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Method for preparing anode of lithium sulfur battery

A lithium-sulfur battery and positive electrode technology, applied in the field of electrochemical batteries, can solve the problems of battery performance degradation, reduced positive electrode conductivity, unfavorable sulfur conductivity, etc., and achieve the effects of high battery discharge specific capacity and cycle stability improvement.

Inactive Publication Date: 2011-01-26
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption of sulfur by mesoporous carbon on the positive electrode plays a certain role in inhibiting the dissolution of sulfur ions in the electrolyte. However, mesoporous carbon does not have good conductivity due to its porous structure, and the mixture of sulfur and mesoporous carbon in close contact The conductivity is lower than the conductivity of the mixture of sulfur and conductive agent in direct contact, which is not conducive to the improvement of sulfur conductivity
In addition, the positive electrode contains binder LA132 (a water-based binder) with poor conductivity, which will reduce the conductivity of the positive electrode and reduce the performance of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Cut the copper foil with a flat surface into a disc with a diameter of 11mm, wipe the disc with a cotton ball soaked in acetone for 2 minutes, then ultrasonically clean it with distilled water for 3 minutes, take it out and dry it;

[0019] Put the treated copper foil into the cavity of a DC magnetron sputtering device. The target used for sputtering is a high-purity graphite target with a diameter of 50 mm. The distance between the target and the copper foil is adjusted to 60 mm. The steam is carried into the cavity, and the air pressure in the cavity is reduced to 1×10 before the gas is introduced. -3 Pa; when ventilating, adjust the total flow rate of nitrogen and carbon disulfide vapor to 20 sccm (ml / min under standard conditions), control the pressure in the chamber to 0.6 Pa, and adjust the sputtering power to 150W. Plasma is formed under the action of radio frequency voltage, and the ionized sputtering gas sputters the high-purity graphite target, deposits a carb...

Embodiment 2

[0021] Cut the nickel foil with a flat surface into a disc with a diameter of 13mm, wipe the disc with a cotton ball soaked in acetone for 2 minutes, then ultrasonically clean it with distilled water for 3 minutes, take it out and dry it;

[0022] Put the treated nickel foil into the cavity of the DC magnetron sputtering device. The target used for sputtering is a high-purity graphite target with a diameter of 50 mm. The distance between the target and the nickel foil is adjusted to 60 mm. The carbon disulfide vapor is carried into the chamber, and the air pressure in the chamber is reduced to 1×10 before the gas is introduced. -3 Pa; adjust the total flow of argon and carbon disulfide vapor to 30 sccm during ventilation, control the pressure in the chamber to 0.8Pa, adjust the sputtering power to 160W, and the sputtering gas forms plasma under the action of DC voltage or RF voltage input by the sputtering device The ionized sputtering gas sputters the high-purity graphite tar...

Embodiment 3

[0024] Cut the aluminum foil with a flat surface into a disc with a diameter of 12mm, wipe the disc with a cotton ball soaked in acetone for 2 minutes, then ultrasonically clean it with distilled water for 3 minutes, take it out and dry it;

[0025] Put the processed aluminum foil into the cavity of the radio frequency magnetron sputtering device. The target used for sputtering is a high-purity graphite target with a diameter of 50 mm. The distance between the target and the aluminum foil is adjusted to 50 mm. The carbon disulfide vapor is carried by nitrogen gas. To the cavity, the air pressure in the cavity before the gas is introduced is reduced to 1×10 -3 Pa; adjust the total flow of nitrogen and carbon disulfide vapor to 50 sccm during ventilation, control the pressure in the chamber to 1.2Pa, adjust the sputtering power to 170W, and the sputtering gas forms plasma under the action of DC voltage or RF voltage input by the sputtering device , the ionized sputtering gas spu...

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Abstract

The invention relates to a method for preparing an anode of a lithium sulfur battery, which comprises the following steps of: 1) pretreating a metal sheet: cutting the metal sheet with neat surface into a circular sheet, cleaning by using cotton balls absorbed with acetone, performing ultrasonic cleaning by using distilled water, taking out, and airing; and 2) preparing a carbon sulfur composite material: putting the treated metal sheet into a cavity of a sputtering device, carrying carbon disulfide vapor into the cavity by using sputtering gas, forming plasma by using the sputtering gas, sputtering high-purity graphic target by using the sputtering gas, depositing a carbon film on the pretreated metal sheet, decomposing the carbon disulfide vapor in the plasma formed by the sputtering gas, depositing the generated sulfur and carbon sulfur groups in the carbon film to realize sulfur doping, and preparing the carbon sulfur composite material through deposition, wherein the metal sheet on which the carbon sulfur composite material is deposited is the anode of the lithium sulfur battery. The preparation method is favorable for improving the cyclical stability of the battery, and can avoid reduction of conductivity of the anode caused by an adhesive and shorten the preparation period of the anode of the battery.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode of a lithium-sulfur battery, belonging to the field of electrochemical batteries. Background technique [0002] Lithium-sulfur batteries are lithium metal sheets at the negative pole, and sulfur is used as the active material at the positive pole. During discharge, the lithium ions generated at the negative electrode diffuse to the positive electrode and react with sulfur to form lithium sulfide. Under the applied voltage, the above-mentioned electrode reaction can be reversed, so as to realize the charging of the battery. The theoretical mass specific capacity of elemental sulfur is 1675mAh / g, while the transition metal oxide LiCoO commonly used in lithium-ion batteries 2 , LiNiO 2 and LiMn 2 o 4 The theoretical specific capacities are 275 mAh / g, 274 mAh / g and 148 mAh / g, respectively. In addition, sulfur is cheap. With the improvement of portable electronic products' requireme...

Claims

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Application Information

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IPC IPC(8): H01M4/139
CPCY02E60/122Y02E60/10
Inventor 王传新杨学兵汪建华王升高张行
Owner WUHAN INSTITUTE OF TECHNOLOGY
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