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Lithium metal anode material based on tio2 nanotube array/titanium foam and preparation method thereof

A technology of nanotube array and lithium metal negative electrode, which is applied to battery electrodes, electrical components, circuits, etc., to achieve the effects of simple process, uniform electric field distribution, and safe operation

Active Publication Date: 2019-01-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods cannot fundamentally solve the volume change and Li dendrite growth of Li metal during deposition and precipitation.

Method used

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  • Lithium metal anode material based on tio2 nanotube array/titanium foam and preparation method thereof
  • Lithium metal anode material based on tio2 nanotube array/titanium foam and preparation method thereof
  • Lithium metal anode material based on tio2 nanotube array/titanium foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of TiO on the Surface of Porous Titanium Foam by Electrochemical Anodic Oxidation 2 Nanotube arrays, and crystallization annealing, and then using the melt infusion method, metal lithium and TiO 2 The nanotube array / titanium foam composite obtains a high metal lithium loading capacity, which can greatly limit the volume expansion of metal lithium and inhibit the production of metal lithium dendrites and "dead lithium" during the cycle charge and discharge process. Concrete preparation method steps are as follows:

[0026] 1. The titanium foam with a thickness of 0.5 mm and a pore size of 50 μm was cut to the required size.

[0027] 2. Ultrasonic cleaning of the cut foam titanium sheet in acetone, absolute ethanol and deionized water for 20 min respectively, and drying for use; prepare NH 4 F concentration is 0.25mol L -1 、H 2 8 % NH by volume of O 4 F—Water-ethylene glycol solution was used as the electrolyte, the cleaned foamed titanium sheet was use...

Embodiment 2

[0035] The preparation method of this embodiment is the same as that of embodiment 1, and the difference is that step 3 is skipped, that is, in step 4, the amorphous TiO 2 Nanotube array / titanium foam matrix immersed in molten lithium, allowing liquid molten lithium to absorb TiO 2 Nanotube array / titanium foam three-dimensional framework, other conditions remain unchanged, prepared based on TiO 2 Li metal anode material of nanotube array / titanium foam (amorphous TiO 2 ). Based on the TiO obtained in Example 1 2 Compared with the lithium metal anode material of nanotube array / titanium foam, the TiO-based 2 Li metal anode material of nanotube array / titanium foam (amorphous TiO 2 ) metal lithium loading decreased to 53.2wt.%, the hysteresis voltage of the assembled symmetric battery increased, and the cycle charge and discharge to 269 cycles (538 hours) failed.

Embodiment 3

[0037] The preparation method of this example is the same as that of Example 1, except that the titanium foam used in step 1 has a thickness of 0.5 mm, a pore size of 20 μm, and other conditional parameters remain unchanged. Based on the TiO obtained in Example 1 2 Compared with the lithium metal anode material of nanotube array / titanium foam, the TiO-based 2 The metal lithium loading of the lithium metal anode material of the nanotube array / titanium foam decreased to 47.3wt.%, and the hysteresis voltage of the assembled symmetrical battery increased slightly, and the cycle charge and discharge failed to 278 cycles (556 hours).

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Abstract

The invention belongs to the technical field of new energy materials and energy storage and conversion materials, in particular to a lithium metal anode electrode material based on TiO2 nanotube array / titanium foam and a preparation method thereof. TiO2 nanotube arrays were prepared on the surface of porous titanium foam by anodic oxidation and annealed, A lithium metal anode material with high loading of lithium metal, which can greatly alleviate the volume expansion effect of lithium metal and restrain the lithium dendrite in the process of cycling charge and discharge, was prepared by melt-perfusion method by compositing lithium metal with TiO2 nanotube array / titanium foam. A surface of that porous titanium foam three-dimensional conductive skeleton in the negative electrode material isuniformly covered with a lay of ordered TiO2 nanotube array, and lithium metal is uniformly filled with the TiO2 nanotube array / titanium foam matrix. A symmetrical cell was fabricate by using that lithium metal anode material. The cell was fabricated at 0.5 mA- cm<2> Cycling 300 cycles (600 hours) at current density, exhibiting lithium-free dendrite and stable cycling.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and energy storage and conversion materials, and in particular relates to a TiO-based 2 Lithium metal anode material of nanotube array / titanium foam and preparation method thereof. Background technique [0002] With the continuous improvement of people's requirements for the energy density of lithium-ion batteries, the existing graphite / transition metal oxide system has been difficult to meet the requirements of ultra-high specific energy, metal lithium due to its high theoretical specific capacity (3860 mAh / g) and low electrochemical potential (−3.04 V, compared to a standard hydrogen electrode) are considered to be the most promising anode materials. However, the uneven deposition of lithium metal during the battery cycle will produce "dendrites", and the growing lithium dendrites will pierce the battery separator and cause internal short circuits in the battery, causing fire or ev...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/62
CPCH01M4/364H01M4/38H01M4/485H01M4/62H01M4/624Y02E60/10
Inventor 刘家琴陈翔刘铭许俊李沫张琪吴玉程
Owner HEFEI UNIV OF TECH
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