A kind of preparation method of sulfur positive electrode of lithium-sulfur battery

A technology of lithium-sulfur batteries and sulfur cathodes, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance, low electrochemical activity, and poor reversibility of cathode materials, and achieve good electrochemical performance.

Inactive Publication Date: 2011-12-14
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of a rechargeable and dischargeable sulfur cathode material, which overcomes the disadvantages of low electrochemical activity and poor reversibility of the p

Method used

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  • A kind of preparation method of sulfur positive electrode of lithium-sulfur battery
  • A kind of preparation method of sulfur positive electrode of lithium-sulfur battery
  • A kind of preparation method of sulfur positive electrode of lithium-sulfur battery

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Effect test

Embodiment 1

[0035] Configure 10g of the mixture according to sublimated sulfur: activated carbon=4:2 (mass ratio), add 100g of absolute ethanol, mix evenly in a ball mill, filter the obtained mixed slurry into a glass vessel, and place in a vacuum oven to dry Dry, after drying, move it into a mortar and grind it evenly for later use. The resulting mixture was evenly dispersed in sodium bicarbonate solution, and ultrasonically oscillated to make it evenly mixed.

[0036] According to sulfur-carbon mixture: aluminum element in aluminum sulfate = 100:0.5 (molar ratio), add aluminum sulfate solution under mechanical stirring, filter after fully reacting, wash with distilled water, put it in a vacuum drying oven and dry it fully, then put it into a tube type furnace, under the protection of nitrogen, the temperature was gradually raised to 140°C within 11 hours. After the mixture is cooled down to normal temperature, the composite material obtained above is taken out from the tube furnace and...

Embodiment 2

[0039] Configure 10g of the mixture according to sublimated sulfur: activated carbon=9:2 (mass ratio), add 100g of absolute ethanol, mix evenly in a ball mill, filter the obtained mixed slurry into a glass vessel, and place in a vacuum oven to dry Dry, after drying, move it into a mortar and grind it evenly for later use. The resulting mixture was evenly dispersed in ammonia solution, and ultrasonically oscillated to make it evenly mixed.

[0040] According to sulfur-carbon mixture: aluminum element in aluminum nitrate = 100:1.0 (molar ratio), add aluminum nitrate solution under mechanical stirring, filter after fully reacting, wash with distilled water, put it in a vacuum drying oven and dry it fully, put it into a tube type The furnace was gradually heated to 300°C within 6 hours under the protection of nitrogen. After the mixture is cooled down to normal temperature, the composite material obtained above is taken out from the tube furnace and ground evenly to obtain a sulf...

Embodiment 3

[0043]Configure 10g of the mixture according to sublimated sulfur: activated carbon=6:2 (mass ratio), add 100g of absolute ethanol, mix evenly in a ball mill, filter the obtained mixed slurry into a glass vessel, and place in a vacuum oven to dry Dry, after drying, move it into a mortar and grind it evenly for later use. The resulting mixture was evenly dispersed in sodium bicarbonate solution, and ultrasonically oscillated to make it evenly mixed.

[0044] According to sulfur carbon mixture: aluminum element in aluminum chloride = 100: 1.5 (molar ratio), add aluminum chloride solution under mechanical stirring, filter after fully reacting, wash with distilled water, put it in a vacuum drying oven and dry it fully, put In a tube furnace, the temperature was gradually raised to 280°C within 8 hours under the protection of argon. After the mixture is cooled down to normal temperature, the composite material obtained above is taken out from the tube furnace and ground evenly to ...

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Abstract

The invention provides a preparation method of a sulfur positive electrode of a lithium sulfur battery. The preparation method comprises the following steps: a) preparing a mixed slurry according to the condition that the mass ratio of a sublimed sulfur to an active carbon is (4-9):2; b) drying and grinding the mixed slurry; c) dispersing the mixture in a sodium bicarbonate or ammonia solution, and performing the ultrasonic oscillation; d) adding an aluminum sulfate, aluminum chloride or aluminum potassium sulfate solution according to the condition that the mol ratio of a sulfur carbon mixture to an aluminum element in aluminum salt is 100:(0.5-3) so as to prepare a composite material covered by the aluminum hydroxide; e) filtering and drying the composite material, warming to 140-300 DEG C within 6-11 hours under the protection of inert gas, and grinding to obtain the sulfur carbon positive electrode material covered by the aluminum oxide for the lithium sulfur battery; and f) preparing the positive electrode of the lithium sulfur battery, assembling and testing the performance of the battery. The initial discharging specific capacity of the sulfur positive electrode composite material for the lithium sulfur battery prepared by the invention can achieve 1441.7.8 mAh/g, the battery discharging specific capacity is still maintained at 808.1mAh/g at room temperature after ten times of circulation, and the capacity retention rate can achieve 56.52%.

Description

technical field [0001] The invention relates to a lithium-sulfur battery, in particular to a method for preparing a sulfur cathode of the lithium-sulfur battery. Background technique [0002] Today, the "bottleneck" that limits the capacity of lithium batteries is the cathode material of lithium batteries, and people's enthusiasm for research on this has continued unabated. Elemental sulfur has the electrochemical ability of multi-electron reduction reaction, and the relative atomic mass of sulfur is small, so elemental sulfur has a high theoretical specific capacity as high as 1675mAh / g, and the theoretical battery energy density of lithium-sulfur batteries can reach 2600W / kg, which is far larger than the existing commercialized secondary batteries. The working voltage of lithium-sulfur batteries is around 2.1V, which can be used in most occasions. Secondly, sulfur resources are abundant and cheap. [0003] Sulfide-containing cathode materials have become one of the most ...

Claims

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Application Information

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IPC IPC(8): H01M4/139
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 单忠强李翠丽杨兰生田建华周雨方章涛
Owner TIANJIN UNIV
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