Biological carbon electrode material and preparation method thereof

An electrode material, bio-carbon technology, applied in carbon preparation/purification, battery electrodes, circuits, etc., can solve problems such as low utilization rate, achieve the effect of low cost, less purity, and ensure cycle stability

Inactive Publication Date: 2017-05-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Rapeseed husk is a by-product of the production of crop rapeseed. It is rich in resources. Rapeseed husk has an excellent natural structure. Through analysis of its compo

Method used

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  • Biological carbon electrode material and preparation method thereof
  • Biological carbon electrode material and preparation method thereof
  • Biological carbon electrode material and preparation method thereof

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preparation example Construction

[0031] In the present invention, rapeseed stalks, corn stalks, rice husks, rapeseed husks, wheat straws or cotton stalks are used as plant stalks; the treatment methods are the same, and the rapeseed husks are used as an example to illustrate the present invention. The preparation method comprises the following steps:

[0032] First, mix every 3g of washed, dried and shredded rapeseed shells with 20-50mL of water; ball mill for 1-2h at a rotating speed of 300-500r / min, and after drying, the mass ratio of the activator to the crushed rapeseed shells is ( 0.5~3): 1 add activator, the activator can be KOH, NaOH, ZnCl 2 , K 2 CO 3 , any one of MgO; transferred to the atmosphere furnace, under the protection of the atmosphere, the temperature is raised to the set temperature at a heating rate of 1-10°C / min, such as 500-1100°C for 2-6h; the protective gas is nitrogen, Any one of argon, helium, neon or a mixed gas of two or more, the gas flow rate is 20sccm~100sccm; then add it to...

Embodiment 1

[0034] Mix 3g of washed, dried and shredded rape shells with 20ml of water; ball mill for 2h at a rotating speed of 300r / min, mix KOH and rape shells in a ratio of 1 after drying, transfer to an atmosphere furnace, and heat in an argon atmosphere (50sccm) Under protection, the temperature was raised to 800°C for 2 hours; then magnetically stirred with 3mol / L hydrochloric acid at room temperature for 12 hours; finally, washed with deionized water and ethanol for 3 times, and vacuum-dried for 12 hours to obtain a network structure biocarbon electrode material.

[0035] From figure 1 It can be seen that the prepared carbon material has a three-dimensional network structure;

[0036] It can be seen from Figure 2(a) that the prepared carbon material has a large specific surface area of ​​673.5m 2 g -1 ; As can be seen from Figure 2 (b), the pore size distribution is at 30-50nm;

[0037] The sodium ion battery assembled with the carbon electrode material has excellent electrochem...

Embodiment 2

[0039] Mix 3g of washed, dried and shredded rapeseed shells with 30ml of water; ball mill for 2h at a rotating speed of 500r / min, mix the dried KOH and rapeseed shells in a ratio of 3, transfer them to an atmosphere furnace, and heat them in a neon gas atmosphere (100sccm) Under protection, the temperature was raised to 1000°C for 2 hours; then magnetically stirred with 3mol / L hydrochloric acid at room temperature for 12 hours; finally, washed with deionized water and ethanol for 3 times, and vacuum-dried for 24 hours to obtain a network structure biocarbon electrode material.

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Abstract

The invention relates to a biological carbon electrode material and a preparation method thereof. The preparation method comprises mixing plant straws and water, carrying out ball milling to obtain plant straw powder, wherein a ratio of the plant straws to water is 3 g: (20 to 50) mL, adding an activator into the plant straw powder subjected to ball milling, heating the mixture in protective gas to a temperature of 500-1100 DEG C, carrying out thermal insulation for 2-6h, and treating the product to obtain the biological carbon electrode material. The biological carbon electrode material is prepared from renewable agricultural by-product plant straws, and through ball milling and activator carbonization, the three-dimensional network structure carbon material having a certain graphitization degree is obtained. The three-dimensional network structure carbon material has a three-dimensional network structure and good ion intercalation and diffusion properties, shortens ion intercalation and detachment distances and guarantees cycling stability of a sodium ion battery.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of electrode material preparation, and in particular relates to a biological carbon electrode material and a preparation method thereof. [0003] 【Background technique】 [0004] Batteries, also known as electrochemical cells, store chemical energy as electrical energy or generate electric current due to electrochemical reactions. The main types of batteries can be divided into two types, including primary cells and secondary cells. When a primary battery stores chemical energy, it cannot be used again until the battery is fully discharged. For the storage battery, the potential when the current works is higher than the battery potential, and a reversible oxidation-reduction reaction occurs at this time, and the storage battery can be charged and discharged many times. Nowadays, people's life is increasingly inseparable from batteries, such as laptop computers, mobile communications, electric vehicl...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01M4/587H01M10/054
CPCC01P2004/03C01P2006/16C01P2006/17C01P2006/40H01M4/587H01M10/054Y02E60/10
Inventor 曹丽云惠文乐许占位黄剑锋王欣李嘉胤欧阳海波费杰
Owner SHAANXI UNIV OF SCI & TECH
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