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Alkynyl carbon material, preparation method thereof and composite electrode

A composite electrode and carbon material technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of increased synthesis cost of alkyne-based carbon materials, low yield and purity of alkyne-based carbon, and complicated reaction process. Achieve the effects of improved purity, simple process, and mild operating conditions

Pending Publication Date: 2021-11-16
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the existing technologies prepare alkynyl carbon materials through the cross-coupling reaction of hexaalkynylbenzene. The reaction process is complicated, the coupling efficiency is low, the reaction system will produce more by-products, and the bulk polymerization of monomers will occur. , leading to a substantial increase in the synthesis cost of alkynyl carbon materials, and the yield and purity of the synthesized alkynyl carbon are low

Method used

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  • Alkynyl carbon material, preparation method thereof and composite electrode
  • Alkynyl carbon material, preparation method thereof and composite electrode
  • Alkynyl carbon material, preparation method thereof and composite electrode

Examples

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Embodiment 1

[0040] 1) Calcium carbide and hexabromobenzene after vacuum drying are mixed in a molar ratio of 5:1, the mass ratio of stainless steel grinding balls to the total mass of calcium carbide and hexabromobenzene is 10:1, grinding balls of different diameters (5mm, 8mm, 10mm, 12mm, 15mm) ratio 5:4:3:2:1, mix and seal the ball milling tank in a glove box filled with argon atmosphere protection;

[0041] 2) Using a planetary ball mill to mill for 24 hours at a rate of 1000r / min, pass through a 140-mesh sieve to obtain a mixed product;

[0042] 3) Wash the screened sample with 0.5mol / L dilute nitric acid solution several times until the eluate is neutral, then filter and dry, weigh 3g of the sample and place it in a porcelain boat in a nitrogen atmosphere. In a protected tube furnace, the temperature was raised to 300° C. for 5 hours at a heating rate of 2° C. / min for calcination, and naturally cooled to room temperature to obtain an alkyne-based carbon material.

Embodiment 2

[0044] The ratio of grinding balls with different diameters (5, 8, 10, 12, 15 mm) is 2:1:3:5:4, and the rest are the same as in Example 1.

Embodiment 3

[0046] The ratio of grinding balls with different diameters (5, 8, 10, 12, 15 mm) is 1:3:5:2:4, and the rest are the same as in Example 1.

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Abstract

The invention provides an alkynyl carbon material, a preparation method thereof and a composite electrode, and the preparation method comprises the following steps: mixing calcium carbide, hexa-halobenzene and ball milling beads according to a mass ratio of the ball milling beads to the total mass of the calcium carbide and the hexa-halobenzene being (10-150): 1, and carrying out ball milling at 400-1000r / min for 24-48h to obtain mixed powder; and seiving the mixed powder, carrying out post-treatment, and obtaining the alkynyl carbon material. According to the preparation method of the alkynyl carbon material, the calcium carbide and the hexahalobenzene are induced to be subjected to a multi-phase chemical reaction through mechanical energy generated through mechanical ball milling and heat induction, the high-purity alkynyl carbon material is obtained through post-treatment, and the prepared alkynyl carbon material is high in purity and yield; and the alkynyl carbon material has high conductivity, nanoscale pores and interlayer spacing suitable for metal ion conduction, and is beneficial to lithium ion transmission and buffering of volume strain in the electrochemical reaction process.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to an alkyne-based carbon material, a preparation method thereof, and a composite electrode. Background technique [0002] As one of the most promising next-generation secondary batteries, lithium-sulfur batteries have been extensively studied due to their high theoretical specific capacity of 1675mAh / g, energy density of 2600Wh / kg, environmental friendliness and abundant sulfur reserves. However, due to the electronic insulation (10-30S / cm) of elemental sulfur and the volumetric strain during discharge, the sulfur cathode usually needs to be composited with a conductive matrix material, and carbon materials are considered to be the preferred carrier for the composite. Among them, the alkyne-based carbon material represented by graphyne is characterized by its unique nano-scale pores, two-dimensional layered conjugated skeleton structure and semiconductor pr...

Claims

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Application Information

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IPC IPC(8): C01B32/15H01M4/13H01M4/139H01M4/38H01M4/62H01M10/052
CPCC01B32/15H01M4/625H01M4/38H01M4/13H01M4/139H01M10/052Y02E60/10
Inventor 杨蓉樊潮江黄勇刘珊燕映霖
Owner XIAN UNIV OF TECH
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