Flexible negative electrode with MnO2 attached onto carbon fiber of lithium ion battery and preparation method of flexible negative electrode

Abstract

The invention relates to a flexible negative electrode with MnO2 attached onto carbon fibers of a lithium ion battery and a preparation method of the flexible negative electrode. A metal oxide in the prior art is wrapped inside the carbon nanofibers, and thus, the contact of the metal oxide serving as an active substance with an electrode and the de-intercalation process of the metal oxide with lithium ions are not promoted; and further, the metal oxide is Fe2O3, Fe3O4, Co3O4 and the like, and such metal oxide has a defect of relatively high de-intercalation lithium potential. The preparation method is characterized by comprising the following steps of firstly, preparing a flexible carbon nanofiber net, which comprises electrostatic spinning, pre-oxidation of a polymer nanofiber net and high-temperature calcination; secondly, preparing a flexible composite fiber thin film with an MnO2 nanowire attached onto the surfaces of the carbon nanofibers, placing the flexible carbon nanofiber net in a KMnO4 solution, and completing high-temperature reaction under process conditions of a reaction temperature of 150-200 DEG C and reaction time of 30-60 minutes; and finally, cutting the flexible carbon nanofiber net into the flexible negative electrode with MnO2 attached onto the carbon fibers of the lithium ion battery.

Description

technical field [0001] The invention relates to a carbon fiber attached MnO 2 The invention discloses a lithium-ion battery flexible negative electrode and a preparation method thereof, belonging to the technical field of lithium-ion battery electrodes. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high energy density, high output voltage, good cycle stability, and environmental friendliness, and have become the dominant chemical power source for portable electronic products. With the development of flexible and wearable mobile electronic devices, lithium-ion batteries are required to be bendable or foldable and thinner. Lithium-ion batteries with this feature are called flexible lithium-ion batteries, and the main components of flexible lithium-ion batteries The technical requirement is to have flexible electrodes, including flexible negative electrodes. [0003] The flexible electrode has a self-supporting structure that can be t...

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Problems solved by technology

[0005] However, in the prior art, the metal oxide is wrapped inside the carbon nanofiber, which will not be conducive to the contact of the metal oxide as an active material with the electrolyte and the deintercalation process of lithium ions; Yes, the metal oxide is Fe 2 o 3 , Fe 3 o 4 、Co 3 o 4 etc. This type of metal oxide has the disadvantage of high potential for lithium intercalation and deintercalation

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