Preparation method of nanotube array positive electrode material of lithium sulphur battery

A technology of nanotube arrays and positive electrode materials, applied in battery electrodes, electrolytic organic material coatings, electrolytic inorganic material coatings, etc., can solve the problems of low specific capacity and poor conductivity, and achieve increased sulfur loading, improved conductivity, Coulombic The effect of stable efficiency

Active Publication Date: 2014-06-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a preparation method of a lithium-sulfur battery nanotube array positive electrode material, which solves the problems of poor conductivity and low specific capacity existing in the existing lithium-sulfur battery positive electrode materials

Method used

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  • Preparation method of nanotube array positive electrode material of lithium sulphur battery
  • Preparation method of nanotube array positive electrode material of lithium sulphur battery
  • Preparation method of nanotube array positive electrode material of lithium sulphur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1, including the step of preparing a titanium dioxide nanotube array, the step of depositing a conductive enhancing material and the step of depositing elemental sulfur:

[0055] (1) The step of preparing titanium dioxide nanotube arrays includes the following sub-steps:

[0056] (1.1) Titanium sheet treatment: Polish both sides of the titanium sheet with a purity of 99.8%, then ultrasonically clean it with acetone, distilled water, and absolute ethanol in order to remove surface oil, and finally wash it with N 2 blow dry;

[0057] (1.2) Preparation of electrolyte: mix NH 4 F Add mixed solvent, stir magnetically, make NH 4 F is completely dissolved in the mixed solvent to form an electrolyte; the mixed solvent is a mixed solution of distilled water and ethylene glycol, and the volume percentage of distilled water in the mixed solution is 2vol%; the NH 4 The mass percentage of F accounting for the electrolyte is 0.25Wt%;

[0058] (1.3) The first step of ox...

Embodiment 2

[0070] Embodiment 2, including the step of preparing a titanium dioxide nanotube array, the step of depositing a conductive enhancing material and the step of depositing elemental sulfur:

[0071] (1) The step of preparing titanium dioxide nanotube arrays includes the following sub-steps:

[0072] (1.1) Titanium sheet treatment: Polish both sides of the titanium sheet with a purity of 99.8%, then ultrasonically clean it with acetone, distilled water, and absolute ethanol in order to remove surface oil, and finally wash it with N 2 blow dry;

[0073] (1.2) Preparation of electrolyte: mix NH 4 F Add mixed solvent, stir magnetically, make NH 4 F is completely dissolved in the mixed solvent to form an electrolyte; the mixed solvent is a mixed solution of distilled water and ethylene glycol, and the volume percentage of distilled water in the mixed solution is 2vol%; the NH 4 The mass percentage of F accounting for the electrolyte is 0.25Wt%;

[0074] (1.3) The first step of ox...

Embodiment 3

[0086] Embodiment 3, including the step of preparing a titanium dioxide nanotube array, the step of depositing a conductive enhancing material and the step of depositing elemental sulfur:

[0087] (1) The step of preparing titanium dioxide nanotube arrays includes the following sub-steps:

[0088] (1.1) Titanium sheet treatment: Polish both sides of the titanium sheet with a purity of 99.8%, then ultrasonically clean it with acetone, distilled water, and absolute ethanol in order to remove surface oil, and finally wash it with N 2 blow dry;

[0089] (1.2) Preparation of electrolyte: mix NH 4 F Add mixed solvent, stir magnetically, make NH 4 F is completely dissolved in the mixed solvent to form an electrolyte; the mixed solvent is a mixed solution of distilled water and ethylene glycol, and the volume percentage of distilled water in the mixed solution is 2vol%; the NH 4 The mass percentage of F accounting for the electrolyte is 0.25Wt%;

[0090] (1.3) The first step of ox...

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Abstract

The invention relates to a preparation method of a nanotube array positive electrode material of a lithium sulphur battery, which belongs to a preparation method of positive electrode materials of lithium sulphur batteries and solves the problems, such as poor electrical conductivity and low specific capacity, of an existing positive electrode material of a lithium sulphur battery. The preparation method comprises the following steps: (1) preparing a titanium dioxide nanotube array, (2) depositing a conductive reinforcing material, and (3) depositing elemental sulphur, wherein the steps (2) and (3) can be repeated to form a multiple depositional cycle period, so that a positive electrode material with a multilayer coaxial heterostructure is obtained, and has different sulphur loading capacities. According to the preparation method, the titanium dioxide nanotube array is taken as a substrate material, and the conductive reinforcing material and the elemental sulphur are compounded and deposited and enter titanium dioxide nanotubes to form the positive electrode material with the coaxial heterostructure, so that the conductivity of the positive electrode material is improved, the sulphur loading capacity of the positive electrode material is improved, the cycling performance and specific capacity of a lithium sulphur battery are further improved, and the preparation method has certain impelling action for speeding up the further large scale application process of the sulphated lithium battery.

Description

technical field [0001] The invention belongs to a preparation method of a lithium-sulfur battery cathode material, in particular to a preparation method of a lithium-sulfur battery nanotube array cathode material. Background technique [0002] Energy crisis and environmental pollution have become two bottlenecks restricting the development of human society. It is predicted that the earth's current proven oil reserves are only enough for human use for 50 years. In order to reduce dependence on traditional fossil energy, renewable energy such as solar energy, wind energy, and tidal energy have been widely valued, researched, and utilized. In the process of effective utilization of renewable energy, it is urgent to solve the problem of energy storage and transmission, which increasingly highlights the important position of the battery in the development of the new energy industry, and the positive electrode material is the core component of the battery, and its material perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62C25D11/26C25D9/02C25D5/54C25D9/08
CPCC25D5/54C25D9/02C25D9/08C25D11/26H01M4/0442H01M4/0452H01M4/0497H01M4/139H01M4/624Y02E60/10
Inventor 朱文王慧勇
Owner HUAZHONG UNIV OF SCI & TECH
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