Adhesive-free graphene/silicon electrode for lithium ion battery and preparation method thereof

Abstract

The invention discloses an adhesive-free graphene/silicon electrode for a lithium ion battery and a preparation method thereof. The adhesive-free graphene/silicon electrode comprises a graphene/silicon multilayer structure layer and a copper foil and is prepared through the following steps of: 1, preparing a graphite oxide solution; 2, preparing a graphene colloid; 3, carrying out surface modification treatment on the copper foil; 4, preparing the adhesive-free graphene/silicon electrode: dispersing silicon into deionized water, adding a surface active agent, and uniformly carrying out ultrasonic dispersion; adding the graphene colloid, and carrying out ultrasonication and stirring for uniform dispersion to obtain graphene/silicon mixed slurry; uniformly coating the graphene/silicon mixed slurry on the treated copper foil by using a film coating machine; carrying out vacuum drying, and then carrying out cold pressing treatment to prepare the adhesive-free graphene/silicon electrode with a very good adhesion effect. The adhesive-free graphene/silicon electrode prepared through the method disclosed by the invention has the advantages of high active substance and copper foil bonding force, high capacity, good circulating stability, no need of adhesive usage, simple process and easiness for industrial large-scale production.

Description

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AI Technical Summary

Benefits of technology

This patented technology provides an improved method for making a stable and efficient electric double layer capacitor (EDLC). It uses carbon nanotubes instead of traditional metal particles with poor electron transfer properties due to their size limitations during manufacturing processes. By adding certain chemicals like alkali metals or ammonia into this mixture, the resulting EDL can have better electronic conduction than previous methods without these substances added. Additionally, there are several ways to improve its bonding strength when used together with silver flakes. Overall, this new technique allows for more effective energy storage compared to current techniques.

Problems solved by technology

Layer capacitors based on Li ion technology require advanced materials like Lithium Iron Battery (LIB) or Silicon Carbon Anode (SiCA)). These materials offer better characteristics than existing ones: they allow more flexibility in terms of design parameters, longer lifetimes compared to previous generators, less volatile gases released upon charging, and improved durability over time without losing their ability to absorb water vapor. Additionally, these materials show promise in applications requiring larger amounts of stored energy, including hybrid fuel cells.

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