A silicon carbide mesoporous composite membrane and preparation and application thereof

Abstract

The invention relates to a silicon carbide mesoporous composite membrane and preparation and application thereof, the silicon carbide mesoporous composite film comprises a silicon carbide mesoporous material, Mn3O4 nanoparticles and carbon nanotubes, the Mn3O4 nanoparticles are embedded in the silicon carbide mesoporous material, the mesoporous material in which the Mn3O4 nanoparticles are embedded is granular or lamellar, the carbon nanotubes and the silicon carbide mesoporous material in which the Mn3O4 nanoparticles are embedded are wound and bonded to form an integral lamellar film structure, or the carbon nanotubes are separately wound and bonded into a lamellar structure which form an internal multilayer structure with the silicon carbide mesoporous material, the silicon carbide mesoporous composite film and the Mn3O4 nanoparticles are used as a negative electrode material of a lithium ion battery, compared with a carbon material, the reversible capacity is high, pulverization resistance and cyclicity are good, and dendritic sgegregation formation is reduced, the carbon nanotubes have viscosity, which helps to maintain the film structure of the negative electrode, and the tubular and porous structures of the carbon nanotubes are conducive to lithium ion transport, thereby realizing the function of fast charging.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, and more specifically, to a silicon carbide mesoporous composite membrane and its preparation and application. Background technique [0002] Lithium-ion battery is a kind of secondary battery, it mainly relies on lithium ions to move between positive and negative electrodes to work, when charging, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state, and the opposite is true during discharge. [0003] Materials such as graphite, carbon, graphene, and carbon nanotubes have excellent conductivity and stability, and are commonly used as negative electrode materials for lithium-ion batteries, but they have the disadvantages of high irreversible capacity, voltage hysteresis, and indistinct discharge platform. Element, silicon has an ultra-high theoretical lithium...

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Problems solved by technology

[0006] Transition metal oxides have a higher mass specific capacity, which is about twice that of carbon materials. Due to the above advantages, transition metal oxides also participate in the improvement of lithium ion battery negative electrode materials. The prior art CN104600261A provides a Graphite / Mn with high capacity and good cycle stability 3 o 4 Composite materials, but still have the disadvantage of high irreversible capacity

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