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Sulfur electrode, and preparation and application thereof

A sulfur electrode and electrode technology, which is applied in the field of energy storage, can solve the problems that cannot fully meet the requirements of Li-S batteries, and achieve the effects of improving electrochemical performance, increasing electrode reaction rate, and increasing specific capacity

Active Publication Date: 2013-01-30
中科派思储能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a variety of carbon materials have been applied to the development of sulfur / carbon composite materials, and the electrochemical performance and cycle stability of the material have been improved to a certain extent, they still cannot fully meet the requirements of Li-S batteries.

Method used

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  • Sulfur electrode, and preparation and application thereof
  • Sulfur electrode, and preparation and application thereof
  • Sulfur electrode, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (1) Preparation of sulfur / carbon composite material: Weigh 0.1g of self-made porous carbon, the specific surface area of ​​the carbon material is 1382m 2 / g, the pore volume is 2.2cm 3 / g, wherein the volume ratio of micropores to mesopores is: 1:1.28, and 1.0 g of elemental sulfur is put into an agate mortar and mixed evenly, transferred to a ball mill jar for ball milling for 2 hours, the ball-to-material ratio is 1:0.15, and the milling speed is 300r. / min. Heat the obtained mixture in a tube furnace to obtain the prepared sulfur / carbon composite material. The heating program was as follows: the temperature was raised from room temperature to 130° C. and kept for 3 hours, then the temperature was raised to 260° C. and kept for 3 hours. The heating rate was 3° C. / min. The sulfur content in the final composite was 40.2 wt%.

[0062] (2) Preparation of sulfur electrode: mix sulfur / carbon composite material, AB and PTFE according to the mass ratio of 7:1.5:1.5, add 3m...

Embodiment 2

[0065] Acid-modified porous carbon materials, using the modified carbon materials to prepare sulfur / carbon composite materials, and using the composite materials to prepare positive electrodes and assemble Li-S batteries, the preparation method is as follows:

[0066] (1) Modification of carbon materials: pipette a certain mass of concentrated nitric acid (60% concentration) to make a 5% nitric acid aqueous solution; weigh 1g of porous carbon (specific surface area is 1382m 2 / g) Add 50mL of 5% nitric acid solution, stir at a constant temperature of 30°C for 4h, then wash with deionized water until neutral, dry and weigh.

[0067] (2) Preparation of sulfur / carbon composite material: Weigh 0.1g of acid-modified porous carbon material, the specific surface area of ​​carbon material is 1237m 2 / g, pore volume 1.79cm 3 / g, wherein the volume ratio of micropores to mesopores is: 1:4.8, and 1.0 g of elemental sulfur is put into an agate mortar and mixed evenly, transferred to a ball...

Embodiment 3

[0071] Acid-modified and calcined carbon materials, using the modified carbon materials to prepare sulfur / carbon composite materials, and using the composite materials to prepare positive electrodes and assemble Li-S batteries, the preparation method is as follows:

[0072] (1) Modification of carbon materials: pipette a certain mass of concentrated nitric acid (60% concentration) to make a 5% nitric acid aqueous solution; weigh 1g of porous carbon (specific surface area is 1382m 2 / g) Add 50mL of 5% nitric acid solution, stir at a constant temperature of 30°C for 4h, then wash with deionized water until neutral, dry and weigh. The obtained carbon powder was calcined at 700° C. for 3 h under the protection of an argon atmosphere to further obtain an acid-modified and calcined carbon material.

[0073] (2) Preparation of sulfur / carbon composite material: Weigh 0.1g of acid-modified porous carbon material, the specific surface area of ​​carbon material is 1143m 2 / g, pore volum...

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Abstract

A sulfur electrode, and preparation and application thereof. The sulfur electrode comprises a sulfur / carbon composite, a conductive agent and a binder, wherein the sulfur is an electrode active material. The content of sulfur / carbon composite in the electrode is 10-95%; a mass ratio of sulfur to porous carbon material in the sulfur / carbon composite is 1:0.05-19; the porous carbon material in the sulfur / carbon composite has conductivity greater than or equal to 0.1S / cm, specific surface area greater than or equal to 500 m<2> / g, and pore volume greater than or equal to 0.3cm<3> / g; and the pore structure comprises microporous and mesoporous. The porous carbon material is treated by an acid modification method, in which a mass fraction of acid is 1-50%. The sulfur electrode prepared by the method provided by the invention has advantages of high specific energy, excellent cycle stability, cheap and easily available electrode material, and simple and practical preparation method, and can be applied to a secondary battery.

Description

technical field [0001] The invention belongs to the field of energy storage and relates to a secondary battery, in particular to a sulfur electrode for a high specific energy lithium-sulfur secondary battery and its preparation and application. Background technique [0002] Among the commercialized secondary batteries, lithium-ion secondary batteries have the highest specific energy, specific power and good cycle life, and have been widely used in portable electronic devices, backup power supplies, uninterruptible power supplies, etc. and the first choice for energy storage batteries. [0003] With the development of science and technology, electric vehicles and advanced portable electronic communication equipment have put forward higher requirements on the specific energy of the secondary battery used. For example, the specific energy of power batteries required for pure electric vehicles should be at least greater than 300Wh / kg, and the specific energy of batteries requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/38H01M4/62H01M4/139
CPCY02E60/122Y02E60/10
Inventor 陈剑庄鑫廖文明
Owner 中科派思储能技术有限公司
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