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Nano magnesium oxide doped biomass graded porous carbon/sulfur anode and preparation method thereof, and application of nano magnesium oxide doped biomass graded porous carbon/sulfur anode

A nano-magnesium oxide, graded porous technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of fast capacity decay and low utilization rate of active materials, achieve good dispersion, improve Electrochemical properties, effects for immobilization and efficient utilization

Inactive Publication Date: 2019-09-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the insulation of sulfur in the positive active material and the shuttle effect of lithium polysulfide during cycling, the utilization rate of the active material is low and the capacity decays quickly. Lithium-sulfur battery finds the key problem that needs to be solved urgently

Method used

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  • Nano magnesium oxide doped biomass graded porous carbon/sulfur anode and preparation method thereof, and application of nano magnesium oxide doped biomass graded porous carbon/sulfur anode
  • Nano magnesium oxide doped biomass graded porous carbon/sulfur anode and preparation method thereof, and application of nano magnesium oxide doped biomass graded porous carbon/sulfur anode

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Embodiment 1

[0037] (1) Crab shells are used as raw materials, washed, dried, and pulverized. In the nitrogen atmosphere of the tube furnace, the temperature is raised to 330°C at 5°C / min, and the temperature is kept for 2-3h for pre-carbonization.

[0038] (2) Mix the pre-carbonized material obtained in step (1) with potassium hydroxide at a mass ratio of 1:1, and in a tube furnace nitrogen atmosphere, heat up to 750°C at 5°C / min for carbonization, and keep warm for 2-3h , cooled to room temperature.

[0039] (3) The material obtained in step (2) was washed several times with 1M hydrochloric acid, washed with deionized water until neutral, dried, and pulverized by ball milling to obtain a crab shell-based hierarchical porous carbon material.

[0040] (4) Mix the prepared crab shell-based hierarchical porous carbon with magnesium acetate in an aqueous solution according to a certain ratio to form solution A. The ratio depends on the set doping amount of nano-magnesium oxide in the carbon m...

Embodiment 2

[0047] (1) Crab shells are used as raw materials, washed, dried, and pulverized. In the nitrogen atmosphere of the tube furnace, the temperature is raised to 330°C at 5°C / min, and the temperature is kept for 2-3h for pre-carbonization.

[0048] (2) Mix the pre-carbonized material obtained in step (1) with potassium hydroxide at a mass ratio of 1:1, and in a tube furnace nitrogen atmosphere, heat up to 750°C at 5°C / min for carbonization, and keep warm for 2-3h , cooled to room temperature.

[0049] (3) The material obtained in step (2) was washed several times with 1M hydrochloric acid, washed with deionized water until neutral, dried, and pulverized by ball milling to obtain a crab shell-based hierarchical porous carbon material.

[0050] (4) Mix the prepared crab shell-based hierarchical porous carbon with magnesium acetate in an aqueous solution according to a certain ratio to form solution A. The ratio depends on the set doping amount of nano-magnesium oxide in the carbon m...

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Abstract

The invention relates to a nano magnesium oxide doped biomass graded porous carbon / sulfur anode and a preparation method thereof, and application of a nano magnesium oxide doped biomass graded porouscarbon / sulfur anode. Magnesium ions are anchored by nitrogen and oxygen co-doped crab shell based graded porous carbon with a high specific surface area, magnesium hydroxide is synthesized in situ incarbon pores, and nano magnesium oxide doped crab shell based graded porous carbon with uniformly distributed nano magnesium oxide is obtained by calcination. When the nano magnesium oxide doped biomass graded porous carbon / sulfur anode is applied to a lithium-sulfur battery anode, the material can ensure the good contact of the polysulfide and a conductive structure while effectively fixing the polysulfide to achieve the balance of adsorption and reutilization of polysulfide, improve the utilization rate of active substances and effectively improve the electrochemical performance of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur battery materials, and in particular relates to a nano-magnesium oxide-doped biomass graded porous carbon / sulfur positive electrode for a lithium-sulfur battery positive electrode, a preparation method and application thereof. Background technique [0002] With the rapid development of society, people's demand for energy is increasing, but the limitation of traditional petrochemical resources and its negative impact on the environment call for the exploration and utilization of clean energy. Instability is very important for energy storage, and secondary batteries are an effective energy storage method. [0003] At the same time, the rapid development of portable electronic devices and electric vehicles calls for the development of battery systems with high specific energy and high cycle stability. Lithium-sulfur batteries have a much higher theoretical energy density than lithium-ion batteries, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/62H01M4/625H01M10/052Y02E60/10
Inventor 黄雅钦魏坤锐
Owner BEIJING UNIV OF CHEM TECH
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