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Conductive polymer/ionic polymer/graphene multifunctional film layer coated carbon/sulfur composite positive electrode material and preparation method thereof

A composite positive electrode material and ionic polymer technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing the market competitiveness of lithium-sulfur batteries, affecting the volumetric energy density of batteries, ignoring the requirements of high Coulombic efficiency, etc., to achieve The effect of improving electrode material shedding phenomenon, good deformation resistance and good cycle performance

Active Publication Date: 2018-08-10
深圳启辰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application of these carbon materials and oxide materials has improved some aspects of the performance of sulfur cathode composite materials, such as specific capacity, rate performance, cycle performance, etc., but the requirements for high Coulombic efficiency are often ignored.
The coulombic efficiency is particularly important as an industrially produced lithium-sulfur battery. The reason is that the low coulombic efficiency will quickly consume the lithium salt in the electrolyte and corrode the lithium negative electrode, resulting in a rapid decay of the battery capacity; the particles of the sulfur positive electrode are generally in the nanometer And sub-micron size, although this scale material improves the specific capacity and rate performance of sulfur batteries, but because of its large specific surface area, it increases the amount of electrolyte used and reduces the overall mass energy density of the battery; the particle size is too large Small results in low compaction density of the material, which also affects the volumetric energy density of the battery
In summary, it will greatly reduce the market competitiveness of lithium-sulfur batteries

Method used

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  • Conductive polymer/ionic polymer/graphene multifunctional film layer coated carbon/sulfur composite positive electrode material and preparation method thereof
  • Conductive polymer/ionic polymer/graphene multifunctional film layer coated carbon/sulfur composite positive electrode material and preparation method thereof
  • Conductive polymer/ionic polymer/graphene multifunctional film layer coated carbon/sulfur composite positive electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step: the specific surface area after treatment is ≥ 1200cm3 Ketjen black and commercialized sulfur with a purity of 99.5% are mixed according to a weight ratio of 1:9 and put into a closed container filled with an organic solvent carbon disulfide solution, which is dissolved by ultrasonic and vacuum evaporated at low temperature, and the ultrasonic time is 30 minutes , the vacuum degree is 500 Pascals, and the evaporation temperature is 30 degrees. When the organic solution is completely evaporated, a carbon / sulfur compound is obtained;

[0028] The second step: put 1 gram of the obtained carbon / sulfur complex into 200 milliliters of graphene oxide (GO) aqueous solution with a concentration of 0.5 mg / mL for stirring, and add 20 ml of a sodium metabisulfite aqueous solution with a concentration of 50 mg / ml dropwise , the reaction time is 3 minutes, filtered and washed to obtain a redox graphene (RGO)-coated carbon / sulfur composite with a particle size of about ...

Embodiment 2

[0034] The first step: same as embodiment one.

[0035] The second step: put the obtained 1g compound into the graphene oxide aqueous solution containing 200 ml concentration of 1mg / mL for stirring, add dropwise 100ml concentration of 50mg / ml sodium metabisulfite aqueous solution, the reaction time is 2 minutes, Filtration and cleaning to obtain a redox graphene (RGO)-coated carbon / sulfur composite with a particle size of about 8 microns;

[0036] The third step: adding 10 milliliters of 1% dopamine aqueous solution gradually into 200 milliliters of 5 mg / ml graphene-coated carbon / sulfur complex aqueous solution, the reaction time is 20 minutes, and the reaction temperature is 30 degrees , and then obtain polydopamine / graphene (PDA / RGO) coated carbon / sulfur composite after filtering, washing and drying;

[0037] Step 4: Put 1 g of the composite into a low-temperature vapor deposition container, the flow ratio of the polymer monomer aniline (AN) and the oxidant iron oxide is 8:...

Embodiment 3

[0040] The first step: mix the treated Supper P and commercial sulfur (purity 99.5%) according to the weight ratio of 1:8 and put it into a closed container filled with carbon disulfide solution, and after ultrasonic and low-temperature vacuum evaporation treatment, get carbon / sulfur complex. The ultrasonic time is 60 minutes, the vacuum degree is 500 Pascals, and the evaporation temperature is 30 degrees;

[0041] The second step: put the obtained 2g compound into the graphene oxide aqueous solution containing 100 ml concentration of 2mg / mL for stirring, add dropwise 100ml concentration of 60mg / ml sodium metabisulfite aqueous solution, the reaction time is 10 minutes, Filtration and cleaning to obtain a redox graphene (RGO)-coated carbon / sulfur composite with a particle size of about 15 microns;

[0042] The third step: adding 10 milliliters of 0.5% dopamine aqueous solution gradually into 100 milliliters of 1% graphene-coated carbon / sulfur composite aqueous solution, the re...

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Abstract

The invention relates to a conductive polymer / ionic polymer / graphene multifunctional film layer coated carbon / sulphur composite material. A graphene functional film layer, an ionic polymer functional film layer and a conductive polymer functional film layer are sequentially coated on the surface of a conductive carbon / sulphur compound. A preparation method comprises the steps of: S1, after mixing conductive carbon and sulphur, putting the mixture in an organic solvent to perform ultrasonic dissolution, and then, performing low-temperature vacuum evaporation; S2, putting the obtained product in graphene oxide aqueous solution to stir, adding a reducing agent, rapidly stirring to obtain a black flocculent precipitate, and performing conventional processing; S3, dispersing the obtained product in ionic polymer monomer aqueous solution to coat, and performing conventional processing; and S4, putting the obtained product in a low-temperature vapour deposition container, introducing a gaseous polymer monomer and an oxidizing agent, and performing conventional processing to obtain the conductive polymer / ionic polymer / graphene multifunctional film layer coated carbon / sulphur composite material. The conductive polymer / ionic polymer / graphene multifunctional film layer coated carbon / sulphur composite cathode material prepared by the invention is novel in structure and excellent in performance; and furthermore, high specific capacity, high coulombic efficiency and long cycle life are realized.

Description

technical field [0001] The invention relates to the technical field of battery positive electrode materials, in particular to a carbon / sulfur composite positive electrode material coated with a conductive polymer / ionic polymer / graphene multifunctional film layer. The invention also relates to a method for the preparation of said material. Background technique [0002] With the rapid development of related fields such as mobile communication, portable electronic equipment, electric vehicles and energy storage equipment, higher and higher requirements are put forward for battery performance, especially specific capacity, energy density, cycle life and rate performance. . Therefore, it is of great strategic significance to develop new lithium-ion secondary batteries with high performance, low cost and environmental friendliness. The performance and price of cathode materials are the bottlenecks that restrict the further development of lithium-ion batteries to high energy dens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/38H01M4/587H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 徐辉刘强覃旭松邓远富齐威虎陈国华
Owner 深圳启辰新能源科技有限公司
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