Li-Ti3C2-rGO composite thin film material and preparation method thereof

Abstract

The invention provides a Li-Ti3C2-rGO composite thin film material and a preparation scheme thereof. The Li-Ti3C2-rGO composite thin film material is prepared by the following steps that step 1, a GOdispersion solution and a Ti3C2 dispersion solution are prepared, the concentration of the GO dispersion solution and the Ti3C2 dispersion solution is 1-4mg / mL, after the GO dispersion solution and the Ti3C2 dispersion solution are mixed, stirring is carried out, and then ultrasonic treatment is carried out; step 2, the solution obtained in the step 1 is subjected to vacuum filtration in batches;step 3, a Ti3C2-GO thin film filtered by the step 2 is subjected to air drying naturally, a contact heat table is torn off from the filter film, so that the Ti3C2-GO thin film becomes a multihole Ti3C2-rGO thin film; and step 4, the multihole Ti3C2-rGO thin film in the step 3 is in contact with a molten lithium metal. According to the thin film prepared by the preparation scheme, the electrode hasgood flexibility, and is very useful for wearable electrode design; and the uniform and rapid combination of the lithium metal with the composite material can be realized, the lithium content of thethin film material is high, and the superstrong protection for the lithium metal can be realized.

Description

technical field [0001] The invention relates to a composite film material and a preparation method thereof, in particular to a Li-Ti 3 C 2 - rGO composite thin film material and preparation method thereof. Background technique [0002] Lithium-ion battery is a rechargeable high-energy-density energy storage device. In its negative electrode material, metal lithium is due to its high theoretical specific capacity (3860mAh / g) and low redox potential (-3.04, vs. SHE), and low density (0.53g / cm 3 ) has become the ultimate goal of lithium battery development. Lithium-sulfur batteries or lithium-oxygen batteries composed of metallic lithium and sulfur cathodes or oxygen cathodes have the highest specific capacity among all electrochemical energy storage devices. Therefore, lithium metal anode materials are the ultimate choice for new energy vehicles. Existing metal lithium anode applications and Li-Ti 3 C 2 The synthesis process of -rGO thin film material has the following ...

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Problems solved by technology

[0003] Problem 1: It is difficult to realize the safe application of metallic lithium anodes with existing technologies: pure metallic lithium sheets prepared with existing technologies cannot be applied to industrially produced batteries

[0004] Problem 2: It is difficult to realize the preparation of porous films in the existing technology: the film materials prepared in the prior art are often used in vacuum filtration and rolling, etc., and the prepared film materials are mostly tightly packed, without porous structure, and there is no large amount of storage The space of metal lithium cannot exert the characteristics of high specific capacity of metal lithium

[0005] Problem 3: It is difficult to realize the preparation and large-scale industrial production of porous rGO films in the prior art: rGO has high lithium affinity and can be used as a host material to protect lithium, but the rGO films prepared in the prior art are extracted by GO After being filtered into a film, it is formed after heat treatment and reduction, but a slight explosive reaction will occur during the heat treatment process. Although a porous structure can be obtained, rGO cannot preserve the complete film shape and mechanical properties due to the impact of the explosion. Poor, unable to achieve controllable production

[0006] Problem 4: It is difficult to achieve rapid and uniform recombination of the protective framework and metallic lithium in the existing technology: in the prior art, the electrodeposition method is often used to deposit metallic lithium into the protective framework, which takes a long time and needs to be disassembled after it is made For the original battery, take out the composite material and then assemble the target battery. The process is relatively cumbersome, and it is difficult to compound lithium metal and protective materials on a large scale, quickly and uniformly, and the industrial production cost is relatively high.

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