Positive electrode for lithium-sulfur battery, method for producing same, and lithium-sulfur battery comprising same
A technology of sulfur battery and positive electrode, applied in the field of positive electrode for lithium-sulfur battery, its manufacture and lithium-sulfur battery containing the same, can solve problems such as low battery capacity, improve capacity characteristics, improve battery life characteristics, overcome battery The effect of capacity issues
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preparation example 1
[0108] [Preparation Example 1: Preparation of Sulfur-Carbon Composite Material]
[0109] Mix sulfur powder and carbon powder at a weight ratio of 9:1 to form a composite. More specifically, elemental sulfur (S 8 , average particle size: 5 μm) and carbon powder (carbon black (Super P)), and then ball milled at 500 rpm for 1 hour to obtain a sulfur-carbon composite material.
preparation example 2
[0110] [Preparation Example 2: Preparation of Sulfur-Carbon Compound]
[0111] 12.5 g of polyacrylonitrile (PAN) and 50 g of sulfur (S) were mixed in a ball mill at 300 rpm for 12 hours. The mixture was heated to 450° C. at a rate of 10° C. / min while flowing nitrogen gas at a rate of 500 sccm, and the mixture was heat-treated in this state for 6 hours to form a sulfur-carbon compound. The sulfur-carbon compound was pulverized into a powder form with a mortar for 30 minutes to obtain a powder of the sulfur-carbon compound conductive material.
[0112] The SEM image of the sulfur-carbon compound conductive material prepared above is shown in image 3 middle. The conductivity measured by EIS (Electrochemical Impedance Spectroscopy) was 0.035 S / cm, and the components measured by EA (Elemental Analysis) are shown in Table 1 below.
[0113] [Table 1]
[0114] components Content in sulfur-carbon compounds (%) sulfur 41.50 carbon 41.56 nitrogen 15.28 ...
preparation example 3
[0117] [Preparation Example 3: Manufacture of lithium-sulfur battery]
[0118]
[0119] Dissolve 1M concentration of DME in an organic solvent composed of tetraethylene glycol dimethyl ether (TEGDME) / dioxolane (DOL) / dimethoxyethane (DME) (mixing volume ratio = 1 / 1 / 1) Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium nitrate (LiNO 3 ) to prepare the electrolyte.
[0120] The positive active material, the conductive material, and the binder were mixed at a ratio of 75:20:5 using a ball mill to obtain a composition for forming a positive active material layer. At this time, the sulfur-carbon composite material obtained in Preparation Example 1 was used as the positive electrode active material, the sulfur-carbon compound obtained in Preparation Example 2 was used as the conductive material, and SBR / CMC with a ratio of 1:1 was used as the binder, wherein the active Material: Conductive Material: Adhesive mix ratio is 75:20:5 by weight. The prepared composition f...
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