Nano silicon particles filled carbon nano tube compound as well as preparation method and application thereof
A technology of carbon nanotubes and nano-silicon, which is applied in the field of lithium-ion battery anode materials, can solve problems such as poor cycle performance, low Coulombic efficiency, and difficulty in controlling the size of silicon particles, and achieve long cycle life and high Coulombic efficiency.
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Embodiment 1
[0028] High-purity (purity above 99.8wt%) aluminum sheet uses 3wt% oxalic acid solution as the electrolyte, anodizes at 20°C and 40V for 4 hours to prepare holes at both ends, with a thickness of 40 microns and a pore size of 50 Nanoscale anodized aluminum oxide films are used as templates. After the anodized aluminum template was dried, the chemical vapor deposition of acetylene was carried out at 650°C for 2 hours, using nitrogen as the carrier gas, the total flow rate of the reaction gas was 200ml / min, the volume concentration of acetylene gas was 10%, and the thickness of the deposited carbon layer was 6 Nano. The carbon-deposited anodized aluminum template was subjected to chemical vapor deposition of silane at 500°C for 5 minutes, using argon as the carrier gas, the total flow rate of the reaction gas was 50ml / min, and the volume concentration of silane was 2%. Use 10wt% phosphoric acid solution to remove the aluminum oxide template after silicon deposition, to obtain c...
Embodiment 2
[0031] The preparation method of the anodized aluminum template is the same as in Example 1. The difference is that the anodic oxidation voltage is 45V, and the pore size of the prepared anodized alumina template is: 65 nanometers. After the alumina template is dried, the chemical vapor deposition of ethylene is carried out at 700 ° C for 2 hours, nitrogen is used as the carrier gas, and the reaction gas is The total flow rate is 200ml / min, the volume concentration of ethylene gas is 5%, and the thickness of the deposited carbon layer is 6 nm. The carbon-deposited anodized aluminum template was subjected to chemical vapor deposition of silane at 600°C for 20 minutes, hydrogen was used as the carrier gas, the total flow rate of the reaction gas was 100ml / min, and the volume concentration of silane was 2%. A 10wt% phosphoric acid solution is used to remove the aluminum oxide template after silicon deposition to obtain carbon nanotubes in which silicon particles are completely an...
Embodiment 3
[0034] The preparation method of the anodized aluminum template is the same as in Example 1, except that the anodic oxidation voltage is 60V, and the pore size of the prepared anodized aluminum template is: 100nm. After the aluminum oxide template is dried, chemical vapor deposition of acetylene is carried out at 700°C. For 2 hours, argon is used as the carrier gas, the total flow rate of the reaction gas is 300ml / min, the volume concentration of acetylene gas is 10%, and the thickness of the deposited carbon layer is 15 nm. The carbon-deposited anodized aluminum template was subjected to chemical vapor deposition of silane at 550°C for 30 minutes, using hydrogen as the carrier gas, the total flow rate of the reaction gas was 50ml / min, and the volume concentration of silane was 5%. A 10wt% phosphoric acid solution was used to remove the silicon-deposited alumina template to obtain carbon nanotubes filled with silicon particles uniformly in the hollow lumen, and the inner diamet...
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