C-axis pore-forming graphite as well as preparation method and application thereof

A graphite and hole-making technology, applied in the direction of graphite, structural parts, electrical components, etc., can solve the problem that graphene cannot be kept well

Active Publication Date: 2022-05-13
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene cannot maintain a good crystalline structure. Graphite is used as a capacity platform for ion intercalation e...

Method used

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  • C-axis pore-forming graphite as well as preparation method and application thereof
  • C-axis pore-forming graphite as well as preparation method and application thereof
  • C-axis pore-forming graphite as well as preparation method and application thereof

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preparation example Construction

[0026] Preparation of graphite embedded with compound particles

[0027] Fix the graphite block or graphite powder compact on the molybdenum rod collector as the working electrode, the graphite rod as the counter electrode, the Ag / AgCl electrode as the reference electrode, and the chloride molten salt at 400°C to 1000°C as the electrolyte. An electrode potential of -0.9-2.0V (vs.Ag / AgCl) is applied to the electrode for cathodic polarization, and the polarization time is 0.5-4h. The cathodic polarization product is taken out, cooled and washed with water to obtain an embedded graphite-based composite material embedded with 3-30 wt% compound particles, that is, graphite embedded with compound particles.

Embodiment 1

[0029] Graphite embedded with 6 wt% LiCl particles was heated in air atmosphere at 350 °C and 450 °C for 2 h, respectively. Cool to room temperature, take out the sample, wash with water or dilute hydrochloric acid, and dry to obtain the porosity of the C-axis pore-forming graphite is about 5% and 60%, respectively.

Embodiment 2

[0031] Graphite embedded with 6 wt% LiCl particles was heated at 400 °C in an air atmosphere for 10 h. Cool to room temperature, take out the sample, wash with water or dilute hydrochloric acid, and dry to obtain a C-axis pore-forming graphite with a porosity of about 70%. It shows that the pore size on the C-axis pore-forming graphite plane layer prepared under this condition is between 50-150nm, and the plane diffusion range of the basic graphite layer structure unit is between 10-200nm. The thickness of the basic graphite unit in the C-axis direction is greater than 20 nm.

[0032] Mix the planar pore-forming graphite with acetylene black and polyvinylidene fluoride in a mass ratio of 80:10:10, adjust it into a slurry, and evenly coat it on copper foil (99.99%) to make a working electrode. The sheet is the counter electrode, the polypropylene microporous membrane is the separator, 1M LiPF6 (EC-DEC=1:1vol%+10%FEC) was used as the electrolyte, and the button battery was asse...

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Abstract

The invention relates to C-axis pore-forming graphite, an apparent particle structure of the C-axis pore-forming graphite is formed by basic layered structure units, the basic layered structure units have pores in the C-axis direction, and the C-axis pore-forming graphite is used as an embedded electrode active material and has high rate performance.

Description

technical field [0001] The invention relates to a C-axis pore-forming graphite and a preparation method and application thereof, belonging to the field of energy materials and manufacturing. Background technique [0002] Graphite is a layered structure material, the carbon atoms in the same layer are sp 2 Hybridization forms relatively strong covalent bonds, and the layers are combined by van der Waals force. Graphite is an important lithium battery negative electrode material and other ion intercalation electrode active materials due to its small bonding force between layers and large interlayer spacing, which can allow lithium ions to be intercalated and extracted. In practical applications, graphite needs to maintain its intrinsic layered structure and have a relatively large micron-scale particle size, which will inevitably lead to slow diffusion kinetics of ions intercalating and deintercalating between graphite layers, so the rate performance of graphite negative elec...

Claims

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Application Information

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IPC IPC(8): C01B32/20C01B32/23H01M4/583
CPCC01B32/20C01B32/23H01M4/583Y02E60/10
Inventor 金先波王志勇张春燕
Owner WUHAN UNIV
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