Preparation method of granular tin dioxide/two-dimensional nano-titanium carbide composite material

Abstract

The invention provides a preparation method of a tin dioxide / two-dimensional nano titanium carbide composite material. The preparation method comprises: carrying out ball milling on ternary layered Ti3AlC2 ceramic powder; immersing the obtained product in hydrofluoric acid solution to perform the reaction for 6h to 120h; stirring, centrifugally cleaning a corrosion product by using deionized water, and drying an obtained solid sample to obtain a two-dimensional layered nano material MXene-Ti3C2; and mixing SnCl4.5H2O, glucose and the two-dimensional nano MXene-Ti3C2, using ethanol as a solvent, adjusting PH to 12 to 14, stirring with a magnetic force for 2h, performing the reaction at 120 DEG C for 6h, and after naturally cooling to a room temperature, carrying out centrifuging and drying to obtain a SnO2 / MXene-Ti3C2 composite material. The material obtained by the preparation method can effectively alleviate a volume effect of SnO2 nano particles, and the SnO2 / MXene-Ti3C2 nano composite material has an excellent application prospect in the field of an anode material field of a high storage germanium lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of nano functional material preparation and application thereof, and in particular relates to a preparation method of granular tin dioxide / two-dimensional nano titanium carbide composite material. Background technique [0002] Two-dimensional layered nanocarbide MXene-Ti 3 C 2 It is a material with a graphene-like structure. Ultrathin two-dimensional nanosheets have super catalytic properties due to their unique morphology, small particle size, large surface-to-volume ratio, and atomic-level layer thickness. Photovoltaic performance and electrochemical performance have been widely used in functional ceramics, photocatalysis, lithium-ion batteries, solar cells, gas sensors, etc., but the two-dimensional layered nanocarbide MXene-Ti 3 C 2 It is not easy to synthesize directly, but by Ti 3 AlC 2 It is a simple and easy method to prepare ceramic powder as a precursor. [0003] Ternary layered Ti 3 AlC 2 ...

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Problems solved by technology

[0004] Tin oxide has attracted much attention because of its high specific capacity and low lithium intercalation potential. It was once considered to be the most promising substitute for carbon anode materials, but it also has some disadvantages, such as volume expansion of up to 50% during the first charge and discharge process. % or more, the phenomenon of "powdering" and "agglomeration" is prone to occur during the repeated intercalation and extraction of lithium ions during the cycle, which lead to a rapid decline in the electrochemical performance of tin oxide, thus limiting its wide application in lithium-ion batteries. application

[0005] Marwick and others prepared graphene-based tin dioxide nanocomposites and studied their electrochemical properties. The experimental results showed that the charge-discharge capacity of graphene-based tin dioxide as a negative electrode material for lithium-ion batteries was significantly improved (Marwick. SnO 2 / Study on the electrochemical performance of graphene composite materials [D]. Yanshan: Yanshan University, 2011.); Zhu et al prepared SnO by hydrothermal method 2 / graphite nanocomposite materials and showed that its performance in lithium-ion batteries, photocatalysis, etc. is superior to single graphene materials (Yun Guang Zhu, Ye Wang, Jian Xie, Gao-Shao Cao, Tie-Jun Zhu, Xinbing Zhao, Hui Ying Yang, Effects of Graphene Oxide Function Groups on SnO 2 / GrapheneNanocomposites for Lithium Storage Application, [J].Electrochimica Acta.154(2015)338–344.). However, the above studies all use SnO 2 Supported on graphene, graphene cannot effectively relieve SnO 2 The volume effect, and in Li + Easily damaged during de-embedding

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