Titanium oxide nanotube-based lithium sulfide electrode and preparation method thereof

A technology of titanium oxide nanotubes and lithium sulfide, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor electronic conductivity of lithium sulfide and elemental sulfur, low battery coulombic efficiency, poor cycle life, etc., and achieve inhibition of shuttling effect, promote transport, enhance electronic conductivity

Pending Publication Date: 2022-04-08
HANGZHOU DIANZI UNIV
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  • Description
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Problems solved by technology

[0003] However, in order to realize the practical application of lithium sulfide electrodes, there are still some problems, mainly including: (1) the poor electronic conductivity of lithium sulfide and elemental sulfur, resulting in poor rate performance; (2) lithium polysulfide (Li 2 S x , 4≤x≤8) dissolution and diffusion cause "shuttle effect", resulting in low coulombic efficiency and poor cycle life of the battery

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  • Titanium oxide nanotube-based lithium sulfide electrode and preparation method thereof

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Embodiment 1

[0028] A preparation method of a lithium sulfide electrode based on titanium oxide nanotubes, the specific steps are as follows:

[0029] S1, TiO nanotubes with open ends were prepared by anodic oxidation method. The titanium sheet is used as an anode, the graphite is used as a cathode, and the electrolyte is an ethylene glycol solution containing 0.1% ammonium fluoride and 0.3% water. First anodize at 50V for 8h, then switch the voltage to 100V for 1min. Washing the anodized titanium sheet in an alcohol solution makes the two-way titanium oxide nanotube array fall off from the titanium sheet substrate.

[0030] S2, the titanium oxide nanotube array was heated to 700°C at 2°C / min in the air and kept for 2h, then cooled down naturally.

[0031] S3, irradiating the titanium oxide nanotube array treated in step S2 with an ultraviolet lamp for 30 min.

[0032] S4, configure an aqueous solution of lithium sulfate and glucose, wherein the mass ratio of lithium sulfate, glucose, a...

Embodiment 2

[0035] A preparation method of a lithium sulfide electrode based on titanium oxide nanotubes, the specific steps are as follows:

[0036] S1, TiO nanotubes with open ends were prepared by anodic oxidation method. The titanium sheet is used as an anode, the graphite is used as a cathode, and the electrolyte is an ethylene glycol solution containing 0.1% ammonium fluoride and 0.3% water. First anodize at 50V for 8h, then switch the voltage to 100V for 1min. Washing the anodized titanium sheet in an alcohol solution makes the two-way titanium oxide nanotube array fall off from the titanium sheet substrate.

[0037] S2, the titania nanotube array was heated to 450°C at 2°C / min in air and kept for 2h, then cooled down naturally.

[0038] S3, irradiating the titanium oxide nanotube array treated in step S2 with an ultraviolet lamp for 10 min.

[0039] S4, configure an aqueous solution of lithium sulfate and glucose, wherein the mass ratio of lithium sulfate, glucose, and water is...

Embodiment 3

[0042] A preparation method of a lithium sulfide electrode based on titanium oxide nanotubes, the specific steps are as follows:

[0043] S1, TiO nanotubes with open ends were prepared by anodic oxidation method. The titanium sheet is used as an anode, the graphite is used as a cathode, and the electrolyte is an ethylene glycol solution containing 0.1% ammonium fluoride and 0.3% water. First anodize at 50V for 8h, then switch the voltage to 100V for 1min. Washing the anodized titanium sheet in an alcohol solution makes the two-way titanium oxide nanotube array fall off from the titanium sheet substrate.

[0044] S2, the titania nanotube array was heated to 500°C in air at 2°C / min and kept for 2h, then cooled down naturally.

[0045] S3, irradiating the titanium oxide nanotube array treated in step S2 with an ultraviolet lamp for 20 minutes.

[0046] S4, configure an aqueous solution of lithium sulfate and glucose, wherein the mass ratio of lithium sulfate, glucose, and wate...

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Abstract

The invention discloses a titanium oxide nanotube-based lithium sulfide electrode and a preparation method thereof. The lithium sulfide electrode comprises a sheet-shaped titanium oxide nanotube array and lithium sulfide particles filled in titanium oxide nanotubes. And the lithium sulfide particles are coated with carbon layers. The lithium sulfide particles are coated with the carbon shell and the titanium oxide nanotube, the carbon shell and the titanium oxide nanotube have a space confinement effect on polysulfide lithium generated in the charging and discharging process, and the shuttle effect of the polysulfide lithium can be effectively inhibited. Meanwhile, the titanium oxide nanotube can inhibit the diffusion of polysulfide lithium through chemical bonding. And the one-dimensional tidily arranged titanium oxide nanotube array is beneficial to transportation of lithium ions. Besides, by utilizing the photoinduced super-hydrophilic performance of titanium oxide, the titanium oxide nanotube array is subjected to ultraviolet irradiation before being immersed into an aqueous solution of lithium sulfate and glucose, so that the aqueous solution of lithium sulfate and glucose can be fully injected into titanium oxide nanotubes, and finally the inhibition effect on the shuttle effect of polysulfide lithium is achieved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a titanium oxide nanotube-based lithium sulfide electrode and a preparation method thereof. Background technique [0002] Rechargeable batteries provide the necessary conditions for the utilization of renewable energy. At present, lithium-ion batteries are approaching their theoretical limit. In order to realize a more advanced charge-discharge battery, it is necessary for us to develop new electrode materials. Lithium sulfide is considered as a next-generation charge-discharge battery material because of its high theoretical specific capacity of 1165mAh / g. [0003] However, in order to realize the practical application of lithium sulfide electrodes, there are still some problems, mainly including: (1) the poor electronic conductivity of lithium sulfide and elemental sulfur, resulting in poor rate performance; (2) lithium polysulfide (Li 2 S x , 4≤x≤8) dissolution and dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/36H01M4/485H01M4/62
CPCY02E60/10
Inventor 冷丹李仕琦朱铧丞倪瑞黄澳旗
Owner HANGZHOU DIANZI UNIV
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