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Lithium ion capacitor and preparation method thereof

A technology of capacitors and lithium ions, which is applied in the field of capacitors and can solve problems such as harsh lithium-intercalation environment requirements, inability to promote industrial applications, uneven lithium-intercalation, etc.

Active Publication Date: 2021-12-07
SHANDONG ENERGY GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, electrochemical pre-intercalation of lithium is only suitable for laboratory research, and external and internal pre-intercalation of lithium have not been able to be applied in industry due to problems such as uneven lithium intercalation and strict requirements on the lithium intercalation environment.

Method used

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  • Lithium ion capacitor and preparation method thereof
  • Lithium ion capacitor and preparation method thereof
  • Lithium ion capacitor and preparation method thereof

Examples

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preparation example Construction

[0061] The present invention provides a kind of preparation method of lithium ion capacitor described in above-mentioned technical scheme, comprises the following steps:

[0062] Mix the negative electrode active material, conductive carbon black and polyvinylidene fluoride, add N-methylpyrrolidone to adjust the viscosity, and then coat it on the copper foil current collector to obtain the negative electrode sheet; pre-prepare the negative electrode sheet in the aromatic lithium compound Lithiation to obtain a pre-lithiated negative electrode sheet;

[0063] Mix the positive electrode active material, conductive carbon black and sodium alginate, add water to adjust the viscosity, and then coat it on the aluminum foil current collector to obtain the positive electrode sheet;

[0064] The pre-lithiated negative electrode sheet and the positive electrode sheet are assembled to obtain a lithium ion capacitor.

[0065] In the present invention, the aromatic lithium compound is pre...

Embodiment 1

[0078] The preparation steps of the rod-shaped magnesium oxide template are as follows:

[0079] Step (1) Na 2 CO 3 and MgCl 2 ·6H 2 O is configured as a 1mol / L solution;

[0080] Step (2) gets the Na of 100ml respectively 2 CO 3 solution and MgCl 2 solution, the Na 2 CO 3 The solution was slowly added to the MgCl 2 solution, and stirred evenly, and then it was left to stand for 6 hours to filter and collect the filter cake after the reaction was completed, washed with deionized water for 3-5 times, and dried in a blast drying oven;

[0081] Step (3) The collected product was calcined in air at a rate of 5° C. / min to 550° C. for 2 hours to obtain a rod-shaped magnesium oxide template.

Embodiment 2

[0083] The preparation steps of the hierarchical porous structure magnesium oxide template are as follows:

[0084] Take 2 g of the rod-shaped magnesium oxide template prepared in Preliminary Example 1, add it to 400 ml of deionized water and stir it evenly, leave it to stand for a period of time at room temperature, then filter, and dry the filter cake in a blast drying oven Dry;

[0085] The collected product was calcined in the air at a rate of 5° C. / min to 550° C. for 2 hours to obtain a magnesium oxide template with a hierarchical porous structure.

[0086] figure 1 For the SEM figure of the template prepared in preliminary example 1 and preliminary example 2, wherein, a is the SEM figure of the rod-shaped porous magnesium oxide template prepared in preliminary example 1; b is the SEM of the hierarchical porous magnesium oxide template prepared in preliminary example 2 figure; from figure 1 It can be seen from the figure that the magnesium oxide reacted in water presen...

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Abstract

The invention provides a lithium ion capacitor and a preparation method thereof. The capacitor comprises a positive pole piece and a negative pole piece; the negative pole piece comprises a negative active material; the positive pole piece comprises a positive active material; the negative electrode active material is a petroleum asphalt-based rodlike porous carbon material prepared from a rodlike magnesium oxide template; and the positive electrode active material is a petroleum asphalt-based graded porous carbon material prepared from a magnesium oxide template with a graded porous structure. The porous carbon material adopted in the positive and negative pole pieces has excellent lithium storage capacity and shows relatively high specific capacity, so the lithium ion capacitor has relatively high energy density. And the material also has higher power density and excellent cycling stability.

Description

technical field [0001] The invention belongs to the technical field of capacitors, in particular to a lithium ion capacitor and a preparation method thereof. Background technique [0002] In order to reduce the dependence on non-renewable energy, the development and utilization of new energy has become the direction of future energy development, especially in recent years people have achieved remarkable results in the development and utilization of wind energy, solar energy and water energy. However, due to the intermittent and fluctuating characteristics of new energy sources, it is difficult to be directly integrated into the grid for use. Therefore, it is urgent to develop high-performance energy storage devices to store these energies. Lithium-ion batteries are widely used in mobile phones, notebooks, electric vehicles and other fields due to their high energy density, but their low power density limits their development in the field of fast charging; on the contrary, su...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/32H01G11/50H01G11/06H01G11/84
CPCH01G11/24H01G11/32H01G11/50H01G11/06H01G11/84Y02E60/13
Inventor 胡涵覃海权刘昭斌邢涛晁会霞刘海燕徐倩韩嘉李智张奎同
Owner SHANDONG ENERGY GRP
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