Ferrous carbonate/graphene composite material and preparation method and applications thereof

Abstract

The invention relates to the technical field of inorganic materials, and discloses a preparation method for a ferrous carbonate/graphene composite material. The preparation method comprises the steps of: I. mixing graphene materials, water-soluble ferrite, urea and water to form a suspension, wherein the mass ratio of the graphene materials to the water-soluble ferrite is (0.02-0.2):1, and the amount-of-substance concentration ratio of the urea to the water-soluble ferrite is (20-100):1; II. putting the suspension into a reaction kettle, controlling the temperature to be 100-180DEG C, and carrying out hydrothermal reaction for 4-12h to obtain the ferrous carbonate/graphene composite material. The invention further provides a lithium ion battery prepared by taking the ferrous carbonate/graphene composite material as a negative electrode material. By being synthesized through low-temperature hydrothermal reaction, the ferrous carbonate/graphene composite material is high in specific capacity and good in cycling performance, and has excellent development prospects after being applied to the negative electrode materials of the lithium ion battery.

Description

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AI Technical Summary

Benefits of technology

The present invention has the following technical effects: 1. The ferrous carbonate/graphene composite material has a high capacity and long cycle life, making it suitable for use as a negative electrode material in lithium-ion batteries. 2. The nano-sized ferrous carbonate/graphene material has a large surface area and small size, allowing for better electrolyte penetration and shorter lithium ion diffusion distance. This improves the specific lithium storage capacity of ferrous carbonate and enhances its electrochemical performance. 3. The low-temperature hydrothermal synthesis method used in the invention is easy to control, simple, and repeatable. 4. The raw materials used in the invention, including graphene, ferrous salt, and urea, are widely available and cost-effective.

Problems solved by technology

This patented technical problem addressed in the patents relates to finding better ways to make stronger cathodes used in secondary cells without losing their effectiveness due to volumetric expansions from repeated charges/dischargings. Current solutions like adding more expensive metals have limitations because they cannot completely fill all spaces inside them while still providing sufficient performance compared to traditional ones. To address these issues, researchers propose modifying certain types of chemical structures called transition nano carbons which contain many atoms arranged randomly within each particle's crystal lattice network instead of being uniformly filled throughout. By doing away with complex compositions containing multiple atomic layers of different elements, the risk of cracking becomes less likely than beforehand. Additionally, there exist techniques for producing various forms of precursors including graphenes, hydrindoxanes, and ammonia gas, allowing for precise control over composition and size distribution.

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