A lithium-sulfur battery positive electrode material with nitrogen-doped porous carbon loaded with metal nickel and its preparation method and application
A nitrogen-doped porous carbon and metal-loaded technology, which is applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of complex and expensive nanocomposite materials, improve rate performance and stability, enhance adsorption, The effect of enhancing the adsorption performance
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Embodiment 1
[0036] Preparation of nitrogen-doped porous carbon material: 1.66 grams of 7nm and 32 grams of 22nm Ludox colloidal silica were stirred and mixed, ultrasonicated for 24 hours, and then dried at room temperature for one week to obtain a silica template. Afterwards, it was immersed in a mixed solution of resorcinol / formaldehyde with a molar ratio of 1:2, left to stand in an ice-water bath for 3 hours, and then subjected to suction filtration. Then, it was dried at 85° C. and 120° C. for 24 hours, respectively. After the second suction filtration, the obtained sample was calcined at 900°C for 4 hours under argon with a heating rate of 10°C / min to obtain a composite material (RF) of silica and resorcinol formaldehyde resin. The above material is immersed in hydrofluoric acid to wash off the silicon dioxide to obtain a nitrogen-doped porous carbon material.
[0037] 5 g of nitrogen-doped porous carbon material was taken to absorb water vapor under the flow of ammonia gas (100 Sccm...
Embodiment 2
[0040] 0.7g of the nitrogen-doped porous carbon-supported metallic nickel material (RF-Ni-800) obtained in Example 1 was immersed in 0.3g of sulfur at 155°C for 6 hours, and then nitrogen-doped porous carbon-supported metallic nickel Material, carbon black and polyvinylidene fluoride are mixed according to the mass ratio of 8:1:1 as the positive electrode material, assembled with lithium metal and Celgard 2500 separator to form a lithium-sulfur battery, and tested. The active mass loading of all tests is 1-5mg / cm 2 . RF uses the same method to assemble lithium-sulfur batteries.
[0041] figure 2 The charging and discharging diagram of the first cycle of the battery is the RF obtained in Example 2 as the positive electrode carrier of the lithium-sulfur battery and RF-Ni-800 as the positive electrode carrier of the lithium-sulfur battery.
[0042] image 3 Cyclic voltammetry (CV) curves (a) and AC impedance (Nyquist) curves (b) of RF and RF-Ni-800 as cathode supports for li...
Embodiment 3
[0044] 0.7g of the nitrogen-doped porous carbon-supported metallic nickel material (RF-Ni-800) obtained in Example 1 was immersed in 0.3g of sulfur at 155°C for 6 hours, and then the nitrogen-doped porous carbon-supported metallic nickel Material, carbon black and polyvinylidene fluoride (mass ratio 8:1:1) are mixed as the positive electrode material, assembled with lithium metal and Celgard 2500 separator to form a lithium-sulfur battery, and the active mass loading of all tests is 1-5mg / cm 2 . RF uses the same method to assemble lithium-sulfur batteries.
[0045] Figure 4It is a comparison of the rate performance of nitrogen-doped porous carbon material (RF) and nitrogen-doped porous carbon-supported metal nickel (RF-Ni-800) at current densities of 0.1C, 0.2C, 0.5C, 1C, 2C and 3C. Among them, the cycle stability performance at a current density of 1C, even after 200 cycles, the capacity can still be maintained at 700mAh / g, and the attenuation of each cycle is extremely ...
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