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A kind of composite material, its preparation method and application in lithium ion battery

A technology of composite materials and mixed materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high cost, difficult stable production, complicated preparation process, etc., and achieve good mechanical strength, high electrical conductivity, and electrochemical performance. Good results

Active Publication Date: 2021-04-06
中科(马鞍山)新材料科创园有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its preparation process is complicated, it is difficult to produce stably, and the cost is high

Method used

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  • A kind of composite material, its preparation method and application in lithium ion battery
  • A kind of composite material, its preparation method and application in lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0055] (1) Add 0.58gNa to a beaker filled with 25mL distilled water 2 S, then add 0.72g of sublimed sulfur, put the solution at room temperature and stir it with a magnetic stirrer for about 2h until the color of the solution changes from yellow to orange, and the mixed material is obtained;

[0056] (2) Dissolve 750mg of porous carbon fibers in 750mL of NMP, heat in a water bath to 30°C, and keep the temperature constant for 5 hours of ultrasonication;

[0057] (3) In the presence of an appropriate amount of surfactant CTAB, the mixed material described in step (1) is mixed in the porous carbon nanofiber dispersion, and after 3 hours of ultrasonic dispersion, the resulting solution is added dropwise to 2mol / L of HCOOH In the solution, a precipitate is obtained, and the precipitate is filtered. In order to eliminate excess salt and impurities, the precipitate needs to be washed 3 times with acetone and distilled water, and finally the precipitate is placed in a drying oven at ...

Embodiment 2

[0061] (1) Add 1.16gNa to a beaker filled with 50mL distilled water 2 S, then add 1.45g of sublimed sulfur, the solution is placed at room temperature and stirred with a magnetic stirrer for about 2h until the color of the solution changes from yellow to orange, and the mixed material is obtained;

[0062] (2) Dissolve 750mg of porous carbon fibers in 750mL of NMP, heat in a water bath to 30°C, and keep the temperature constant for 5 hours of ultrasonication;

[0063] (3) In the presence of an appropriate amount of surfactant CTAB, the mixed material described in step (1) is mixed in the porous carbon nanofiber dispersion, and after 3 hours of ultrasonic dispersion, the resulting solution is added dropwise to 2mol / L of HCOOH In the solution, a precipitate is obtained, and the precipitate is filtered. In order to eliminate excess salt and impurities, the precipitate needs to be washed 3 times with acetone and distilled water, and finally the precipitate is placed in a drying ov...

Embodiment 3

[0066] (1) Add 1.74gNa to a beaker filled with 75mL distilled water 2 S, then add 2.16g of sublimed sulfur, the solution is placed at room temperature and stirred with a magnetic stirrer for about 2h until the color of the solution changes from yellow to orange, and the mixed material is obtained;

[0067] (2) Dissolve 750mg of porous carbon fibers in 750mL of NMP, heat in a water bath to 30°C, and keep the temperature constant for 5 hours of ultrasonication;

[0068] (3) In the presence of an appropriate surfactant CTAB, mix the mixed material described in step (1) in the porous carbon nanofiber dispersion, and after 3 hours of ultrasonic dispersion, add the resulting solution dropwise to 2mol / L of HCOOH In the solution, a precipitate is obtained, and the precipitate is filtered. In order to eliminate excess salt and impurities, the precipitate needs to be washed 3 times with acetone and distilled water, and finally the precipitate is placed in a drying oven at 50°C Dry for ...

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Abstract

The invention relates to a composite material, its preparation method and application in lithium ion batteries. The preparation method of the composite material comprises the following steps: (1) mixing water, sodium sulfide and sublimed sulfur to obtain a mixed material; (2) mixing porous carbon nanofibers with a solvent to obtain a porous carbon nanofiber dispersion; (3) ) mixing the mixed material, porous carbon nanofiber dispersion, surfactant and acid solution to obtain a precipitate; (4) placing the precipitate in a closed container for heat treatment to obtain a composite material. The present invention uses the chemical deposition method combined with the heating sublimation method to avoid some disadvantages of the single use of the chemical deposition method or the heating sublimation method to prepare nano-sulfur / porous carbon composite materials, and achieves the complementary effects of the advantages and disadvantages of the two methods; at the same time, the method has mature technology , the advantages of simple operation and easy large-scale production, and finally realize the high value-added utilization of nanoporous carbon / sulfur composites.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a composite material, its preparation method and its application in lithium ion batteries. Background technique [0002] As a new generation of clean energy, lithium-ion batteries have the advantages of high output voltage, high energy density, small self-discharge, long cycle life, no memory effect, fast charging and discharging, and environmental protection, and are widely used in various fields. After nearly two decades of development, the lithium-ion battery industry chain has formed an industrial chain system with a high degree of specialization and a clear division of labor. [0003] A lithium-sulfur battery uses sulfur as the positive electrode of the battery and metallic lithium as the negative electrode. It has the advantages of high energy density, high theoretical capacity, abundant raw materials, and low cost. It can be widely used in aviation a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/38H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 谭强强董子杰冯海兰
Owner 中科(马鞍山)新材料科创园有限公司