Preparation method of double-layer composite coated silicon material and lithium ion battery thereof
A double-layer composite and silicon-coated technology, which is applied in the field of lithium-ion batteries, can solve problems such as poor cycle performance, complicated preparation process, and high impedance, and achieve the effects of good aspect ratio, easy chemical modification, and high electronic conductivity
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[0035] The double-layer coated silicon material of the present invention (such as figure 1Shown) include nano-silicon particles, carbon tubes (aspect ratio 100-500), organic polymers and lithium salts; organic polymers include PVA, PAN (polyacrylonitrile), polyethylene oxide (PEO), PMMA (polymethylene methyl acrylate), PVDF (polyvinylidene fluoride) and PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene); lithium salts include Li 4 SO 4 , Li 3 N.LiPF 6 , LiClO 4 、LiBF 4 , LiSO 3 CF 3 , LiBOB, LiTFSI[LiN(CF3SO 2 ) 2 ]Wait. The preparation method comprises the following steps: putting a certain amount of nano-silicon particles (50-100nm) into a certain concentration of xylene solution, adding a catalyst, ferrocene, ultrasonically oscillating to make them uniform, and then putting them into In the tube furnace, feed argon gas at a flow rate of 200 sccm for 15 minutes to exhaust the air in the tube, then heat up to 700-900°C for 40 minutes, and then feed H at a flow r...
Embodiment 1
[0041] Put 80g of nano-silicon particles (50nm) into 20mL of 5mol / L xylene solution, and add 15mg of catalyst ferrocene, ultrasonic vibration to make it uniform, then put it into the tube furnace, pass Inject argon gas at a flow rate of 200 sccm for 15 minutes to exhaust the air in the tube, heat up to 800°C for 40 minutes, and then inject H at a flow rate of 150 sccm 2 , after the reaction is over, close the H 2 , under the protection of argon, the tube furnace is lowered to room temperature, and the carbon tube-coated silicon material can be obtained. Using this as a precursor, first, take 5g of organic polymer PVA and place it in a small beaker with 100mL of deionized water, and place it in a constant temperature tank at 85°C, and stir continuously for 1.5h to obtain a clear solution, then add the prepared 20ml of 5mol / LLi 4 SO 4 , stirred magnetically at room temperature for 12 hours, and added the prepared precursor sample of carbon nanotube-coated silicon particles, a...
Embodiment 2
[0043] Put 80g of nano-silicon particles (50nm) into 20mL of 5mol / L xylene solution, and add 15mg of catalyst ferrocene, ultrasonically oscillate to make it uniform, then put it into a tube furnace, Introduce argon gas at a flow rate of 200 sccm for 15 minutes to exhaust the air in the tube, heat up to 800°C for 40 minutes, and then inject H at a flow rate of 150 sccm 2 , after the reaction is over, close the H 2 , under the protection of argon, the tube furnace is lowered to room temperature, and the carbon tube-coated silicon material can be obtained. Using this as a precursor, first, take 7.5g of organic polymer PVA and place it in a small beaker with 100mL of deionized water, and place it in a constant temperature tank at 85°C, and stir continuously for 1.5h to obtain a clear solution, then add Good 20ml of 5mol / LLi 4 SO 4 , stirred magnetically at room temperature for 12 hours, and added the prepared precursor sample of carbon nanotube-coated silicon particles, and con...
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