Lithium ion capacitor and preparation method thereof

Abstract

The invention belongs to the technical field of electric energy storage equipment, and particularly relates to a lithium ion capacitor and a preparation method thereof. The lithium ion capacitor comprises a positive electrode plate, a negative electrode plate, a diaphragm and an electrolyte. The positive electrode plate comprises a positive electrode current collector and a positive electrode material, wherein the positive electrode material is composed of a positive electrode active material and a CMC binder, and the positive electrode active material is composed of a porous graphene / conductive polymer / metal oxide ternary nano composite material. The negative electrode plate comprises a negative electrode current collector, a negative electrode material and a lithium strip, wherein the negative electrode material is composed of a negative electrode active material and a CMC binder, and the negative electrode active material is composed of a composite material obtained by carrying outsurface pore forming on spherical natural graphite or graphitized polyimide carbon microspheres, then carrying out nitriding treatment and finally carrying out in-situ growth on carbon nanotubes or nano metal nitrides. The invention solves the problem that the electrolyte on the negative electrode plate cannot be in full contact with a pre-embedded lithium, provides a new corrosion process of theelectrode material and the porous aluminum foil, and achieves the purpose of improving the performance of a lithium ion capacitor.

Description

technical field [0001] The invention belongs to the technical field of electric energy storage equipment, and in particular relates to a lithium ion capacitor and a preparation method thereof. Background technique [0002] Lithium-ion capacitors are a typical asymmetric capacitor. The positive electrode of this capacitor uses capacitive materials, and the negative electrode uses battery materials with pre-intercalated lithium. During the charging and discharging process, ion adsorption / desorption occurs at the positive electrode, and lithium ion deintercalation process occurs at the negative electrode. Due to the relatively low charge and discharge voltage of the negative electrode battery material, the working voltage range of the entire lithium-ion capacitor is much higher than that of the traditional symmetrical electric double layer supercapacitor, so that the lithium-ion capacitor has a higher energy density. [0003] At present, lithium-ion capacitors have problems su...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a lithium ion capacitor and its preparation method to solve the problem that the electrolyte on the negative plate cannot fully contact with the pre-intercalated lithium. The present invention also provides new electrode materials and porous aluminum foil Advanced corrosion process to improve the performance of lithium-ion capacitors

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