Ordered nanostructure sulphur/mesoporous carbon composite material for anode of lithium ion battery

A composite material and nanostructure technology, applied in battery electrodes, electrode carriers/current collectors, structural parts, etc., can solve the problems of inability to effectively resist polysulfide dissolution, poor stability of lithium-sulfur batteries, and influence on sulfur content and dispersion, etc. problem, to achieve the effect of high sulfur content, high capacity and low cost

Inactive Publication Date: 2010-06-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common problem of these carbon materials is that the contact area between sulfur and carbon is limited, which affects the content and dispersion of sulfur, and at the same time cannot effectively resist the dissolution of polysulfides, resulting in poor stability of the assembled lithium-sulfur battery.

Method used

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  • Ordered nanostructure sulphur/mesoporous carbon composite material for anode of lithium ion battery
  • Ordered nanostructure sulphur/mesoporous carbon composite material for anode of lithium ion battery
  • Ordered nanostructure sulphur/mesoporous carbon composite material for anode of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The ordered mesoporous carbon material C-FDU-16 with a pore diameter of 5-9 nm is used as a carrier.

[0024] (1) Preparation of ordered mesoporous carbon FDU-16 by membrane plate method, please refer to Y.Meng, D.Gu, F.Q.Zhang, Y.F.Shi, H.F.Yang, Z.Li, C.Z.Yu, B.Tu, D.Y.Zhao , Angew. Chem. Int. Ed. 2005, 44, 7053-7059. The details are as follows: liquefy phenol at 50°C, take 0.58mL in a clean beaker, add 0.1mL of NaOH solution with a mass fraction of 20%, and magnetically stir for 30min; then add 1.30mL of formaldehyde with a mass fraction of 37% drop by drop Solution, then heated up to 75°C and stirred for 1 hour; dried in vacuum at 40°C-50°C for 24 hours to obtain phenolic resin; took 1.6g of surfactant F127, 1g of phenolic resin 1g0.2mol / L dilute HCl and 10mL of ethanol and continued to stir at 75°C for 2h to obtain Transfer a clear yellow solution to an evaporating dish, and use induced volatilization self-assembly to synthesize the precursor of mesopor...

Embodiment 2

[0029] Example 2: CMK-3 in the mesoporous carbon CMK-n series is used as the carrier.

[0030] (1) Using the hard template method to prepare nano-ordered mesoporous material CMK-3, see S.Jun, S.H.Joo, R.Ryoo., M.Kruk, M.Jaroniec, Z.Liu, T.Ohsuna, O. Terasaki, J. Am. Chem. Soc. 2000, 122, 10712. The specific steps are: 1. Take 1.0g of SBA-15 with a pore diameter of about 6nm as a template, 1.25g of sucrose as a carbon source, dissolve in 5.0mL of water, add 0.14g of concentrated sulfuric acid at the same time, mix ultrasonically for 1h, then heat at 100°C for 12h, then Heating at 120°C for 12 hours; step 2, impregnation again, 0.8000g sucrose, 0.0900g concentrated sulfuric acid, 5.0mL water, the heating conditions are the same as step 1; step 3, nitrogen protection, placed in a tube furnace, heating at 900°C for 6h; step 4 , 20% hydrofluoric acid or 40% mass fraction of alkali-alcohol solution was stirred at room temperature for 24 hours, the purpose of which was to remove sil...

Embodiment 3

[0033] Embodiment 3: SNU-2 in the SNU-n series is used as the carrier.

[0034] (1) Preparation of nano-ordered mesoporous carbon materials by co-synthesis method, see reference H.Q.Li, R.L Liu, D.Y.Zhao, Y.Y.Xiao, Carbon.45(2007) 2628-2635.

[0035] (2) Preparation of nano-ordered sulfur / mesoporous carbon composite material: the mass fraction of configuration sulfur is 10% carbon disulfide solution; the mesoporous carbon is placed on the Buchner funnel, the above-mentioned mixed solution is used as filtrate, and the pump is filtered with circulating water Continuous suction filtration, control time 0.5h-2h, composite materials with different sulfur content can be obtained; the obtained materials are baked in a drying oven at 50°C for 4-6h; nitrogen protection, placed in a tube furnace at 140°C 1h, finally the nano-ordered sulfur / mesoporous carbon composite material is obtained. And assembled into a lithium-sulfur battery, showing excellent electrochemical performance.

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Abstract

The invention relates to an ordered nanostructure sulphur / mesoporous carbon composite material for anode of a lithium ion battery; the composite material is formed by taking the ordered carbon-based mesoporous material as a carrier and loading nanometer sulphur in porous channels; the composite material is sulphur-mesoporous carbon composite material which has high sulphur content, good dispersibility, high capacity and good stability, thereby overcoming the disadvantages of electricity-conducting material, finding good carrier material for the lithium-sulphur batteries and opening up new application field for the mesoporous material; the method in the invention has the advantages of low preparation process and low cost.

Description

technical field [0001] The invention relates to an ordered nanostructure sulfur / mesoporous carbon composite material used for the positive electrode of lithium batteries. technical background [0002] With the rapid development of smaller, lighter and higher-performance electronic and communication devices, people have put forward higher and higher requirements on the performance of the batteries that power these devices, especially the specific energy. However, the specific capacity of currently commercialized lithium-ion batteries and MH / Ni batteries has been difficult to continue to increase. Therefore, there is an urgent need to develop batteries with higher specific energy. Lithium-sulfur battery is a secondary lithium battery known for its high energy density and high power density. The charging and discharging reaction mechanism of lithium-sulfur battery is S8+16Li-8Li 2 S, the electrode potential of the oxidation-reduction pair relative to Li / Li + It is 2.2V, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 李永徐甲强董晓雯赵宏滨朱永恒
Owner SHANGHAI UNIV
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