Lithium-sulfur battery cathode material, preparation method, and lithium-sulfur battery
A cathode material, lithium-sulfur battery technology, applied in the field of lithium-sulfur battery cathode materials, lithium-sulfur battery materials, preparation, can solve the problem of reducing the electrochemical activity of the sulfur electrode conductivity, reducing the discharge capacity of the sulfur cathode, and the limited effect of coating, etc. problems, to achieve the effect of accelerating the electrode reaction kinetics, inhibiting the shuttle effect, and facilitating penetration
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[0039] Example 1
[0040] The cathode material for the lithium-sulfur battery of this embodiment includes a carbon-sulfur composite material, the surface of which is coated with a carbon coating layer, wherein the thickness of the carbon coating layer is 0.5 μm, and the pore volume of the carbon coating layer is 0.284 cm 3 / g, the particle size of the carbon-sulfur composite material is 2μm.
[0041] The specific operation steps of the method for preparing the cathode material of the lithium-sulfur battery in this embodiment are:
[0042] 1) Put 1.8g of carbon nanotubes with a tube diameter of 20-40nm, 3.9g of sublimed sulfur, and 0.3g of glycine in an agate ball milling tank, control the planetary ball mill at a speed of 400r / min, and ball mill for 6 hours to obtain a homogeneous mixture;
[0043] 2) Transfer the homogeneous mixture prepared in step 1) to a vacuumable container, control the vacuum degree to 0.085MPa, increase the temperature from 25°C to 155°C, and the heating time is...
Example Embodiment
[0049] Example 2
[0050] The positive electrode material of the lithium-sulfur battery in this embodiment includes a carbon-sulfur composite material, the surface of which is coated with a carbon coating layer, wherein the thickness of the carbon coating layer is 4 μm, and the pore volume of the carbon coating layer is 0.241 cm 3 / g, the particle size of the carbon-sulfur composite material is 14μm.
[0051] The specific operation steps of the method for preparing the cathode material of the lithium-sulfur battery in this embodiment are:
[0052] 1) Place 1.2g of graphene, 4.2g of sublimed sulfur, and 0.6g of phenolic resin in an agate ball milling tank, control the planetary ball mill to 900r / min, and mill for 12 hours to obtain a homogeneous mixture;
[0053] 2) Transfer the homogeneous mixture prepared in step 1) to a vacuumable container, control the vacuum degree to 0.095MPa, increase the temperature from 25°C to 155°C, the heating time is 60min; increase the temperature from 155...
Example Embodiment
[0059] Example 3
[0060] The positive electrode material of the lithium-sulfur battery in this embodiment includes a carbon-sulfur composite material, the surface of which is coated with a carbon coating layer, wherein the thickness of the carbon coating layer is 6 μm, and the pore volume of the carbon coating layer is 0.346 cm 3 / g, the particle size of the carbon-sulfur composite material is 27μm.
[0061] The specific operation steps of the method for preparing the cathode material of the lithium-sulfur battery in this embodiment are:
[0062] 1) Put 2.1g of meso-microporous carbon, 3.0g of high-purity sulfur with a purity of 99.95%, and 0.90g of precursor in an agate ball milling tank, where the precursor is a mixture of glucose and glycine mixed at a mass ratio of 1:1 , Control the speed of the planetary ball mill to 600r / min, and the ball mill for 20h to obtain a uniform mixture;
[0063] 2) Transfer the homogeneous mixture prepared in step 1) to a vacuumable container, control...
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