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Preparation and application of an ordered crosslinked fibrous graded porous carbon material having one-dimensional orientation

A graded porous carbon and fibrous technology, which is applied in the preparation/purification of carbon, electrical components, battery electrodes, etc. problems such as low surface and pore volume, to achieve the effect of improving sulfur fixation effect, fewer synthesis steps and large pore volume

Active Publication Date: 2017-06-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the specific surface area of ​​traditional one-dimensional materials (generally less than 200m 2 g -1 ) and pore volume (generally less than 0.2cm 3 g -1 ) constraints, the synthesized materials have low specific surface area and pore volume, which seriously affects the capacity, cycle performance and sulfur filling capacity of lithium-sulfur batteries.
Moreover, in the synthesis process, a variety of templates need to be added, and the preparation can only be successful through the synergistic effect of the templates. The process is cumbersome, the operation is complicated, and it is difficult to cross-link between fibers, and it is difficult to eliminate the contact resistance between fibers.

Method used

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  • Preparation and application of an ordered crosslinked fibrous graded porous carbon material having one-dimensional orientation
  • Preparation and application of an ordered crosslinked fibrous graded porous carbon material having one-dimensional orientation
  • Preparation and application of an ordered crosslinked fibrous graded porous carbon material having one-dimensional orientation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 0.42g of trimesic acid and 0.96g of copper nitrate, stir at room temperature for 0.5h, transfer to a 100mL hydrothermal reaction kettle, and -1 The heating rate is raised to 180°C, kept at a constant temperature for 24 hours, and then at 0.3°C min -1 The cooling rate was lowered to room temperature, and the resulting blue floc was washed and then transferred to a tube furnace at 3°C ​​min -1 The heating rate is raised to 900°C, kept at a constant temperature for 4 hours, and then at 1°C min -1 cooling rate down to room temperature. The carbonized product was placed in 10wt% HNO 3 After standing for 24 hours, dried, mixed with KOH (mass ratio of KOH to carbon is 4:1), placed in a nickel tube furnace, heated at 10°C min -1 The heating rate is raised to 700°C, the temperature is maintained for 1h, and then at 2°C min -1 The cooling rate was lowered to room temperature, and the resulting product was again placed in 10wt% HNO 3 After standing for 24 hours, washing...

Embodiment 2

[0046] Weigh 0.42g of trimesic acid and 1.20g of zinc nitrate, stir at room temperature for 0.5h, transfer to a 100mL hydrothermal reaction kettle, and -1 The heating rate is raised to 180°C, kept at a constant temperature for 24 hours, and then at 0.3°C min -1 The cooling rate was lowered to room temperature, and the resulting white product was washed and transferred to a tube furnace at 3°C ​​min -1 The heating rate is raised to 950°C, kept at a constant temperature for 4 hours, and then at 1°C min -1 cooling rate down to room temperature. The obtained product was used directly without post-treatment. Subsequent sulfur filling, battery assembly test steps are the same as in Example 1.

[0047] Under the 0.5C rate, the discharge specific capacity of the first cycle is 1384mA h g -1 , after 40 cycles, the discharge specific capacity is 344mA h g at 15C rate -1 .

Embodiment 3

[0049] Weigh 0.42g of trimesic acid and 1.20g of copper nitrate, stir at room temperature for 0.5h, let it stand for 24h, wash the resulting blue product and transfer it to a tube furnace, heat at 3°C ​​min -1 The heating rate is raised to 900°C, kept at a constant temperature for 4 hours, and then at 1°C min -1 cooling rate down to room temperature. Subsequent activation, sulfur filling, battery assembly test steps are the same as in Example 1. .

[0050] Under the 0.5C rate, the discharge specific capacity of the first cycle is 1365mA h g -1 , after 40 cycles, the discharge specific capacity is 325mA h g at 15C rate -1 .

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Abstract

The invention relates to preparation and application of an oriented ordered crosslinked fibrous graded porous carbon material having one-dimensional orientation. A metal salt and an organic ligand are adopted as raw materials to prepare a metal organic frame (MOF) having one-dimensional orientation. The ordered crosslinked fibrous graded porous carbon material having one-dimensional orientation is prepared through programmed heating and carbonization, template etching and activation. The organic ligand is one or two or above selected from a group consisting of trimesic acid, melamine, cyanuric acid and thiocyanuric acid. The metal salt is one or two or above selected from a group consisting of ferric nitrate, copper nitrate, nickel nitrate and zinc nitrate. The porous carbon material is adopted as a cathode material of a lithium sulfur cell, has huge advantages in the fields of material preparing processes, electron and ionic conduction, and the like and has a good application prospect.

Description

technical field [0001] The invention relates to a one-dimensionally oriented ordered cross-linked fibrous hierarchical porous carbon material for a lithium-sulfur battery. Background technique [0002] Among commercialized secondary batteries, lithium-ion batteries are currently the secondary batteries with the highest energy density, but the theoretical specific capacity of lithium-ion batteries based on the "deintercalation" theory is currently less than 300mA h g -1 , the actual energy density is less than 200Wh kg -1 , It is far from meeting people's demand for 500km battery life of electric vehicles. Lithium-sulfur battery, as a new electrochemical energy storage secondary battery, is different from the traditional lithium ion "deintercalation" material. During the discharge process, sulfur and metal lithium undergo a two-electron reaction, which can release a high specific capacity. (1675mAh g -1 ), the theoretical specific energy is also as high as 2600Wh kg -1 , ...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01M4/583H01M4/587H01M10/052
CPCC01P2004/03C01P2004/04C01P2006/12C01P2006/14C01P2006/16C01P2006/17C01P2006/40H01M4/583H01M4/587H01M10/052Y02E60/10
Inventor 张华民杨晓飞张洪章李先锋王美日晏娜周伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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