Sulfur-carbon composite, lithium-sulfur battery positive electrode comprising same, and lithium-sulfur battery comprising positive electrode
A sulfur-carbon composite, cathode technology, applied in battery electrodes, lithium storage batteries, active material electrodes, etc., can solve the problems of low hydrophilic modification effect, destruction of conjugated network, deterioration of electrical conductivity, etc. Effects of conductivity, improved reactivity, and life characteristics
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preparation example 1
[0119] Preparation Example 1: Preparation of Copolymer Represented by Formula 1 (Monomer Molar Ratio 3:7)
[0120] Inhibitors were removed from 12.5 ml of polyethylene glycol methyl ether acrylate (PEGMEA) by column chromatography packed with 30 g of basic alumina.
[0121] After adding 20 ml of DMF into a 500 ml two-neck round bottom flask, 7.5 g of purified PEGMEA (Mn=480), 1.7 g of dopamine methacrylamide (DMA) and 106 mg of azobisisobutyronitrile were dissolved in DMF middle. After the reaction mixture was treated with N 2 (Gas) After degassing for 10 minutes, the mixture was stirred at 60° C. for 17 hours. After the reaction was completed, the reaction product was precipitated using 800ml of n-hexane in a 1000ml beaker to obtain a polyDMA-PEGMEA copolymer having a monomer molar ratio of 3:7 and a weight average molecular weight of 250000.
preparation example 2
[0122] Preparation Example 2: Preparation of a copolymer represented by Formula 1 (monomer molar ratio 5:5)
[0123] Inhibitors were removed from 12.5 ml of polyethylene glycol methyl ether acrylate (PEGMEA) by column chromatography packed with 30 g of basic alumina.
[0124] After adding 20 ml of DMF into a 500 ml two-neck round bottom flask, 10 g of purified PEGMEA (Mn=480), 1.2 g of dopamine methacrylamide (DMA) and 106 mg of azobisisobutyronitrile were dissolved in DMF . After the reaction mixture was treated with N 2 (Gas) After degassing for 10 minutes, the mixture was stirred at 60° C. for 17 hours. After the reaction was completed, the reaction product was precipitated using 800ml of n-hexane in a 1000ml beaker to obtain a polyDMA-PEGMEA copolymer having a monomer molar ratio of 5:5 and a weight average molecular weight of 250000.
preparation example 3
[0125] Preparation Example 3: Preparation of PolyDMA-PEGMEA Copolymer Coated Carbon Material (Monomer Molar Ratio=3:7)
[0126] 10 g of the polyDMA-PEGMEA copolymer prepared in Preparation Example 1 was dissolved in 90 g of distilled water to prepare a coating agent having a concentration of 10% by weight, which was then diluted to be used as a coating agent.
[0127] The coating agent was mixed with 10 g of carbon nanotubes (trade name: Multiwall CNT, manufacturer: Aldrich (Aldrich)) to prepare a polyDMA-PEGMEA copolymer-coated carbon material (carbon material: polyDMA- Weight ratio of PEGMEA copolymer = 99:1).
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