加入增韧材料提高TiO<sub>2</sub>复合纳米电极的力学和电化学性能

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Abstract In order to improve the problem of poor mechanical properties of traditional titanium composite film electrodes, a porous titanium continuous composite toughened film with excellent mechanical properties and high specific capacity was prepared as a negative electrode material for lithium batteries. In this paper, a porous titanium composite toughened flat film with excellent mechanical properties and high space utilization was prepared by a combination of non-solvent phase separation method and high-temperature sintering, and then the optimal anodizing condition was selected for surface modification to grow TiO₂ nanometer. The tube was finally annealed to obtain a continuous composite toughened porous tita-nium film electrode.In this experiment, a titanium mesh with a diameter of 3 μm and a titanium wire with a diameter of 100 μm and a thickness of 100 μm were used as raw materials,and N-methyl-2-pyrrolidone, polyvinylpyrrolidone, and polyacrylonitrile were used as additives to prepare po-rous titanium composite toughened flat film.The film was sintered at 1 000 ℃ under the protection of argon gas to obtain a porous titanium compo-site toughened flat film with a pore diameter of about 2—8 μm. The anodic oxidation method was used to directly grow TiO₂ nanotubes on the po-rous titanium composite toughened flat film and the titanium mesh to prepare the porous titanium continuous composite tougheneid film electrode. The composite film electrode has good electrochemical performance as an anode electrode material for lithium batteries. Its specific capacity can be stabilized at about 1 250 μAh/cm² at a current density of 100 μA/cm². Even if the current density is increased to 500 μA/cm², the specific capacity can still be maintained at 950 μAh/cm². Compared with a single TiO₂ thin film electrode, the toughened titanium composite toughened film electrode has significantly improved mechanical properties,which further improves the structural stability during the reaction. At the same time, the capacity of the new three-dimensional porous framework structure is 20%~30% higher than that of the porous titanium film electrode without the toughening material titanium mesh. This work uses the same material as the toughening material to prepare composite thin-film electrodes, which not only improves the problem of poor mechanical properties of TiO₂ thin-film electrodes, but also further improves its specific capacity and cycle stability. It provides a new idea for TiO₂ composite material to be used as a negative electrode material for lithium batteries.

Key words： toughening treatment titanium mesh titanium dioxide nanotube TiO₂ nanotubes mechanical behavior titanium composite film electrode

Published: 08 January 2021

CLC number:

TQ131.1

Fund:This work was financially supported by Tianjin Municipal Education Committee Scientific Research Project (2017KJ075).

About author:: Pengfei Zhang graduated from Jinzhong College in June 2018 with a bachelor's degree in engineering. Now he is a postgraduate of the School of Mechanical Engineering of Tianjin Polytechnic University, conducting research under the guidance of Professor Zhijun Qiao. The main research direction is new energy materials and lithium ion battery.Zhijun Qiao, Ph. D., associate professor. The main direction is new energy materials and electrochemistry.

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	ZHANG Pengfei
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	ZHAO Tan
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Cite this article:

ZHANG Pengfei,QIAO Zhijun,ZHANG Zhijia, et al. Adding Toughening Materials to Improve the Mechanical and Electrochemical Properties of TiO₂ Composite Nanoelectrodes[J]. Materials Reports, 2020, 34(Z2): 24-29.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2020/V34/IZ2/24

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