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Preparation method of asphalt-based carbon microsphere and application of asphalt-based carbon microsphere as sodium ion battery electrode material

A sodium-ion battery, carbon microsphere technology, applied in battery electrodes, carbon preparation/purification, negative electrodes, etc., can solve problems such as gaps

Active Publication Date: 2019-11-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the application of MCMB in the field of lithium batteries, these results have a large gap in terms of reversible capacity, cycle stability and rate performance.

Method used

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  • Preparation method of asphalt-based carbon microsphere and application of asphalt-based carbon microsphere as sodium ion battery electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The raw material coal tar pitch was crushed, sieved, 10 g was added to 200 ml of high temperature resistant silicone oil, and 1 g of sodium dodecylbenzene sulfonate was added at the same time. At a stirring rate of 100 r / min, the system was heated up to 240° C. and kept for 2 hours. This process was always carried out in an air atmosphere. After the heat preservation is over, the pellets are separated from the silicone oil and washed. Put the product into a high-temperature carbonization furnace and heat it to 1200°C in a nitrogen atmosphere to obtain the final product.

[0022] as attached figure 1 The morphology of pitch-based carbon microspheres shown by scanning electron microscopy (SEM) remained intact.

[0023] The electrode material at 0.05mA g -1 The discharge specific capacity under the current density can reach 265mA h g -1 ; at 1A g -1 The discharge specific capacity can still be maintained at 142mA h g at a high current density -1 .

Embodiment 2

[0025] The raw material petroleum asphalt was crushed, sieved, 10 g was added to 200 ml of high temperature resistant silicone oil, and 1 g of sodium dodecylbenzene sulfonate was added at the same time. At a stirring rate of 100 r / min, the system was heated up to 240° C. and kept for 2 hours. This process was always carried out in an air atmosphere. After the heat preservation is over, the pellets are separated from the silicone oil and washed. Put the product into a high-temperature carbonization furnace and heat it to 1200°C in a nitrogen atmosphere to obtain the final product.

[0026] Electrochemical performance test results show that the electrode material is -1 The discharge specific capacity under the current density can reach 312mA h g -1 ; at 1A g -1 The discharge specific capacity can still be maintained at 184mA h g at a high current density -1 .

Embodiment 3

[0028] Crush the raw coal tar pitch, sieve it, take 10g and add it to 200ml of high temperature resistant silicone oil, and add 1g of Span 80 at the same time. At a stirring rate of 100 r / min, the system was heated up to 240° C. and kept for 2 hours. This process was always carried out in an air atmosphere. After the heat preservation is over, the pellets are separated from the silicone oil and washed. Put the product into a high-temperature carbonization furnace and heat it to 1200°C in a nitrogen atmosphere to obtain the final product.

[0029] Electrochemical performance test results show that the electrode material is -1 The discharge specific capacity under the current density can reach 271mA h g -1 ; at 1A g -1 The discharge specific capacity can still be maintained at 144mA h g at a high current density -1 .

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Abstract

The invention discloses a preparation method of an asphalt-based carbon microsphere and an application of the asphalt-based carbon microsphere as a sodium ion battery electrode material, and relates to the field of sodium ion battery electrode materials. The preparation method comprises the following steps: mixing asphalt powder and a surfactant, then adding the mixture into high-temperature silicone oil, carrying out heating and keeping the temperature in an air atmosphere, simultaneously melting the mixture into spheres and carrying out surface oxidation to obtain asphalt microspheres with regular appearance and a non-melting property, then separating the asphalt microspheres from an emulsion system, washing and drying the asphalt microspheres, and finally carbonizing the asphalt microspheres at 800-1600 DEG C to obtain a final product. The electrode material shows a discharge specific capacity of 250-450 mAh*g<-1> at a current density of 50 mA*g<-1>, still has a capacity of 140-250mAh*g<-1> after circulation for 100 cycles at a current density of 1 A*g<-1>, and has a high discharge specific capacity and good cycle stability.

Description

technical field [0001] The invention relates to the field of electrode materials for sodium ion batteries, in particular to a preparation method of pitch-based carbon microspheres and their application as electrode materials for sodium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in the field of energy storage due to their high energy density and good cycle stability. However, due to the low reserves and uneven distribution of lithium resources, the further development of lithium-ion batteries is limited. The reserve of sodium element is very abundant, and it belongs to the same main group as lithium, and has similar electrochemical properties, so the research and application of sodium ion batteries have very broad prospects. [0003] At present, there have been many studies on the positive electrode materials of sodium ion batteries, but the negative electrode materials are often the key factors that determine the performance of ...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01M4/583H01M10/054
CPCC01B32/05H01M4/583H01M10/054H01M2004/027Y02E60/10
Inventor 宋怀河袁满陈晓红
Owner BEIJING UNIV OF CHEM TECH
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