A kind of porous carbon film for lithium-sulfur battery and its application

A lithium-sulfur battery and porous carbon technology, which is applied in the direction of lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of poor conductivity and reduce the proportion of effective materials in electrodes, and achieve good comprehensive performance. The preparation process is simple and mature, The effect of improving the utilization rate

Active Publication Date: 2018-08-24
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, the traditional powder carbon materials need to add a binder, and need a dense aluminum film as a support. The effective substance (C / S composite) of the electrode is of small quality. Additional carbon powder acts as a conductive agent, further reducing the proportion of active substances in the electrode

Method used

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  • A kind of porous carbon film for lithium-sulfur battery and its application
  • A kind of porous carbon film for lithium-sulfur battery and its application
  • A kind of porous carbon film for lithium-sulfur battery and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Weigh 1.0g polyacrylonitrile (PAN, Mw=150000) and 0.1g polyvinylpyrrolidone (PVP, Mw=10000), stir and dissolve in 15.4g N,N-dimethylformamide solution, add 1.0g Hydrophobic silica particles (diameter d = 20nm), after stirring for 24h, spread into a film (scraper adjustment 500μm), put it on a 70°C drying table and dry it overnight, and cut it into small discs with a diameter of 14mm (such as figure 2 (shown on the left), placed in a muffle furnace for pre-oxidation at 250°C, with a heating rate of 1°C min -1 , keep the temperature for 4 hours, after cooling to room temperature, put it in a tube furnace for carbonization at 900-1200 degrees Celsius, and the heating rate is 5℃min -1 , constant temperature for 4h, after cooling to room temperature, carbonized small discs (such as figure 2 (shown on the right) placed in 20wt% HF to etch the template for 48 hours, washed with deionized water several times and dried. The test steps of sulfur filling and assembling the bat...

Embodiment 2

[0059] Weigh 0.67g polyacrylonitrile (PAN, Mw=150000), 0.67g PMMA, and 0.1g polyvinylpyrrolidone (PVP, Mw=10000), stir and dissolve in a solution of 15.4g N,N-dimethylformamide Finally, 0.67 g of hydrophobic silica particles (diameter d=20 nm) were added, and after stirring for 24 hours, a mixed solution was obtained. Subsequent film laying, sulfur filling, and battery assembly test steps are the same as in Example 1.

[0060] The specific capacity of the first cycle discharge is 1255mA h g -1 , the capacity maintained at 984mA h g after 20 cycles -1 , The capacity retention rate was 78.4%.

Embodiment 3

[0062] Weigh 0.8g polyacrylonitrile (PAN, Mw=150000) and 0.1g polyvinylpyrrolidone (PVP, Mw=10000), stir and dissolve in 15.4g N,N-dimethylformamide solution, add 1.2g Calcium carbonate particles (diameter d=20nm), after stirring for 24 hours, a mixed solution was obtained. Subsequent film laying, sulfur filling, and battery assembly test steps are the same as in Example 1.

[0063] The specific capacity of the first cycle discharge is 1320mA h g -1 , the capacity maintained at 1088mA h g after 20 cycles -1 , The capacity retention rate was 82.4%.

[0064] Depend on figure 2 It can be seen that the morphology of this type of carbon film has no obvious change before and after carbonization, and the overall size is slightly reduced, which is caused by the volume shrinkage of the polymer during carbonization; image 3 It can be seen that Example 1 is a single mesoporous distribution, while Examples 2 and 3 are micro-mesoporous bimodal pore structure distributions. This is d...

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Abstract

The invention discloses a porous carbon membrane for lithium-sulfur batteries and its application in lithium-sulfur batteries. , or a mixture of organic polymer resin and powdered carbon material as raw materials to prepare an organic film or an organic-inorganic composite film, and a porous carbon film obtained by pre-oxidation, temperature-programmed carbonization, and etching template. As a cathode material for lithium-sulfur batteries, porous carbon membranes show unparalleled advantages in electrode preparation process, raw material utilization, conductivity, electrode composition, structure, and quality, and have good application prospects.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a porous carbon film for a lithium-sulfur battery and an application thereof. 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 300mAh g -1 , the actual energy density is less than 200Whkg -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 2600Whkg -...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01M4/583H01M4/133H01M10/052
CPCY02E60/10
Inventor 张华民杨晓飞张洪章晏娜周伟王美日
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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