Sodium ion electrochemical capacitor

An electrochemical and capacitor technology, applied in the field of capacitors, can solve the problems of high cost and limited content, achieve high energy density and power density, good cycle life, and reduce costs.

Active Publication Date: 2013-07-10
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium is a rare metal in nature, and its content is limited, so the cost of this type of capacitor is very high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Dissolve 0.4g of sodium molybdate in 40ml of distilled water and sonicate for 0.5h, adjust the pH to 1.2 with 1M HCl and 1MNaOH, inject it into a 50ml stainless steel reaction kettle, heat it at 160°C for 24h, and cool it down to room temperature naturally. Then wash and centrifuge with distilled water for 3 times, wash and centrifuge with absolute ethanol for 3 times, and finally vacuum dry at 60° C. for 10 h to obtain molybdenum oxide nanobelts.

[0041] Molybdenum oxide in the following examples was prepared from Example 1.

Embodiment 2

[0043] Dissolve 1 g of commercially available titanium dioxide and tetrabutyl titanate in 80 ml of 10 M sodium hydroxide solution, stir at room temperature for 3 hours, then transfer to a 100 ml reactor, and heat at 150°C for 48 hours. After hydrothermal cooling to room temperature, the product was transferred to 1000 ml of secondary water and washed to pH 7-8. After drying at 60°C, it was calcined at high temperatures of 300°C, 400°C, 500°C and 600°C for 5 hours. Label the uncalcined sodium titanate nanotubes as T 0 , the sodium titanate nanotubes calcined at 300 °C are marked as T 1 , the sodium titanate nanotubes calcined at 400 °C are marked as T 2 , the sodium titanate nanotubes calcined at 500 °C are marked as T 3 , the sodium titanate nanotubes calcined at 600 °C are marked as T 4 .

[0044] Rigaku D / max-IIB diffractometer was adopted, Cu target Kα ray was used as X-ray source, the scanning range was 5°~60°, and the scanning speed was 1° / min. According to the PDF d...

Embodiment 3

[0048] 6mgT 1 ~T 4 , coke, molybdenum sulfide, molybdenum oxide and niobium oxide mixed with 3 mg of conductive adhesive and coated on the stainless steel battery collector net to form a film, dried in vacuum at 180 ° C for 3 hours, then transferred to an anhydrous oxygen-free argon-saturated In the glove box, respectively, T 1 ~T 4 , coke, molybdenum sulfide, molybdenum oxide and niobium oxide as the positive electrode, metal sodium as the negative electrode, 1.5M sodium perchlorate organic solution as the electrolyte, a polyethylene film and a glass fiber as the diaphragm, assembled into a button battery , Under the operating voltage of 0.1 ~ 2.5V for charge and discharge test.

[0049] Figure 8 It is the charge-discharge specific capacity curve of sodium titanate single electrode, Figure 8 The middle curve is T 1 The single-electrode charge-discharge specific capacity curve, the curve is T 2 The single-electrode charge-discharge specific capacity curve, the ▲ curve...

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Abstract

The invention provides a sodium ion electrochemical capacitor which comprises a positive pole, a negative pole, an electrolyte, and a membrane arranged between the positive pole and the negative pole, wherein the negative pole of the sodium ion electrochemical capacitor is made of coke or molybdenum sulfide or molybdenum oxide or niobium oxide or sodium titanate, and the electrolyte is an organic solution of neutral sodium salt. The five negative pole materials are all of layered structures, so sodium ions in the electrolyte can be intercalated and released from the surfaces of negative pole materials, and namely a redox reaction is generated. Interlamellar spacing of the negative pole materials is large, rapid intercalation and releasing of the sodium ions with large sizes are benefited, accordingly energy density and power density of the sodium ion electrochemical capacitor are improved, and the cycle life of the sodium ion electrochemical capacitor is prolonged. Meanwhile, the negative pole of the sodium ion electrochemical capacitor is made of the coke or the molybdenum sulfide or the molybdenum oxide or the niobium oxide or the sodium titanate, and the electrolyte is the organic solution of the neutral sodium salt, so cost of the capacitor is effectively reduced.

Description

technical field [0001] The invention relates to the field of capacitors, in particular to a sodium ion electrochemical capacitor. Background technique [0002] Electrochemical capacitors are also called supercapacitors. Supercapacitors are composed of positive electrodes, negative electrodes, electrolytes, and a diaphragm between the positive and negative electrodes. It is a new type of electrochemical energy storage and conversion device. Compared with ordinary capacitors, it has Higher Faraday ratio capacitance and energy density; compared with batteries, it has the characteristics of high power density, short charge and discharge time, good cycle performance, long service life and easy maintenance. Electrochemical capacitors have the dual functions of traditional capacitors and batteries, their power density is much higher than that of ordinary batteries, and their energy density is much higher than that of traditional capacitors, thus filling the gaps in these two tradit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/62
CPCY02E60/13
Inventor 王宏宇殷娇齐力郑程赵立平高继超
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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