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Core-shell structured carbon/sulfur composite positive electrode material, preparation method and application therefor

A technology of composite cathode material and core-shell structure, applied in the field of electrochemistry, can solve the problems of high production cost, low sulfur loading, poor stability, etc., and achieve the effects of improving utilization rate, solving volume expansion, and being environmentally friendly.

Inactive Publication Date: 2016-06-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some deficiencies in the products and preparation methods of cathode materials for lithium-sulfur batteries currently reported, such as low sulfur loading, poor stability, etc., and the process is complicated and the production cost is high.

Method used

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  • Core-shell structured carbon/sulfur composite positive electrode material, preparation method and application therefor
  • Core-shell structured carbon/sulfur composite positive electrode material, preparation method and application therefor
  • Core-shell structured carbon/sulfur composite positive electrode material, preparation method and application therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The positive electrode material of lithium-sulfur battery with porous core-shell structure in the shell wall of this embodiment has an average pore diameter of 9.28nm and a pore volume of 0.709cm 3 / g.

[0027] The preparation method of the lithium-sulfur battery cathode material of this example, the specific steps are:

[0028] (1) Add 1.5ml of ammonia water, 60ml of ethanol, 150ml of deionized water, 1.5g of resorcinol, and 1.5g of CTAB into a round bottom flask and stir for 30min. Then 7.5ml TEOS and 2.1ml formaldehyde were added, stirred at 25°C for 24h, and then stood in an oil bath at 100°C for 24h. The reaction product was obtained by suction filtration, dried in a thermostat at 60°C for 8 hours, and dried in a tube furnace for N 2 Carburize at 700°C for 3 hours in the atmosphere, with a heating rate of 2°C / min, and finally etch in 5mol / L NaOH at 80°C for 10 hours to remove SiO 2 , after washing, suction filtration and drying, a porous core-shell structure car...

Embodiment 2

[0037] The preparation method of the lithium-sulfur cathode material in this embodiment, the specific steps are:

[0038](1) Add 0.15ml of ammonia water, 6ml of ethanol, 18ml of deionized water, 0.15g of resorcinol, and 0.15g of sodium dodecylsulfonate into a round bottom flask and stir for 30min. Then add 0.75ml TEOS and 0.21ml formaldehyde, stir at 25°C for 24h, then stand in an oil bath at 100°C for 24h. The reaction product was obtained by suction filtration, dried in a thermostat at 60°C for 8 hours, and dried in a tube furnace for N 2 Carburize at 600°C for 4 hours in the atmosphere, with a heating rate of 5°C / min, and finally etch in 8mol / L NaOH at 80°C for 10 hours to remove SiO 2 , after washing, suction filtration and drying, a porous core-shell structure carbon material with a shell wall is obtained.

[0039] (2) Put 0.15 g of the prepared carbon material and 0.15 g of sublimed sulfur into an agate ball mill jar, control the rotational speed of the planetary ball ...

Embodiment 3

[0047] The preparation method of the lithium-sulfur cathode material in this embodiment, the specific steps are:

[0048] (1) Add 0.3ml of ammonia water, 12ml of ethanol, 30ml of deionized water, 0.3g of resorcinol, and 0.6g of TX-100 into a round bottom flask and stir for 30min. Then 1.5ml TEOS and 0.42ml formaldehyde were added, stirred at 25°C for 24h, and then stood in an oil bath at 100°C for 24h. The reaction product was obtained by suction filtration, dried in a thermostat at 60°C for 8 hours, and dried in a tube furnace for N 2 Carburize at 500°C for 8h in the atmosphere, the heating rate is 3°C / min, and finally etch in 8mol / L NaOH at 80°C for 10h to remove SiO 2 , after washing, suction filtration and drying, a porous core-shell structure carbon material with a shell wall is obtained.

[0049] (2) Put 0.15 g of the prepared carbon material and 0.2 g of sublimed sulfur into an agate ball mill jar, control the rotational speed of the planetary ball mill to 500 r / min, ...

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Abstract

The invention discloses a core-shell structured carbon / sulfur composite positive electrode material and a preparation method therefor. The material is prepared from a shell and an inner core in a compounding manner; a gap exists between the inner core and the shell; the preparation method comprises the steps of 1) taking a surfactant as a template agent, taking ethyl orthosilicate as a pore-forming agent, taking phenolic resin as a carbon source, and obtaining a core-shell structured polymer through a ''stober'' method; 2) cooling, centrifuging and drying the obtained product, and then performing high temperature calcining and carbonizing on the processed product to obtain a core-shell structured carbon material; 3) etching the material by an etching agent and then washing and drying the material to obtain the core-shell structured carbon material with a porous shell wall; and 4) grinding and uniformly mixing sulfur with the material, and putting the mixture to an ampoule bottle, and performing vacuum heating, fusing and pouring in a tubular furnace to obtain the S-C composite material. The method has a simple process and uses cheap raw materials; and meanwhile, the shell wall of the core-shell structured carbon material has a rich hole-channel structure, so that loss of active ingredients can be effectively restrained, the stability of the electrode material can be improved, and the electrochemical performance is improved.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a lithium-sulfur battery composite cathode material, in particular to a core-shell structure carbon / sulfur composite cathode material with a porous shell wall, a preparation method thereof, and an application thereof in a lithium-sulfur battery. Background technique [0002] Lithium-ion battery is currently the most commonly used secondary battery system. Since 1990, it has dominated the portable mobile device market for more than 20 years. However, the lithium-ion battery is close to its theoretical capacity, and there is almost no room for improvement. It has been unable to meet the needs of large-capacity, long-life secondary batteries such as electric vehicles and large electronic equipment. The theoretical specific capacity of elemental sulfur is 1675mAh / g, and when assembled with metal lithium to form a battery, the theoretical mass specific energy can reach 2500Wh / kg. Elemen...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M10/052Y02E60/10
Inventor 张凤祥杜新宇张小龙李令东
Owner DALIAN UNIV OF TECH
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