Self-supporting flexible film consisting of bead-like lithium titanate nano-particles and preparation method thereof

Abstract

The invention provides a self-supporting flexible film consisting of bead-like lithium titanate nano-particles and a preparation method thereof. The method comprises the following steps: 1) preparing a titanium oxide nanotube array, taking titanium foils, sanding and polishing the surfaces of the titanium foils with carborundum paper to obtain the titanium oxide nanotube array with an anodizing method, and then putting the titanium oxide nanotube array in a tubular furnace for heat treatment under an air condition; 2) putting the titanium oxide nanotube array sample obtained through anodizing and heat treatment into a hydrothermal kettle of 80 ml, adding a 0.5-1 mol / L of LiOH solution for configuration, and putting the hydrothermal kettle into a baking oven of 80 to 120 DEG C for 10 to 15 h; and 3) drying the sample after hydrothermal treatment and putting in the tubular furnace for heat treatment, preserving the temperature of 700 DEG C for 3 h under the air condition, and naturally cooling to room temperature along with the furnace so as to obtain the self-supporting flexible film. The preparation technology is reliable, low in energy consumption and high in yield, a prepared lithium titanate array is obvious in structure, high in particle tap density, uniform in distribution and controllable in structural parameters, and the self-supporting flexible film is applicable for the field of power battery electrode materials.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a self-supporting flexible film composed of beaded lithium titanate nanoparticles and a preparation method thereof. Background technique [0002] In recent years, due to the huge application prospects of nanomaterials, they have attracted extensive attention from researchers. Theoretical and experimental research results show that, compared with ordinary powder materials, nanomaterials show more excellent performance. Lithium titanate (Li 4 Ti 5 o 12 ) As an electrode material, its crystal lattice constant and volume change are very small (less than 1%) when inserting or extracting lithium ions, so it is called "zero strain material". In the charge-discharge cycle, this "zero strain" can avoid the structural damage caused by the back and forth expansion and contraction of the electrode material, thereby improving the cycle performance and service life ...

AI Technical Summary

Problems solved by technology

Conductive agents and binders themselves cannot provide effective capacity, which reduces the overall capacity of the electrode material. At the same time, these additives will occupy a large volume, and the volume occupied by the active material is low, which will reduce the volume capacity of the electrode material, and then reduce the volume energy density.

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