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

A lithium-ion battery, binder-free technology, applied in the direction of battery electrodes, non-aqueous electrolyte storage battery electrodes, electrode manufacturing, etc., can solve the problems of unsuitable for large-scale industrial production, lack of electrode conductivity, and difficulty in industrial production, etc., to achieve Good dispersion effect, improved capacity and cycle performance, low cost effect

Active Publication Date: 2015-05-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Embodiment 1

[0038] The present embodiment provides a kind of preparation method of binder-free graphene / silicon electrode for lithium ion battery, and concrete steps are as follows:

[0039] 1. Preparation of pre-oxidized graphite:

[0040] Add 39mL of concentrated sulfuric acid (98%) into a three-necked flask, then weigh 2.5g of potassium persulfate and 2.5g of phosphorus pentoxide and add them to the three-necked flask successively, mix well; then add 5g of natural flake graphite powder (325 mesh), Then place it in a constant temperature water bath and react for 6 hours under stirring at 80°C; slowly pour the reactant into a beaker filled with 700ml of deionized water for dilution, transfer the diluted liquid to a Buchner funnel for filtration, and wash until the filtrate The obtained filter cake was dried under vacuum at 100°C for 10 hours, and the obtained solid substance was pre-oxidized graphite.

[0041] Two, the preparation of graphite oxide solution:

[0042] Weigh 2.5g of pre-ox...

Embodiment 2

[0052] The present embodiment provides a kind of preparation method of binder-free graphene / silicon electrode for lithium ion battery, and concrete steps are as follows:

[0053] 1. Preparation of pre-oxidized graphite:

[0054] Mix 3g of natural flake graphite (100 mesh) with 2.5g of potassium persulfate and 2.5g of phosphorus pentoxide into a three-necked flask filled with 50mL of concentrated sulfuric acid (98%), mix well under magnetic stirring conditions, and then place at constant temperature In a water bath, react for 6 hours under stirring at 80°C; slowly pour the reactant into a beaker filled with 500ml deionized water for dilution, then filter and wash with a Buchner funnel until the filtrate becomes neutral; filter the cake in a vacuum Dry at 80°C for 20 hours, and the resulting solid substance is pre-oxidized graphite.

[0055] Two, the preparation of graphite oxide solution:

[0056] Take 2.5g of pre-oxidized graphite and 1.25g of sodium nitrate and add them to ...

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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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Claims

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Application Information

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Owner HARBIN INST OF TECH
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