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Preparation method for anode of lithium-sulfur battery

A lithium-sulfur battery and cathode technology, which is applied in the field of electrochemical batteries, can solve the problems of large specific surface area of ​​carbon nanotubes, reduce the conductivity of the cathode, unfavorable conductive structure, etc., achieve large discharge specific capacity, improve adsorption, and improve utilization. Effect

Inactive Publication Date: 2011-09-28
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon nanotubes are easy to agglomerate due to their large specific surface area, which makes it difficult to disperse uniformly in the positive electrode, which is not conducive to building a good conductive structure; and the positive electrode contains polyvinylidene fluoride PVDF with poor conductivity, which will reduce the conductivity of the positive electrode. sex

Method used

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  • Preparation method for anode of lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Cut the nickel foil into discs with a diameter of 12 mm. Wipe the surface of the discs with acetone-absorbed cotton balls for 3 minutes, then put the discs into distilled water for ultrasonic cleaning for 3 minutes, and take them out to dry.

[0022] Put the dried nickel disc into the cavity of the microwave chemical vapor deposition device, and the reaction gas is H 2 and CH 4 , generated plasma by microwave excitation to decompose H 2 and CH 4 , the microwave power is 400W, H 2 and CH 4 The volume flows are 40sccm (ml / min under standard conditions) and 30sccm respectively, the reaction pressure is 2KPa, and the carbon fiber membrane is prepared on the surface of the nickel disc as a catalyst, and the preparation time is 40 minutes.

[0023] Sprinkle sulfur powder evenly on the surface of the prepared carbon fiber membrane. The mass of sulfur powder on each film-attached disc is 0.8g, and then put the disc into a tube furnace, keep it warm at 180°C for 4 hours in a...

Embodiment 2

[0025] Cut the iron foil into discs with a diameter of 13mm, first wipe the surface of the disc with acetone-absorbed cotton ball for 4 minutes, then put the disc into distilled water for ultrasonic cleaning for 3 minutes, take it out and dry it.

[0026] Put the dried iron disc into the cavity of the microwave chemical vapor deposition device, and the reaction gas is H 2 and CH 3 CH 2 OH vapor (by H 2 Carrying), plasma is generated by microwave excitation to decompose H 2 and CH 3 CH 2 OH vapor, microwave power 400W, H 2 and (H 2 +CH 3 CH 2 The volume flows of OH) are 30sccm and 80sccm respectively, the reaction pressure is 2.5KPa, and the iron disc is used as a catalyst to prepare a carbon fiber membrane on its surface, and the preparation time is 35 minutes.

[0027] Sprinkle sulfur powder evenly on the surface of the prepared carbon fiber membrane. The mass of sulfur powder on each film-attached disc is 1g, and then put the disc into a tube furnace, keep it warm a...

Embodiment 3

[0029] Cut the nickel foil into discs with a diameter of 11mm. Wipe the surface of the discs with acetone-absorbed cotton balls for 3 minutes, then put the discs into distilled water for ultrasonic cleaning for 3 minutes, and take them out to dry.

[0030] Put the dried nickel disc into the cavity of the hot wire chemical vapor deposition device, and the reaction gas is H 2 and CH 4 , decompose H through heat generated by the hot wire 2 and CH 4 , the heating wire power is 500W, H 2 and CH 4 The volume flows are 60sccm and 50sccm, respectively, the reaction pressure is 2KPa, and nickel discs are used as catalysts to prepare carbon fiber membranes on the surface, and the preparation time is 40 minutes.

[0031] Sprinkle sulfur powder evenly on the surface of the prepared carbon fiber membrane. The mass of sulfur powder on each film-attached disc is 1g, and then put the disc into a tube furnace, keep it warm at 190°C for 4h in an atmosphere filled with argon, and cool to Af...

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Abstract

The invention relates to a preparation method for an anode of a lithium-sulfur battery, which comprises the following steps of: (1) the pretreatment of a metal foil: cutting the metal foil, wiping a surface of a wafer by using an acetone-contained cotton ball, putting the wafer in distilled water for cleaning in ultrasound, and taking out and airing the wafer; (2) the preparation of a carbon fiber film: putting the wafer in a cavity of a chemical vapor deposition device, and preparing the carbon fiber film on the surface of the wafer through a method of decomposing or thermally decomposing a reaction gas by a plasma, wherein the wafer serves as a catalyst; and (3) the sulfurizing of the carbon fiber film: uniformly spreading sulfur powder on the surface of the carbon fiber film, putting a metal wafer in a tubular furnace to preserve the heat of the metal wafer in the atmosphere of argon, and cooling the wafer to the room temperature to prepare the anode of the lithium-sulfur battery. Compared with the prior art, the preparation method has the advantage of being capable of greatly improving anode conductivity and polysulfide adsorbability, and therefore, large specific discharge capacity and high circular anode discharge stability are obtained; in addition, the anode is in no need of drying, so that the preparation method has the advantage of saving time.

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 battery is a secondary battery that utilizes the chemical reaction between lithium and sulfur. Its negative electrode is metal lithium sheet, and its positive electrode is a sulfur-containing material. When discharging, the negative electrode generates lithium ions, and the sulfur in the positive electrode reacts with lithium ions to form sulfide. When charging, the positive and negative reactions are reversed. The theoretical mass specific capacity of elemental sulfur is 1675mAh / g, which is higher than the theoretical discharge specific capacity (LiCoO 2 , LiNiO 2 and LiMn 2 o 4 The theoretical discharge specific capacities are 274mAh / g, 274mAh / g and 148mAh / g respectively). In addition, elemental sulfur is cheap and environmentally friendly, which makes l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 王传新杨学兵汪建华陈云峰谢秋实
Owner WUHAN INSTITUTE OF TECHNOLOGY
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