Method for lithium pre-embedment of negative electrode of lithium ion capacitor

A lithium ion and capacitor technology, applied in the field of lithium ion capacitors, can solve the problems of low capacity characteristics and large volume specific energy, and achieve the effect of improving capacity characteristics, increasing volume specific energy and wide application range

Inactive Publication Date: 2016-07-27
SICHUAN MEIJIABAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for pre-embedding lithium in the negative electrode of lithium ion capacitors, so as to solve the problems of large volume specific energy and low capacity characteristics of existing lithium ion capacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of negative electrode active slurry: 85% by weight of the negative electrode active material natural graphite, 10% by weight of conductive agent carbon black and 5% by weight of the binder polyvinylidene fluoride are mixed, After high-speed stirring, press to form a negative electrode active slurry layer with a thickness of 200 um.

[0037] The negative electrode active slurry layer prepared above is electrostatically adsorbed on a copper foil with a pore size of 10um, and pressed to make a negative electrode sheet. After cutting and welding the tabs, a layer of 1um thick lithium foil to make lithium-intercalable negative electrode sheets.

[0038] The above-mentioned lithium-intercalable negative electrode sheet, activated carbon positive electrode and diaphragm are wound and formed in combination and packaged inside the casing, and after being injected with an organic electrolyte solution containing lithium ions, the lithium-ion capacitor is assembled.

...

Embodiment 2

[0041] Preparation of negative electrode active slurry: 70% by weight of negative electrode active material hard carbon, 25% by weight of conductive agent graphene and 5% by weight of binder polyvinylidene fluoride are mixed, After high-speed stirring, press to form a negative electrode active slurry layer with a thickness of 100 um.

[0042] The negative electrode active slurry layer prepared above is electrostatically adsorbed on a copper grid with a pore size of 50um, and pressed to make a negative electrode sheet. After cutting and welding the tabs, a layer of 5um thick lithium foil is attached to the back , to produce a lithium-intercalable negative electrode sheet.

[0043] The above-mentioned lithium-intercalable negative electrode sheet, micro-region graphitized material positive electrode and diaphragm are laminated and packaged in the casing, and after being injected with an organic electrolyte solution containing lithium ions, the lithium ion capacitor is assembled....

Embodiment 3

[0046] Preparation of negative electrode active slurry: mixing 80% by weight of negative electrode active material mesophase carbon microspheres, 17% by weight of conductive agent carbon nanotubes and 3% by weight of water-based binder , and then add water, after high-speed stirring, a 500um thick negative electrode active slurry layer is formed.

[0047] The negative electrode active slurry layer prepared above is electrostatically adsorbed on a copper foil with a pore size of 100um, and pressed to make a negative electrode sheet. After cutting and welding the tabs, a layer of 3um thick lithium foil to make lithium-intercalable negative electrode sheets.

[0048] The above-mentioned lithium-intercalable negative electrode sheet, the lithium-containing metal oxide carbon positive electrode and the separator are combined to be wound and packaged inside the casing, and after being injected with an organic electrolyte solution containing lithium ions, the lithium-ion capacitor is...

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Abstract

The invention relates to the field of a lithium ion capacitor, in particular to a method for lithium pre-embedment of a negative electrode of the lithium ion capacitor. The method comprises the following steps of preparing active paste of the negative electrode, and applying the paste onto a porous copper foil through which lithium ions can pass to prepare a negative pole plate; attaching a layer of low-cost lithium-containing material lithium sheet or a lithium foil on the back surface of the negative pole plate to prepare the negative pole plate capable of lithium embedment; preparing the lithium ion capacitor by the negative pole plate capable of lithium embedment; and enabling the lithium sheet attached onto the back surface of the negative electrode to be spontaneously embedded into a negative electrode material during the formation of the capacitor so as to complete the lithium pre-embedment of the negative electrode of the lithium ion capacitor. The method is simple and convenient, is low in cost and has very important significance to industrial production of the lithium ion capacitor.

Description

technical field [0001] The invention relates to the field of lithium ion capacitors, in particular to a method for pre-embedding lithium in the negative electrode of the lithium ion capacitor. Background technique [0002] In recent years, with the rapid growth of energy demand, new green energy storage devices have attracted more and more attention as the core of the national energy strategy development; Lithium-ion capacitors are an emerging green energy storage device, and its positive electrode adopts the same super Electric double-layer energy storage carbon materials similar to capacitors, the negative electrode uses lithium-intercalable materials similar to lithium-ion batteries, so it has the advantages of large capacity, high voltage, high power, long service life, etc., and is known as "the next generation of super Capacitor". [0003] In the process of preparing lithium-ion capacitors, the pre-intercalation lithium technology of the negative electrode is the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/50
CPCY02E60/13H01G11/86H01G11/50
Inventor 任洪波刘祝英
Owner SICHUAN MEIJIABAO NEW ENERGY TECH CO LTD
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