Preparation method of three-dimensional rod-like potassium titanate material

Abstract

The invention discloses a preparation method of a three-dimensional rod-like potassium titanate material, which comprises the following steps of (1) dissolving potassium hydroxide in water to preparea potassium hydroxide solution with the concentration of 1-5 mol / L, (2) adding Ti3C2Tx into the potassium hydroxide solution prepared in the step (1), uniformly mixing, and fully reacting to obtain aprecursor dispersion liquid, (3) centrifuging, washing and drying the dispersion liquid obtained in the step (2) to obtain a precursor, and (4) carrying out heat preservation on the precursor obtainedin the step (3) in an air atmosphere at 800-1100 DEG C for 1-5 hours, cooling, and collecting solids to obtain the three-dimensional rod-like potassium titanate material. Compared with potassium titanate prepared by a hydro-thermal treatment method, the rod-like potassium titanate prepared by taking Ti3C2Tx as a raw material has a three-dimensional structure and is beneficial to full contact withan electrolyte, so that the diffusion resistance is reduced. In addition, the intrinsic carbon layer of Ti3C2Tx can remarkably improve the conductivity of potassium titanate, so that the rate capability is improved.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a preparation method of a three-dimensional rod-shaped potassium titanate material. Background technique [0002] As a mature energy storage device, lithium-ion batteries have been widely used in various electronic products and new energy vehicles due to their advantages such as high energy density, wide operating temperature, and long cycle life. However, due to the small reserves and uneven distribution of lithium mineral resources in the earth's crust, as the usage of lithium-ion batteries continues to increase, the prices of upstream materials (lithium carbonate, cobalt hydroxide, etc.) for lithium-ion batteries are also rising, making lithium The high cost of ion batteries makes it difficult to further apply them on a large scale. The energy storage market urgently needs new energy storage devices with lower cost. [0003] Lithium (Li), sodium (Na) and potas...

AI Technical Summary

Problems solved by technology

Existing potassium titanate (K 2 Ti 4 o 9 ) are mostly synthesized by hydrothermal treatment, however, hydrothermal treatment requires the addition of a strong oxidant H 2 o 2 , so the obtained potassium titanate has poor uniformity, is prone to agglomeration, and has poor electrical conductivity, which is not conducive to the full performance of potassium ion batteries.

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