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.
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2020, Vol. 34 
