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Preparation method of S/C composite material used in positive pole of Li-S battery

A technology of carbon composite materials and lithium-sulfur batteries, which is applied in battery electrodes, circuits, electrical components, etc., can solve problems such as troublesome gas swelling, suppress the loss of active materials, improve cycle stability and rate performance, and overcome sulfur distribution uneven effect

Inactive Publication Date: 2015-07-08
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fatal disadvantage of this method is that the additive lipoic acid will generate hydrogen at the same time during the polymerization process, therefore, it will cause a very troublesome gas swelling problem during the charging and discharging process of the battery.

Method used

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  • Preparation method of S/C composite material used in positive pole of Li-S battery
  • Preparation method of S/C composite material used in positive pole of Li-S battery
  • Preparation method of S/C composite material used in positive pole of Li-S battery

Examples

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Effect test

Embodiment 1

[0031] A preparation method of a sulfur / carbon composite material for a positive electrode of a lithium-sulfur battery, the steps are as follows:

[0032] (1) Acid treatment of mesoporous carbon: 0.25 g of mesoporous carbon was added to a round-bottomed flask, and then 15 mL of concentrated sulfuric acid (18M) and 5 mL of concentrated nitric acid (16M) were sequentially added. The reaction was stirred at 50 °C for 5 h, after cooling, suction filtration, washed with water until neutral, and vacuum dried at 80 °C, and the obtained sample was recorded as A-MC.

[0033] (2) Preparation of sulfur / mesoporous carbon composite material: After mixing and grinding the A-MC obtained in step (1) and sulfur in a mass ratio of 3:2, put it into a closed 10 mL reaction kettle filled with argon. , heat treatment at 180 °C for 12 h in a muffle furnace to obtain the sulfur / mesoporous carbon composite material, denoted as A-MCS.

[0034] As a control, mesoporous carbon (denoted as MC) was direct...

Embodiment 2

[0043] A preparation method of a sulfur / carbon composite material for a positive electrode of a lithium-sulfur battery, the steps are as follows:

[0044] (1) Acid treatment of carbon black: add 0.25 g of carbon black to a round-bottomed flask, and then add 15 mL of concentrated sulfuric acid and 5 mL of concentrated nitric acid in sequence. The reaction was stirred at 50 °C for 5 h, after cooling, suction filtered, washed with water until neutral, and dried under vacuum at 80 °C.

[0045] (2) preparation of sulfur / carbon black composite material: after the carbon black obtained in step (1) and sulfur are mixed and ground in a mass ratio of 3:2, put into a closed 10mL reactor filled with argon, Heat treatment at 180° C. for 12 h in a muffle furnace to obtain the sulfur / carbon black composite material.

[0046] The prepared sulfur / carbon black composite material was tested and characterized similarly to Example 1, and the conclusion was basically similar to that of Example 1. ...

Embodiment 3

[0048] A preparation method of a sulfur / carbon composite material for a positive electrode of a lithium-sulfur battery, the steps are as follows:

[0049] (1) Acid treatment of carbon nanotubes: 0.25 g of carbon nanotubes were added to a round-bottomed flask, and then 15 mL of concentrated sulfuric acid and 5 mL of concentrated nitric acid were sequentially added. The reaction was stirred at 50 °C for 5 h, after cooling, suction filtered, washed with water until neutral, and dried under vacuum at 80 °C.

[0050] (2) Preparation of sulfur / carbon nanotube composite material: After mixing and grinding the carbon nanotubes obtained in step (1) and sulfur in a mass ratio of 3:2, put them into a closed 10mL reaction kettle filled with argon. , heat treatment in a muffle furnace at 180° C. for 12 h to obtain the sulfur / carbon nanotube composite material.

[0051] The prepared sulfur / carbon nanotube composites were tested and characterized similarly to Example 1, and the conclusions ...

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Abstract

The invention discloses a preparation method of an S / C composite material used in a positive pole of a Li-S battery. The S / C composite material is formed by compositing a carbon carrier and elemental sulfur. The preparation method includes following steps: (A) pre-treating the carbon carrier with an acid; and (B) supporting the elemental sulfur onto the carbon carrier as a carrier at a high temperature to obtain the S / C composite material. In the preparation method, by means of electronegativity of oxygen-containing groups (such as a carboxyl group, a carbonyl group, a hydroxyl group and the like) being rich in the carbon carrier pre-treated by the acid and a large specific surface area, effective immobilization of a sulfur active substance is achieved, thereby more effectively inhibiting loss of the active substances during charging / discharging of a positive pole material. The circulation stability and rate capability of an electrode can be greatly improved, thereby obtaining the high-performance S / C composite positive pole material.

Description

technical field [0001] The invention relates to a lithium-sulfur battery positive electrode material, in particular to a preparation method of a sulfur / carbon composite material for a lithium-sulfur battery positive electrode. Background technique [0002] The increasingly commercialized lithium-ion secondary battery is limited by its theoretical capacity and cannot further significantly improve its energy density, and the fuel cell is still difficult to be practical in a short period of time, and the currently mastered technology is far from meeting the needs of development. Therefore, there is an urgent need to research and develop new chemical power sources with higher energy density, longer cycle life, low cost, and environmental friendliness. [0003] Lithium-sulfur secondary batteries (referred to as lithium-sulfur batteries) with metal lithium as the negative electrode and elemental sulfur as the positive electrode active material have received extensive attention due...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/362H01M4/38H01M4/62Y02E60/10
Inventor 吴平周云云周益明唐亚文
Owner NANJING NORMAL UNIVERSITY
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