. The voltage range is 1~4V. The charge and discharge curve is shown in the attached figure 2 , the energy density of the sodium ion capacitor based on the sum of the active materials of the two poles is as high as 113.8 Wh / kg at 1C rate current; at 40C rate current, the energy density is 70.3Wh / kg; after 1000 charge-discharge cycles at 40C rate current, The capacity retention rate was 97.5%.

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Abstract

The invention provides a solvent co-intercalated sodium ion capacitor comprising an anode, a cathode, a sodium auxiliary electrode, an electrolyte, and a diaphragm between the anode and the cathode. The concentration of the electrolyte is between 0.5 and 3mol / L. A solvent is selected from one or more of a group including diethanol dimethyl ether, tetraethanol dimethyl ether, and tetrahydrofuran. The electrolyte positive ions in the electrolyte are sodium ions. The negative ions in electrolyte are hexafluorophosphate, tetrafluoroborate, triflate, and perchlorate. The diaphragm is biomass cellulosic material and has 10 to 100 micrometers of thickness, 30% to 95% of porosity, and 20 to 200 nanometers of average diameters. The solvent used in the electrolyte and the sodium ions can be co-intercalated into graphite-kind cathode material and a problem is effectively solved that sodium ions cannot be intercalated into the graphite-kind cathode material in a conventional esters solvent. The biomass cellulosic diaphragm material improves the ionic conductivity of the electrolyte so as to further improve the large-current charging and discharging capability of the sodium ion capacitor, and is low in cost. The sodium ion capacitor is simple in production process, high in specific energy, good in cyclic stability, and has good application prospect in the field of new energy.

Description

technical field [0001] The invention relates to an electrochemical energy storage device, in particular to a solvent co-embedded sodium ion capacitor. Background technique [0002] In the global trend of attaching great importance to climate change and energy conservation and carbon reduction, the new energy industry has become one of the strategic emerging industries in the new century. As an important support and auxiliary technology for the new energy industry, energy storage devices have attracted the attention of all parties. In our country, with the pure [0003] The rapid development of electric vehicles and hybrid vehicles, the steady advancement of smart grids, the growth of renewable energy such as wind and solar [0004] With the large-scale grid connection and the increase of regional peak load, various application problems also appear, which have great impact on the energy density and function of energy storage devices. [0005] Rate density, service life and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/62H01G11/52
CPCY02E60/13
Inventor 崔光磊姚建华韩鹏献韩晓琪
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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