Amino functional carbon-sulfur composite material of porous structure and preparation method and application of material

A technology of amino functionalization and porous structure, which is applied in the direction of structural parts, non-aqueous electrolyte battery electrodes, electrical components, etc., and can solve the problems of low electrode charging performance rate performance, lithium metal negative electrode corrosion and passivation, and positive electrode structure stability reduction, etc. problems, to achieve uniform distribution of pore structure, good reproducibility, and reduce the effect of dissolution

Active Publication Date: 2016-11-23
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Application Information

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Problems solved by technology

[0003] However, in order to realize the commercial application of lithium-sulfur batteries, several key problems of sulfur materials need to be overcome: (1) the decrease in the structural stability of the positive electrode caused by the volume change of the charge-discharge products; (2) the reduction of sulfur and the reduction product (Li 2 S and Li 2 S 2 ) low electrode charging performance and limited rate performance caused by the insulating properties; (3) the "shuttle effect" of soluble polysulfide anions leads to the corrosion and passivation of the lithium metal anode, the rapid decay of battery capacity and Decrease in cycle performance
Although the surface chemical modification of carbon materials by element doping can prepare novel carbon-sulfur composite materials (carbon-sulfur composite materials with nitrogen-doped porous carbon nanofiber network structure and its preparation method and application, Chinese Patent Publication No. CN103700818A ), but currently the main doping modified graphene material or nano-carbon material makes the modification cost relatively high, which is not conducive to large-scale commercial application

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  • Amino functional carbon-sulfur composite material of porous structure and preparation method and application of material
  • Amino functional carbon-sulfur composite material of porous structure and preparation method and application of material
  • Amino functional carbon-sulfur composite material of porous structure and preparation method and application of material

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Embodiment 1

[0034] 1. The synthesis steps of the amino-functionalized porous carbon material precursor are as follows: a polyimide waste (PI) is processed into a sheet, and placed in a tube furnace, and heated at 2 °C in an air atmosphere. / min raised to 500°C and maintained for 0.5h, cooled to room temperature to obtain the pre-oxidized product. Then the obtained preoxidized product and potassium hydroxide were dispersed into 6ml of water at a ratio of 1:4, soaked at room temperature for 2 hours, then transferred to a drying oven, and evaporated to dryness at 100°C. Then transfer the product to a porcelain boat, raise it to 800°C at 5°C / min under a nitrogen atmosphere and keep it for 1h, after cooling to room temperature, wash with water, pickle, and wash with water to obtain a carbon material precursor with a porous structure containing amino functional groups Body (PI-AC), the structure and morphology are as follows figure 1 shown. Its infrared spectrum is as image 3 shown.

[003...

Embodiment 2

[0039] 1. The synthesis steps of the amino-functionalized porous carbon material precursor are as follows: a polyimide waste (PI) is processed into a sheet, and placed in a tube furnace, and heated at 2 °C in an air atmosphere. / min raised to 500°C and maintained for 0.5h, cooled to room temperature to obtain the pre-oxidized product. Then the obtained preoxidized product and potassium hydroxide were dispersed in 8ml of water at a ratio of 1:5, soaked at room temperature for 2h, then transferred to a drying oven, and evaporated to dryness at 100°C. Then transfer the product to a porcelain boat, raise it to 800°C at 5°C / min in a nitrogen atmosphere and keep it for 2h, after cooling to room temperature, wash with water, pickle, and wash with water to obtain a carbon material precursor with a porous structure containing amino functional groups Body 2.

[0040] 2. The synthesis of carbon-sulfur composite material (PI-AC / S) with amino-functionalized porous structure, the specific ...

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Abstract

The invention belongs to the technical field of carbon-sulfur batteries and particularly relates to an amino functional carbon-sulfur composite material of a porous structure and a preparation method and application of the material. Polyimide serves as the raw material, is pre-oxidized and then synthesized into an amino-containing carbon material precursor of the porous structure by means of a pore forming agent at the nitrogen atmosphere through high-temperature carbonization, the precursor and elemental sulfur are subjected to heat treatment, and the carbon-sulfur composite material is obtained. The process is simple, reproducibility is good, and the prepared composite material has a rich pore structure and can be used for the positive pole of a carbon-sulfur battery. Amino groups in the composite material can enhance constraint to polysulfide anions, dissolution and migration of the polysulfide anions in electrolyte are reduced, electric chemical performance of the positive pole material of the carbon-sulfur battery is improved, and specific discharge capacity, rate capability and cycle performance are good.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to an amino functionalized carbon-sulfur composite material with a porous structure and a preparation method and application thereof. Background technique [0002] New energy is one of the strategic emerging industries that my country has accelerated its cultivation and development. In new energy, although the application field of lithium-ion batteries has expanded from portable electronic devices to electric vehicles, power storage devices, etc., the low actual energy density of lithium-ion batteries limits its use in high-volume energy-density storage devices and Applications on large energy storage systems. In addition, the development of electric vehicles and space technology also has a wide demand for batteries with high energy density. However, the low-capacity characteristics of existing lithium-ion battery cathode materials can no longer meet t...

Claims

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Application Information

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IPC IPC(8): H01M4/137H01M4/1399H01M4/133H01M4/1393H01M4/13H01M4/139
CPCY02E60/10
Inventor 金永成朱绍银王延青姜继成
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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