Lithium-ion capacitor lithium intercalation method

Abstract

The present invention discloses a lithium-ion capacitor lithium intercalation method belonging to the manufacturing technology field of the lithium-ion capacitor. Activated carbon slurry is attached onto a perforated aluminum foil to prepare an anode; an anode current collector is filled with lithium-rich compounds to take as a third pole; hard carbon materials are attached onto the perforated aluminum foil to prepare a cathode; the cathode, a membrane, the anode and a membrane are stacked or winded in order to form an electric core, the current collectors of the anode and the cathode are welded with the pole ears of the anode and the cathode, and then the parallel welding is performed, and the organic solution including lithium salt is injected from a liquid injection port; the cathode and the anode are respectively connected with the anode and the cathode, of a charging and discharging tester for charging so as to complete the lithium intercalation of the cathode; and the activating treatment is performed. The lithium-ion capacitor lithium intercalation method can solve the problem of long lithium intercalation time, the cathode lithium intercalation process is controllable, the lithium-ion capacitor lithium intercalation method is helpful for the circulation of the capacitor products, the manufacturing cost is high, the technology process is simplified, the production process is safe, and the lithium-ion capacitor lithium intercalation method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of manufacturing lithium ion capacitors, in particular to a method for inserting lithium into lithium ion capacitors. Background technique [0002] Lithium-ion capacitor is a new type of hybrid energy storage device that combines lithium-ion batteries and electric double-layer supercapacitors. It has the advantages of high specific energy of lithium-ion batteries and high specific power and long life of supercapacitors. It is used in military aerospace, Green energy and other fields have broad application prospects. At present, the lithium insertion method of lithium ion capacitors generally adopts the method in Fuji Heavy Industries' invention patent CN101138058B, that is, lithium metal is used as a lithium source, and a metal foil with a through hole is used as a current collector, and the lithium metal is placed in a position opposite to the negative electrode. Connect the lithium metal to the negative e...

AI Technical Summary

Problems solved by technology

This method can obtain large-capacity and large-scale electric storage devices with high energy density and output power, and has good charge and discharge characteristics, but there are the following problems: (1) The chemical properties of lithium foil are extremely active, making the production of lithium ion capacitors more demanding on the environment. Very high; (2) The amount of lithium needs to be precisely controlled. Too little lithium will not achieve the expected effect on voltage improvement, and too much lithium will cause a large safety hazard in the monomer, so the consistency of the monomer is poor; (3) The manufacturing process of lithium-ion capacitors is complicated, and the cost of raw materials and manufacturing costs remain high

[0003] Chinese patent CN104681311A discloses that the short-circuit discharge lithium intercalation method of short-circuiting the negative electrode and lithium metal is changed to charging and discharging the battery cell in the electrolyte to realize the lithium intercalation of the negative electrode, take out the battery cell and repackage the liquid injection, this method can protect lithium ions Lithium intercalation in the negative electrode of the capacitor monomer does not use lithium metal, and the process is relatively safe. However, the amount of lithium in the electrolyte is small, and it cannot provide enough lithium for the negative electrode. The repackaging process after lithium intercalation has high environmental requirements. complex and expensive to produce

However, the price of passivated lithium powder is high, and the preparation of passivated lithium-containing negative electrode by dry process is complex and cannot be mass-produced. After lithium metal is embedded in the carbon material on the negative electrode, gaps appear on the electrode, the conductivity decreases, and the active material is easy to fall off.

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