Preparation method and application of negative electrode material MXene for lithium battery

Abstract

The invention relates to a preparation method of a negative electrode material MXene for a lithium battery and belongs to the field of preparation of negative electrode materials for lithium batteries. The method comprises the following steps of (1) taking MAX powder as a positive electrode and IA or IIA group metals as a negative electrode, putting the positive electrode and the negative electrode into an electrolyte to form a battery system and carrying out charging and discharging; and (2) after charging and discharging are completed, putting the obtained product into an acid solution for soaking and drying to obtain the negative electrode material MXene for the lithium battery. Compared with the prior art, the preparation method has the advantages that the battery system is formed by taking an MAX-phase material as the positive electrode and the IA or IIA group metals as the negative electrode, charging and discharging are carried out, and atoms, such as Cr, Al and Si in the MAX-phase material are removed to obtain the MXene material with a porous silicon structure; and the raw material, namely hydrofluoric acid, which is dangerous and harmful to the environment and human bodyis not adopted to prepare the MXene material, so that the preparation method disclosed by the invention is safer and more environment-friendly than a traditional method.

Description

technical field [0001] The invention belongs to the field of preparation of battery negative electrode materials, and in particular relates to a preparation method and application of lithium battery negative electrode material MXene. Background technique [0002] MXene is a new type of transition metal carbide (nitride) two-dimensional crystal, which has a structure similar to graphene, and its chemical formula is M n+1 x n , wherein n=1, 2 or 3, M is an early transition metal element, and X is carbon or nitrogen. MXene has good hydrophilicity, light transmission, conductivity, and magnetism, and can be used in many fields such as batteries, supercapacitors, hydrogen storage, and sensors. [0003] At present, the negative electrode materials of lithium-ion batteries are mainly graphite electrode materials, and its theoretical specific energy is only 372mAh / g, which limits the improvement of the overall performance of lithium batteries. It is urgent to develop a new type of...

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Problems solved by technology

[0005] Patent application CN106025236A discloses a kind of S-SnO 2 / Ti 3 C 2 A method for preparing a two-dimensional nanoparticle ion battery negative electrode material, the method uses Ti 3 AlC 2 , SnCl 4 ·5H 2 O and thioacetamide were used as raw materials, and S-SnO was prepared by etching with hydrofluoric acid, mixing ultrasound, rapid stirring, washing and drying. 2 / Ti 3 C 2 Nanocomposite materials can effectively improve the capacitance, but the preparation process is more complicated and the cost is higher

[0006] It can be seen that in the above-mentioned prior art, MXene materials are mainly prepared by etching the MAX phase with hydrofluoric acid, but hydrofluoric acid is extremely dangerous, and is harmful to the environment and human body, and the electrical properties of MXene materials prepared by this method The chemical properties are low, and there is still room for further development. Therefore, it is necessary to study a new preparation method for lithium battery anode materials MXene

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