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Lithium ion capacitor negative electrode pre-lithiation method, composite negative electrode and lithium ion capacitor

A lithium ion and capacitor technology, applied in the field of energy storage, can solve the problems of excessive lithium supplementation, unfavorable long-term cycling of capacitors, and long pre-lithiation time.

Active Publication Date: 2020-12-29
CHINA ENERGY LITHIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The metal lithium foil is dense, and the electrolyte cannot pass through to reach between the negative electrode and the lithium foil layer, and can only penetrate from the edge of the lithium foil layer to the middle, so the pre-lithiation time is long
In addition, gas will be generated during the pre-lithiation process, and these generated gases will accumulate between the negative electrode and the lithium foil, causing the two to separate so that the pre-lithiation process is partially or completely stopped, and the purpose of pre-lithiation cannot be achieved.
In addition, when metal lithium foil is used for negative electrode lithium supplementation, since the thickness of metal lithium foil is difficult to control below 20 microns (otherwise the thickness is uneven or wrinkled), the amount far exceeds the required lithium supplementation amount, resulting in excessive lithium supplementation , and excessive lithium supplementation, lithium precipitation will occur during the charging process, which is not conducive to the long-term cycle of the capacitor

Method used

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  • Lithium ion capacitor negative electrode pre-lithiation method, composite negative electrode and lithium ion capacitor
  • Lithium ion capacitor negative electrode pre-lithiation method, composite negative electrode and lithium ion capacitor
  • Lithium ion capacitor negative electrode pre-lithiation method, composite negative electrode and lithium ion capacitor

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preparation example Construction

[0079] figure 1 A schematic diagram of a process for preparing a through-hole lithium film according to the present invention is shown. Such as figure 1 As shown, using the carrier strip 01 and the metal lithium strip 02 as raw materials, the unwinding equipment is used for unwinding, and the unwinding equipment includes at least a metal lithium strip unwinding roller 11 and a metal lithium strip for supporting unwinding. Two unwinding support rolls 12 of the lithium strip and the load strip; the raw material lithium strip 02 and the load strip 01 enter the rolling mill 20 after passing through the unwinding support roll 12; the rolling mill 20 includes at least a pair of rolls 21 and the Anti-sticking coating 22, the rolling pressure of described rolling mill 20 and the roll gap gap between rolls 21 can be fine-tuned; One or more of them, such as materials, ceramics, etc.; through pressure compounding, the carrying strip and lithium material are compounded together to form ...

Embodiment 1

[0085] A 50-micron thick polyethylene film is used as the supporting layer, and the unwinding and winding device is assisted, and the lithium film thickness is 5 microns (the thickness tolerance is ±0.5 microns) covered with the supporting layer. Porous lithium film, the rolling process such as figure 1 As shown, the obtained lithium film structure covered with the loading layer is as follows figure 2 shown. Among them, the through-hole lithium film has a relatively complete film shape, and the film has relatively uniformly distributed pinhole-shaped (through the film) through holes, the size of the holes is 5-50 microns, and the hole spacing is 5-100 microns.

Embodiment 2

[0087] 1. List of materials

[0088]

[0089] 2. Preparation of positive and negative electrodes

[0090] 2.1. Preparation of positive electrode sheet

[0091] Weigh each substance according to the ratio of activated carbon:PVDF:AB=8:1:1, and add a certain mass of NMP, so that the solid content of the slurry is 30%. At room temperature, stir magnetically for 8 hours at about 800 r / min. Coat the stirred slurry on aluminum foil, dry it at 80 degrees Celsius for 12 hours, and then punch it into a circular positive electrode sheet with a diameter of 15mm. The surface density of activated carbon in the electrode sheet is about 7.8mg / cm 2 .

[0092] 2.2. Preparation of negative electrode sheet and composite negative electrode sheet

[0093]The preparation process of the negative pole piece is the same as the preparation process of the positive pole piece. The specific process is: according to the ratio of mesocarbon microspheres: PVDF: AB = 8:1:1, each material is weighed, an...

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Abstract

The invention provides a lithium ion capacitor negative electrode pre-lithiation method, a composite negative electrode and a lithium ion capacitor. The lithium ion capacitor negative electrode pre-lithiation method comprises steps of 1, preparing a lithium ion capacitor negative electrode and a through hole lithium film with a supporting layer; 2, superposing the through-hole lithium film with the supporting layer with the negative electrode in a manner that one side of the through-hole lithium film is in contact with the surface of the negative electrode, and transferring the through-hole lithium film to the surface of the negative electrode through pressure compounding; and 3, separating the supporting layer, and collecting the negative electrode attached with the lithium film to obtainthe composite negative electrode of the lithium ion capacitor. 4, stacking or winding the composite negative electrode, the positive electrode and the diaphragm together according to the structure ofthe composite negative electrode, the diaphragm and the positive electrode; and 5, injecting an electrolyte, packaging, and carrying out pre-lithiation to obtain the lithium ion capacitor with the pre-lithiated negative electrode.

Description

technical field [0001] The invention relates to the technical field of energy storage, in particular to a method for pre-lithiation of a negative electrode of a lithium ion capacitor, a composite negative electrode and a lithium ion capacitor. Background technique [0002] Lithium-ion capacitor is a new type of capacitor, which has the structural characteristics of electric double layer capacitor and lithium ion battery. Compared with traditional electric double layer capacitor, it has more advantages in energy density, high temperature characteristics and self-discharge. Ion batteries have better rate performance and safety, and have been used in wind power generation, uninterruptible power system (UPS) and other fields, and are expected to be used in new energy vehicles and electronic equipment in the future. The positive pole of the lithium-ion capacitor is the positive pole of the electric double layer capacitor (such as activated carbon), the negative pole is the negati...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/06H01G11/24H01G11/26H01G11/50
CPCH01G11/86H01G11/06H01G11/24H01G11/26H01G11/50Y02E60/13
Inventor 刘承浩王亚龙孙兆勇孔德钰陈强牟瀚波
Owner CHINA ENERGY LITHIUM
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