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Negative electrode unit of a lithium ion capacitor and preparation method thereof, lithium ion capacitor

A capacitor and lithium ion technology, which is applied in the field of lithium ion capacitors, can solve the problems that the gas of the negative electrode sheet cannot be discharged in time, and the electrolyte cannot be fully contacted with the lithium sheet, so as to achieve good product consistency, reduce the probability of self-discharge, and improve utilization. rate effect

Active Publication Date: 2018-04-17
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a lithium ion capacitor negative electrode unit, to solve the problem that the electrolyte on the negative electrode sheet of the lithium ion capacitor in the prior art cannot fully contact with the lithium sheet and the gas on the surface of the negative electrode sheet cannot be discharged in time

Method used

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  • Negative electrode unit of a lithium ion capacitor and preparation method thereof, lithium ion capacitor
  • Negative electrode unit of a lithium ion capacitor and preparation method thereof, lithium ion capacitor
  • Negative electrode unit of a lithium ion capacitor and preparation method thereof, lithium ion capacitor

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Embodiment 1

[0036]The negative electrode unit of the lithium ion capacitor of the present embodiment includes a negative electrode sheet, and the negative electrode sheet includes a negative electrode current collector copper foil and a negative electrode active material layer coated on both surfaces of the negative electrode current collector. The agent Super P and the binder polyvinylidene fluoride (PVDF) are evenly mixed according to the mass ratio of 90:3:7. The thickness of the negative electrode sheet is 200 μm, and the surface of the negative electrode active material layer on both sides of the negative electrode sheet is covered with lithium mesh. The porosity of the net is 25%, the mass ratio of the lithium net to the negative active material is 0.05:1, and the overall laying area of ​​the lithium net is greater than the area of ​​the negative active material layer on the surface of the negative plate to completely cover the negative active material layer.

[0037] The preparation...

Embodiment 2

[0045] The negative electrode unit of the lithium ion capacitor of the present embodiment includes a negative electrode sheet, and the negative electrode sheet includes a negative electrode current collector copper foil and a negative electrode active material layer coated on both surfaces of the negative electrode current collector. The agent Super P and the binder polytetrafluoroethylene (PTFE) are evenly mixed according to the mass ratio of 86:5:9. The thickness of the negative electrode sheet is 200 μm, and the negative electrode active material layer on both sides of the negative electrode sheet is covered with lithium mesh. The porosity of the net is 50%, the mass ratio of the lithium net to the negative active material is 0.08:1, and the overall laying area of ​​the lithium net is greater than the area of ​​the negative active material layer on the surface of the negative plate to completely cover the negative active material layer.

[0046] The preparation method of the...

Embodiment 3

[0054] The negative electrode unit of the lithium ion capacitor of the present embodiment includes a negative electrode sheet, and the negative electrode sheet includes a negative electrode current collector copper foil and a negative electrode active material layer coated on both surfaces of the negative electrode current collector. Super P and mixed binder are evenly mixed according to the mass ratio of 90:3:7, and the mixed binder is made of styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC) according to the mass ratio of 5:3 , the thickness of the negative electrode sheet is 200 μm, and the surface of the negative electrode active material layer on both sides of the negative electrode sheet is covered with a lithium mesh, the porosity of the lithium mesh is 70%, and the mass ratio of the lithium mesh to the negative electrode active material is 0.1:1. The laying area is larger than the area of ​​the negative electrode active material layer on the surface of th...

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Abstract

The invention relates to a negative electrode unit of a lithium ion capacitor, a preparation method thereof, and a lithium ion capacitor, belonging to the technical field of lithium ion capacitors. The negative electrode unit of the lithium ion capacitor of the present invention includes a negative electrode sheet, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector, and the surface of the negative electrode active material layer is provided with a lithium network. The negative electrode unit of the lithium ion capacitor of the present invention adopts the arrangement of a lithium mesh on the surface of the negative electrode sheet, which can quickly infiltrate the electrolyte and the lithium mesh, fully contact the lithium mesh with the electrolyte, ensure that the negative electrode sheet is fully embedded with lithium, and generate The gas provides an "escape" channel, so that the gas can be discharged in time, avoiding the detachment of the lithium network from the negative electrode caused by the accumulation of gas on the surface of the negative electrode, and also avoiding the shedding of the negative active material, reducing the probability of self-discharge.

Description

technical field [0001] The invention relates to a negative electrode unit of a lithium ion capacitor, a preparation method thereof, and a lithium ion capacitor, belonging to the technical field of lithium ion capacitors. Background technique [0002] With the deepening of energy utilization, various energy storage devices such as lead-acid batteries, nickel-metal hydride batteries, lithium-ion batteries, etc. have achieved great development. With the rapid development of the electric vehicle market in recent years, the requirements for the energy density and power density of energy storage devices are also getting higher and higher. The energy density of traditional secondary batteries is high, but the power density is low, which cannot meet the power requirements of electric vehicles. The power requirements of the power supply, while the energy density of traditional capacitors is low, and it cannot meet the energy density requirements of electric vehicles for power supplie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/50H01G11/26H01G11/86H01G11/06
CPCY02E60/13
Inventor 平丽娜王栋梁李洪涛周志勇
Owner CALB CO LTD
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