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Preparation method of lithium-sulphur battery electrode

A lithium-sulfur battery and electrode technology, which is applied in the field of preparation of lithium-sulfur battery electrodes, can solve the problems of limiting the practical use of lithium-sulfur batteries, reducing the energy density of electrodes, and unavoidable contact resistance, etc., to achieve the suppression of shuttle effect and the improvement of energy density , Improve the effect of mechanical properties and electrochemical properties

Active Publication Date: 2014-12-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above process requires sufficient control and precise mixing, and the process is complex
In addition, the active materials and the current collectors are stuck together by adhesives, and the contact resistance is inevitable; at the same time, due to the addition of inactive materials such as conductive agents, binders and current collectors, it is equivalent to reducing the contact resistance in the electrode. Sulfur content, the energy density of the electrode is greatly reduced, which greatly limits the further practical use of lithium-sulfur batteries

Method used

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  • Preparation method of lithium-sulphur battery electrode
  • Preparation method of lithium-sulphur battery electrode
  • Preparation method of lithium-sulphur battery electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A filter paper sheet with a thickness of 20 microns and a mass of 0.02 g was immersed in 0.5 mol / L n-butyl titanate solution for 3 hours, then taken out to dry at 100°C, and then placed in water for hydrolysis reaction to obtain nano-titanium dioxide supported on The composite body on the paper sheet; the obtained composite body is placed under a nitrogen protective atmosphere and heated to 800 ° C for carbonization for 5 hours to obtain a titanium dioxide (62wt%) composite current collector with a carbon fiber network structure as a self-supporting body; in the resulting carbon fiber network structure Add 5.0mL of 4.0mol / L sulfur-containing carbon disulfide solution to the surface of the self-supporting titanium dioxide composite current collector, first dry at 60°C in a drying oven to remove carbon disulfide, and then place it in a tube furnace under a nitrogen protective atmosphere and heat it up to 155°C for heat treatment After 10 hours, a lithium-sulfur battery ele...

Embodiment 2

[0041] Put a printing paper sheet with a thickness of 50 microns and a mass of 0.075 g into a 0.1 mol / L n-butyl titanate solution and soak it for 0.5 hours, take it out to dry at 60°C, and then put it in water for hydrolysis reaction to obtain nano-titanium dioxide loaded The composite body on the paper sheet; the obtained composite body is placed in an argon protective atmosphere and heated to 600 ° C for carbonization for 10 hours to obtain a titanium dioxide (25wt%) composite current collector with a carbon fiber network structure as a self-supporting body; Add 6.0mL of 0.5mol / L sulfur-containing carbon disulfide solution to the surface of the self-supporting titanium dioxide composite current collector, dry at 40°C in a drying oven to remove carbon disulfide, and then place the temperature in a tube furnace to 400°C under a nitrogen protective atmosphere. ℃ heat treatment for 8 hours to obtain a lithium-sulfur battery electrode with a sulfur mass content of 60%. The lithiu...

Embodiment 3

[0043] Put a piece of writing paper with a thickness of 10 microns and a mass of 0.01 g into a 2.0 mol / L n-butyl titanate solution and immerse it for 5 hours, take it out and dry it at 100°C, and then put it in water for hydrolysis reaction to obtain nano-titanium dioxide loaded Composite body on the paper sheet; Gained composite body is heated to 1000 ℃ under argon protective atmosphere and carries out carbonization 2 hours, obtains the titanium dioxide (70wt%) composite current collector with carbon fiber network structure as self-supporting body; Gained with carbon fiber The titanium dioxide composite current collector with a self-supporting network structure is soaked in a 2mol / L sulfur-containing carbon disulfide solution, dried in a drying oven at 50°C to remove carbon disulfide, and then placed in a tube furnace and heated to 150°C under a nitrogen protective atmosphere After heat treatment for 4 hours, a lithium-sulfur battery electrode with a sulfur mass content of 68%...

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Abstract

The invention discloses a preparation method of a lithium-sulphur battery electrode. The preparation method of the lithium-sulphur battery electrode comprises the following steps: putting a piece of paper into a titanate solution for dipping, drying the taken paper, and then putting the paper in water for carrying out hydrolysis reaction to obtain a nano-titanium dioxide complex loaded on the paper; putting the complex in a protection atmosphere for heating and cabonizing, adding a sulfurated carbon disulfide solution on the surface of a titanium dioxide complex current collector which is obtained by carbonizing and takes a carbon fiber network structure as a self support body, or soaking the surface of the titanium dioxide complex current collector which is obtained by carbonizing and takes the carbon fiber network structure as the self support body in the sulfurated carbon disulfide solution, drying and carrying out heat treatment to obtain the lithium-sulphur battery electrode which is high in mechanical performance, large in sulfur fixation amount and good in sulfur fixation effect. The electrode is directly used for preparing a lithium-sulphur battery with the excellent electrochemical performance and the high energy density in the absence of an adhesive and a corresponding coating process. The preparation method is easy to operate, environmentally-friendly, low in cost, liable to industrially implement and suitable for mass production.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery electrode, belonging to the field of lithium batteries. Background technique [0002] With the popularization of portable electronic products, the rapid development of energy storage technology and electric vehicles, the requirements for the energy density and power density of lithium batteries are getting higher and higher. It is predicted that the future 4G mobile communication requires the energy density of the battery to reach more than 500Wh / Kg. Lithium-sulfur batteries have high specific capacity (1675mAh / g) and high energy density (2600Wh / kg), and the positive electrode material elemental sulfur is rich in resources, low in price, and environmentally friendly. Therefore, lithium-sulfur batteries are high-energy-density secondary batteries with great development potential and application prospects. [0003] However, lithium-sulfur batteries currently have some problems th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66
CPCH01M4/139H01M4/663H01M4/667Y02E60/10
Inventor 张治安李强蒋绍峰杨幸章智勇赖延清李劼
Owner CENT SOUTH UNIV
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