Titanium oxide@C hollow composite framework, preparation method and application thereof

A titanium oxide and hollow technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, electrochemical generator, etc., can solve the problems of uncontrollable dendrites, large volume effect, low Coulombic efficiency, etc., and achieve strong lithium affinity, Suppresses shuttle and improves the effect of volume effect

Pending Publication Date: 2021-10-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of large volume effect, uncontrollable dendrites and low Coulombic efficiency in the existing lithium metal negative electrode under the actual charging and discharging system, the present invention provides a titanium oxide@C hollow composite framework material (also called titanium oxide @C Composite hollow spheres, or composite hollow carbon spheres for short), aim to improve the deposition inhomogeneity of lithium under high current and reduce the Volume effect to improve the cycle performance of lithium metal anode

Method used

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  • Titanium oxide@C hollow composite framework, preparation method and application thereof
  • Titanium oxide@C hollow composite framework, preparation method and application thereof
  • Titanium oxide@C hollow composite framework, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0064] Put 0.1g of PS balls with an average diameter of 400nm in 35ml of ethanol solvent, add 0.35g of hexadecylamine and 0.9ml of ammonia water, stir for 10min, then add 0.3ml of tetraisopropyl titanate, react for 2h, filter and wash to obtain PS @TiO 2 . Add 150ml of 0.01mol / L trismethylol-aminomethane and ultrasonically disperse, continue to add 0.08g of dopamine, adjust the pH to 8.5, stir for 12h, filter and wash, and dry at 70°C for 8h. Transfer to a tube furnace under a mixed flow of hydrogen and argon at 5°C / min and heat up to 900°C for 4 hours to obtain nitrogen-doped TiO 2 @C Hollow composite skeleton material.

[0065] From the experimental results, it can be seen that TiO 2 @C The surface of the hollow composite skeleton is evenly distributed with N elements, and the proportion of N elements is 10at.%. TiO is on the composite skeleton 2 The wall thickness of the hollow shell is 20nm, the cavity volume accounts for 70%, the shell is uniform and complete, the thi...

Embodiment 2

[0079] Put 0.1g of PS balls with an average diameter of 400nm in 35ml of ethanol solvent, add 0.35g of hexadecylamine and 0.9ml of ammonia water, stir for 10min, then add 0.35ml of tetraisopropyl titanate, react for 2h, filter and wash to obtain PS @TiO 2 . Add 150ml of 0.01mol / L trismethylol-aminomethane and ultrasonically disperse, continue to add 0.08g of dopamine, adjust the pH to 8.5, stir for 12h, filter and wash, and dry at 70°C for 8h. Transfer to a tube furnace under a mixed flow of hydrogen and argon at 5°C / min and heat up to 900°C for 4 hours to obtain nitrogen-doped TiO 2 @C Hollow composite skeleton material. From the experimental results, it can be seen that TiO 2 @C The surface of the hollow composite skeleton is evenly distributed with N elements, and the proportion of N elements is 10.2 at.%. TiO is on the composite skeleton 2 The wall thickness of the hollow shell is 25nm, the cavity volume accounts for 68%, the shell is uniform and complete, the thicknes...

Embodiment 3

[0087] Put 0.1g of PS balls with an average diameter of 400nm in 35ml of ethanol solvent, add 0.35g of hexadecylamine and 0.9ml of ammonia water, stir for 10min, then add 0.3ml of tetraisopropyl titanate, react for 2h, filter and wash to obtain PS @TiO 2 . Add 150ml of 0.01mol / L trismethylol-aminomethane and ultrasonically disperse, continue to add 0.09g of dopamine, adjust the pH to 8.5, stir for 12h, filter and wash, and dry at 70°C for 8h. Transfer to a tube furnace under a mixed flow of hydrogen and argon at 5°C / min and heat up to 900°C for 4 hours to obtain nitrogen-doped TiO 2 @C Hollow composite skeleton material. From the experimental results, it can be seen that TiO 2 @C The surface of the hollow composite skeleton is evenly distributed with N elements, and the proportion of N elements is 10.5 at.%, and TiO is on the composite skeleton 2 The wall thickness of the hollow shell is 20nm, the cavity volume accounts for 70%, the shell is uniform and complete, the thick...

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Abstract

The invention belongs to the field of lithium metal battery negative electrode materials, and particularly discloses a titanium oxide@C hollow composite framework, a preparation method and application thereof. The titanium oxide@C hollow composite framework comprises titanium oxide hollow spheres with independent closed cavities, a carbon layer compounded on the surface of titanium oxide and a nitrogen-containing functional group. The preparation method comprises the following steps: preparing a hollow titanium oxide precursor by using a template method, then carrying out in-situ polymerization to obtain a carbon-coated hollow composite framework precursor, and finally roasting at a certain temperature to obtain the titanium oxide@C hollow composite framework. According to the invention, due to the closed cavity structure, good conductivity and excellent lithium affinity of the composite hollow current collector, the nucleation overpotential and the local current density of lithium deposition are effectively reduced, the side reaction and the volume effect of an interface are greatly avoided, the growth of lithium dendrites is effectively inhibited, favorable conditions are created for uniform lithium deposition/dissolution, and the coulombic efficiency and the cycling stability of the lithium metal battery are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of lithium metal battery electrode materials, and in particular relates to a current collector of a lithium metal battery and a preparation method and application thereof. Background technique [0002] Lithium metal has a very high theoretical specific capacity of 3860mAhg -1 , the lowest electrochemical potential -3.04V (relative to the standard hydrogen electrode), has been considered as the most potential anode material for the next generation of high-energy secondary battery system. However, the extremely high activity of the lithium metal anode results in serious side reactions at the interface in contact with the electrolyte, and the interface reaction consumes a large amount of active lithium, resulting in an irreversible lithium capacity and a rapid decline in Coulombic efficiency; During the process, a huge volume change is caused, resulting in the instability of the interface and a large amount of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053C01B32/15H01M4/134H01M4/66H01M10/052H01M10/42B82Y30/00B82Y40/00
CPCC01G23/053C01B32/15H01M4/667H01M4/663H01M4/134H01M10/052H01M10/4235B82Y30/00B82Y40/00C01P2006/40Y02E60/10
Inventor 洪波赖延清姜怀易茂义张治安张凯方静
Owner CENT SOUTH UNIV
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