Negative pole piece, preparation method thereof and lithium ion capacitor based on negative pole piece

Abstract

The invention discloses a negative pole piece in the field of capacitors, the negative pole piece comprises a negative current collector, and a first active material layer and a second active material layer which sequentially coat the negative current collector, the first active material layer comprises a first active material, and the second active material layer comprises a second active material; the first active substance is at least one of soft carbon, hard carbon, graphite and a silicon carbon material; the second active substance is at least one of graphene, activated carbon, foamy carbon and carbon aerogel. According to the scheme, through the combination of the first active material layer and the second active material layer, the electrolyte transmission pressure under high power can be effectively relieved, the polarization internal resistance is reduced, and the circulation attenuation caused by insufficient electrolyte is reduced.

Description

technical field [0001] The invention belongs to the field of lithium ion capacitors, and in particular relates to a negative electrode sheet, a preparation method thereof and a lithium ion capacitor based thereon. Background technique [0002] Lithium-ion batteries and supercapacitors are two types of representative energy storage devices with different energy storage principles and their own characteristics. Lithium batteries have high energy density but low power density, while supercapacitors have high power density but low energy density. Going beyond the energy storage limit of the above two types of energy storage devices and developing energy storage devices with both high energy density and high power density is a very challenging problem in the field of chemical energy storage. In terms of technical principles, lithium-ion batteries and supercapacitors have different charging and discharging mechanisms. How to rationally design and integrate the two to obtain a new...

AI Technical Summary

Problems solved by technology

However, since the two materials of the negative electrode sheet are both lithium battery negative electrode materials, the battery characteristics of the material are mainly used, so it cannot break through the limit of the dynamic performance of the lithium ion battery charge and discharge process.

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