Microporous ultra-thin soft carbon nanosheet, and preparation method and application thereof

A technology of nanosheets and soft carbon, which is applied in the field of nanomaterials and electrochemistry, can solve the problems of large number of SEI, decreased Coulombic efficiency, and increased irreversible capacity of electrode materials, and achieve enhanced diffusion performance, increased capacity contribution, and good cycle performance. Effect

Active Publication Date: 2019-03-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large amount of unstable SEI formed by nanomaterials, the irreversible capacity of the electrode material increases and the Coulombic efficiency decreases.

Method used

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  • Microporous ultra-thin soft carbon nanosheet, and preparation method and application thereof
  • Microporous ultra-thin soft carbon nanosheet, and preparation method and application thereof
  • Microporous ultra-thin soft carbon nanosheet, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method for microporous ultrathin soft carbon nanosheets, which comprises the steps of:

[0036] 1) First, take a certain amount of 3,4,9,10-tetracarboxylic anhydride (PTCDA) in a flowing argon atmosphere at 5°C min -1 Heat up to 900°C for sintering for 10 hours;

[0037] 2) Take 1 g of the soft carbon sample obtained in step 1) and disperse it in 100 ml of water, add 5 g of polyvinylpyrrolidone (PVP), and ultrasonically treat the mixed solution for 12 hours to uniformly disperse;

[0038] 3) Dissolve 5 g of KOH into the solution obtained in step 2), and further stir for 2 h under the condition of a water bath at 60° C. After the stirring is completed, microwave the solution for 5 min under a microwave power of 300 W;

[0039] 4) Wash the obtained solid powder with 1M HCl to remove the remaining KOH, continue washing with water and then dry it in an oven at 70°C in an air atmosphere;

[0040] 5) Under flowing argon atmosphere, at 5°C min -1 The temperatu...

Embodiment 2

[0051] 1) First, take a certain amount of 3,4,9,10-tetracarboxylic anhydride (PTCDA) in a flowing argon atmosphere at 5°C min -1 Heat up to 800°C for sintering for 10h;

[0052] 2) Take 0.5 g of the soft carbon sample obtained in step 1) and disperse it in 100 ml of water, add 5 g of polyvinylpyrrolidone (PVP), and ultrasonically treat the mixed solution for 12 hours to uniformly disperse;

[0053] 3) Dissolve 5 g of KOH into the solution obtained in step 2), and further stir for 2 h under the condition of a water bath at 60° C. After the stirring is completed, microwave the solution for 5 min under a microwave power of 300 W;

[0054] 4) Wash the obtained solid powder with 1M HCl to remove the remaining KOH, continue washing with water and then dry it in an oven at 70°C in an air atmosphere;

[0055] 5) Under flowing argon atmosphere, at 5°C min -1 The temperature was raised from room temperature to 800° C. and kept for 2 hours to finally obtain a microporous ultrathin soft...

Embodiment 3

[0058] 1) First, take a certain amount of 3,4,9,10-tetracarboxylic anhydride (PTCDA) in a flowing argon atmosphere at 5°C min -1 Heat up to 900°C for sintering for 10 hours;

[0059] 2) Take 2 g of the soft carbon sample obtained in step 1) and disperse it in 150 ml of water, add 15 g of polyvinylpyrrolidone (PVP), and ultrasonically treat the mixed solution for 12 hours to uniformly disperse;

[0060] 3) Dissolve 5 g of KOH into the solution obtained in step 2), and further stir for 2 h under the condition of a water bath at 60° C. After the stirring is completed, microwave the solution for 5 min under a microwave power of 100 W;

[0061] 4) Wash the obtained solid powder with 1M HCl to remove the remaining KOH, and dry it in an oven at 70° C. in an air atmosphere;

[0062] 5) Under flowing argon atmosphere, at 5°C min -1 Raise the temperature from room temperature to 800°C and keep it warm for 1.5 hours to finally obtain the microporous ultrathin soft carbon nanosheet elec...

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Abstract

The invention relates to a microporous ultra-thin soft carbon nanosheet electrode material, and a preparation method and an application thereof. The thickness of the microporous ultra-thin soft carbonnanosheet electrode material is 20-30nm, and the morphology is a nanosheet having a uniform size; the microporous ultra-thin soft carbon nanosheet electrode material has a surface with a pleated structure; and the microporous ultra-thin soft carbon nanosheet electrode material has a large number of micropores and defect sites at the edge of a crystal lattice to provide additional ion storage sites. The microporous ultra-thin soft carbon nanosheet electrode material provided by the invention has the beneficial effects that the microporous ultra-thin soft carbon nanosheet electrode material hasa larger specific surface area and a large number of microporous structures than the conventional soft carbon electrode material, thereby and not only enhancing the diffusion performance of ions in amaterial body, but also increasing active interfaces between the material and the electrolyte, enhancing the kinetics of the material in an electrochemical reaction process, improving the capacitivecapacity contribution, exhibiting excellent rate performance and and achieving rapid charge and discharge.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to a microporous ultrathin soft carbon nanosheet electrode material and a preparation method and application thereof. Background technique [0002] Today, lithium-ion batteries are widely used in the field of electrochemical energy storage devices due to their excellent performance, but the limited and high cost of lithium resources cannot meet the growing demand for large-scale energy storage. Sodium ions and potassium ions, as raw materials with similar electrochemical properties to lithium ions, more abundant reserves and cheaper prices, are expected to replace lithium ions in future electrochemical energy storage applications and thus receive widespread attention. However, due to its large ionic radius and large volume change during intercalation and deintercalation, the energy density and cycle stability of the battery cannot fully meet th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/054C01B32/15B82Y30/00
CPCB82Y30/00C01B32/15H01M4/587H01M10/054H01M2004/021H01M2004/027Y02E60/10
Inventor 麦立强姚旭辉柯雅洁
Owner WUHAN UNIV OF TECH
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