Three-dimensional graphene reticular structure loaded carbon-coated tin nanometer material as well as preparation method and application thereof

Abstract

The invention discloses a three-dimensional graphene reticular structure loaded carbon-coated tin nanometer material as well as a preparation method and an application thereof. The three-dimensional graphene reticular structure loaded carbon-coated tin nanometer material is formed by uniformly loading carbon-coated tin nanometer particles on a three-dimensional graphene network. The preparation method comprises the following preparation processes: fully dissolving and mixing NaCl serving as a dispersing agent and a template with a metallic tin source and a carbon source, carrying out freeze drying, and porphyrizing, thus obtaining a mixture; putting the mixture in a tubular furnace, and calcining under the effect of hydrogen catalysis, thus obtaining a calcined product; and washing the calcined product, thus obtaining the three-dimensional graphene reticular structure loaded carbon-coated tin nanometer material. The preparation method has the advantages that the preparation process is safe and harmless, the operation is simple, the yield is high, and when being used as an anode material for a lithium ion battery, the prepared three-dimensional graphene reticular structure loaded carbon-coated tin nanometer material has relatively high reversible capacity and cyclic stability.

Description

Technical field [0001] The invention involves a three -dimensional graphene mesh structure load carbon covering tin nano -material, preparation and application, which belongs to the field of lithium ion secondary battery electrode materials. Background technique [0002] Lithium -ion batteries, as a secondary battery, have the advantages of high energy density, wide working range, high discharge voltage, no environmental pollution, no memory effect, etc. Compared with nickel -cadmium and nickel -metal hydride batteries, their circulation life is long and good safety performance is good.EssenceTherefore, at present, lithium -ion batteries have been widely used in portable devices such as mobile phones, cameras, cameras, laptops, etc., as one of the important energy sources in the new generation of hybrid vehicles (HEV) and pure electric vehicles (EV).It will be applied in the military fields such as satellites and aerospace. [0003] At present, the carbon negative material is wid...

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Problems solved by technology

[0003]At present, the widely used carbon negative electrode material in lithium-ion batteries is graphite, and its theoretical capacity is 372 mA h / g. The capacity is low, and it is difficult to meet high power and energy density. The demand of electric vehicles, so, the development of new lithium-ion batteries with high discharge voltage, high capacity and longer life is the most important task

Tin-based anode materials have good electrical conductivity due to their high theoretical specific capacity (992mAh / g) (J. Am. Chem. Soc, 2003, 125, 5652-5653) , safety, environmental protection, low price and other advantages have attracted hot attention, but its fatal weakness is that the tin-based material will cause a violent expansion of its own volume (about 340%) due to the intercalation and extraction of lithium ions during the charging and discharging process, thus It is easy to cause pulverization of active materials during circulation, which leads to poor cycle performance and rate performance

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