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High-energy high-power density lithium ion supercapacitor and assembling method thereof

A supercapacitor, high power density technology, applied in the direction of capacitors, electrolytic capacitors, liquid electrolytic capacitors, etc., can solve the problems of power density limitation, difficulty in reaching the energy storage level of secondary batteries, etc., achieve high power density, increase energy density, The effect of high power density

Active Publication Date: 2014-03-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with traditional supercapacitors, due to the use of lithium-ion battery electrode materials based on bulk energy storage, the power density of lithium-ion supercapacitors is greatly limited, and the capacity decays rapidly during high-current charging and discharging; at the same time, lithium-ion supercapacitors The energy density of ionic supercapacitors is also limited by the low specific capacitance of the electrodes of electric double layer capacitors, so it is still difficult to reach the energy storage level of secondary batteries

Method used

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  • High-energy high-power density lithium ion supercapacitor and assembling method thereof
  • High-energy high-power density lithium ion supercapacitor and assembling method thereof
  • High-energy high-power density lithium ion supercapacitor and assembling method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Graphene (oxygen content 6.5at%, specific surface area 412m 2 / g) Make positive and negative electrode sheets, and electrochemically pre-insert lithium on two graphene electrode sheets. The positive electrode is discharged at a constant current to 1.16V relative to metal lithium and the voltage is maintained for more than 12 hours; the negative electrode is charged and discharged in a constant current cycle at 0.01~1.16V relative to metal lithium, until the charge and discharge capacity remains stable, and finally discharge at a constant current To the vicinity of 1.16V relative to lithium metal and hold the pressure for more than 12 hours. The positive and negative electrode sheets with pre-inserted lithium are assembled into a sandwich structure lithium ion supercapacitor.

[0028] The energy storage performance of lithium ion supercapacitors and their positive and negative electrodes after pre-insertion of lithium on the electrodes is as follows figure 1 As shown in (b)...

Embodiment 2

[0031] Hierarchical porous carbon (10.5at% oxygen content, specific surface area 1169m 2 / g, medium / large pores accounted for 68%) were made into positive and negative electrode sheets, and the two graphene electrode sheets were electrochemically pre-inserted with lithium. The positive electrode is discharged at a constant current to 1.22V relative to lithium metal and the voltage is maintained for more than 12h; the negative electrode is charged and discharged in a constant current cycle at 0.01~1.22V relative to metal lithium, until the charge and discharge capacity remains stable, and finally discharge at a constant current To the vicinity of 1.22V relative to metal lithium and keep the pressure for more than 12h. The positive and negative electrode sheets with pre-inserted lithium are assembled into a sandwich structure lithium ion supercapacitor.

[0032] Such as image 3 The constant current charge and discharge curves of the hierarchical pore carbon-based lithium ion super...

Embodiment 3

[0034] Multi-walled carbon nanotubes (diameter 2 / g, oxygen content 4.5at%) were made into positive and negative electrode sheets, and the two graphene electrode sheets were electrochemically pre-inserted with lithium. The positive electrode sheet is discharged at a constant current to 1.12V relative to the metal lithium and the pressure is maintained for more than 12 hours; the negative electrode sheet is charged and discharged at a constant current cycle at 0.01~1.12V relative to the metal lithium until the charge and discharge capacity remains stable, and finally discharge at a constant current To the vicinity of 1.12V relative to lithium metal and hold the pressure for more than 12 hours. The positive and negative electrode sheets with pre-inserted lithium are assembled into a sandwich structure lithium ion supercapacitor.

[0035] Such as Figure 4 The constant current charging and discharging curves of the multi-wall carbon nanotube-based lithium ion supercapacitor shown at...

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Abstract

The invention discloses a high-energy high-power density lithium ion supercapacitor and an assembling method thereof and belongs to the technical field of electrochemical energy storage devices. In order to greatly improve the energy density of the lithium ion supercapacitor, non-graphitic carbon materials with a certain oxygen-containing functional groups are used as positive and negative electrodes, after the electrodes are embedded in advance, a lithium salt organic electrolyte solution is used as an electrolyte solution, and the lithium ion supercapacitor is assembled. According to the design and assembling mode, the positive and negative electrodes can be always positioned in the most suitable potential interval in the operating process of a device, and the characteristics of high specific capacity and high power of the non-graphitic carbon materials are exerted to the greatest degree. Moreover, an available voltage window of the electrolyte can be fully utilized, so that the operating voltage of the device reaches an upper limit of decomposition voltage of the electrolyte, and the energy density and power density of the lithium ion supercapacitor are greatly improved.

Description

Technical field [0001] The invention relates to the technical field of electrochemical energy storage devices, in particular to a lithium ion supercapacitor with high energy and high power density and an assembly method thereof. Background technique [0002] As an energy storage device, supercapacitors have the characteristics of high power, short charging time, long service life, wide operating temperature range, and high safety performance. They can be used as high-power pulse power sources in wind and solar power generation, hybrid electric vehicles, and heavy machinery. , Standby power, portable electronic products and other fields have very broad development prospects. According to different energy storage mechanisms, supercapacitors are divided into electric double layer capacitors and pseudocapacitor capacitors. The former mainly relies on the physical electrostatic adsorption of electrolyte ions on the electrode surface to store energy, and the latter mainly relies on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042H01G9/035H01G9/145
CPCY02E60/13
Inventor 李峰翁哲成会明王大伟闻雷
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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