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Method for preparing three-dimensional porous microsphere defined by nitrogen/sulfur co-doped carbon nanosheet with embedded metal/carbon yolk shell structure

A carbon nanosheet, three-dimensional porous technology, applied in the direction of structural parts, active material electrodes, electrical components, etc., can solve the problems of restricting industrial application, complicated process, and retention, so as to promote practical application, good controllability, and cost saving Effect

Active Publication Date: 2019-09-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the development and application of negative electrode materials mostly stay in the basic research stage, due to the low output of the preparation process (hydrothermal, solvothermal and electrospinning, etc.), the process is complicated and expensive, making it difficult to industrialize production
Another key problem is that it is difficult for the products obtained by many preparation schemes to have stable cycle performance under high current when used as the negative electrode of lithium / sodium ion batteries, which greatly limits the possibility of industrial application.

Method used

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  • Method for preparing three-dimensional porous microsphere defined by nitrogen/sulfur co-doped carbon nanosheet with embedded metal/carbon yolk shell structure
  • Method for preparing three-dimensional porous microsphere defined by nitrogen/sulfur co-doped carbon nanosheet with embedded metal/carbon yolk shell structure
  • Method for preparing three-dimensional porous microsphere defined by nitrogen/sulfur co-doped carbon nanosheet with embedded metal/carbon yolk shell structure

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Experimental program
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Effect test

Embodiment 1

[0029] According to Sb 3+ :C and C:Na + The ratio of the amount of substance is 1:15 and 28:100, the 0.95g (CH 3 COO) 3 Sb, 1.94 g of C 6 h 5 o 7 (NH 4 ) 3 and 10g of NaCl were dissolved in 80mL of deionized water, stirred at room temperature for 9h to ensure that C 6 h5 o 7 (NH 4 ) 3 Fully complexed with metal salts. The obtained homogeneous solution was spray-dried by a spray dryer, and the inlet and outlet air temperatures of the spray dryer were 175°C and 90°C, respectively. In the process, by (CH 3 COO) 3 Sb, C 6 h 5 o 7 (NH 4 ) 3 Self-assemble with NaCl to form a hollow sphere, and the size of the sphere is normally distributed. Due to the rapid volatilization of water on the surface of the droplet at high temperature, the water inside the droplet carries NaCl and migrates to the surface, leading to its self-assembly in a very short time to form a hollow spherical precursor NaCl@(CH 3 COOH) 3 Sb-C 6 h 5 o 7 (NH 4 ) 3 . The precursor is placed i...

Embodiment 2

[0031] According to Sb 3+ :C and C:Na + The ratio of the amount of substance is 1:15 and 28:100, the 4.3g (CH 3 COO) 3 Sb, 8.74 g of C 6 h 5 o 7 (NH 4 ) 3 and 45g of NaCl were dissolved in 355mL of deionized water, stirred at room temperature for 6h to ensure that C 6 h 5 o 7 (NH 4 ) 3 Fully complexed with metal salts. The obtained homogeneous solution was spray-dried by a spray dryer, and the inlet and outlet air temperatures of the spray dryer were respectively 180°C and 90°C. Place the precursor in the middle of the tube furnace, and place the excess thiourea in the upstream. First pass argon to remove the air, then raise the temperature to 280°C at 1°C / min, keep it for 100min; then raise the temperature to 450°C at 5°C / min , and then replaced with 15% hydrogen-argon mixed gas for 2 hours; then replaced the carrier gas with pure argon, then raised the temperature to 600 ℃ at 5 ℃ / min, kept it for 2 hours and then cooled to room temperature to obtain the calcined...

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Abstract

The invention provides a method for preparing a three-dimensional porous microsphere defined by a nitrogen / sulfur co-doped carbon nanosheet with an embedded metal / carbon yolk shell structure. The method comprises the following steps of preparing a precursor: mixing antimony acetate, ammonium citrate and sodium chloride, dissolving the mixture in deionized water, spraying the obtained homogeneous mixed solution into balls by a spray dryer so as to prepare the precursor; and preparing the three-dimensional porous microsphere composite material defined by the nitrogen / sulfur co-doped carbon nanosheet with an embedded antimony / carbon yolk shell structure: putting the precursor prepared in the step 1 in the midstream of a tube furnace, putting thiourea upstream, and obtaining the three-dimensional porous microsphere composite material defined by the nitrogen / sulfur co-doped carbon nanosheet with an embedded antimony / carbon yolk shell structure in multiple steps in one pot. The prepared three-dimensional porous microsphere composite material defined by the nitrogen / sulfur co-doped carbon nanosheet with embedded antimony / carbon yolk shell structure is used as the negative electrode of a sodium ion battery.

Description

technical field [0001] The invention relates to a method for preparing three-dimensional porous microspheres surrounded by nitrogen / sulfur co-doped carbon nanosheets with embedded metal / carbon egg yolk shell structure by spray drying method, and can exhibit super The invention has high performance and belongs to the fields of nanocomposite material preparation technology and battery application technology. Background technique [0002] With people's high attention to the utilization of renewable energy, the development and application of lithium / sodium ion batteries is imminent. At present, the preparation process of lithium / sodium ion battery cathode materials is becoming more and more perfect, and the performance basically meets the needs of industrialization. However, the development and application of negative electrode materials mostly stays in the basic research stage, and due to the low output of the preparation process (hydrothermal, solvothermal and electrospinning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/054H01M4/02
CPCH01M4/362H01M4/583H01M4/38H01M10/054H01M2004/027H01M2004/021Y02E60/10
Inventor 何春年陈伯超赵乃勤师春生刘恩佐马丽颖何芳
Owner TIANJIN UNIV