Treatment method of pre-lithiated SiOx negative electrode material
A technology of negative electrode material and processing method, which is applied in the processing field of pre-lithiated SiOx negative electrode material and can solve the problems of poor stability of pre-lithiated SiOx negative electrode material and the like
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[0057]Example 1
[0058]The processing method of the pre-lithiated SiOx negative electrode material of this embodiment is as follows:
[0059]1) Combine 100g 6μm SiO and 10g Li2O was mixed by mechanical ball milling for 3 hours, and then calcined at 500°C for 2 hours under the protection of an inert atmosphere of nitrogen to obtain a pre-lithiated SiOx negative electrode material, which was recorded as sample S1;
[0060]Take 100g of S1 with a particle size of 6μm and a carbon coating content of 3wt%, and take NH4F 5g, stir at room temperature for 1 hour, mix uniformly, then put the mixed sample in a tube furnace, and pass in nitrogen at a rate of 50mL / min. After nitrogen has been passed in for half an hour, start to heat up to 190°C. The temperature was controlled at 30°C / min, the temperature was raised to 190°C, and the temperature was kept for 0.5h. The obtained powder was ground and sieved to finally obtain a pre-lithiated SiOx negative electrode material coated with a layer of LiF, whic...
Example Embodiment
[0061]Example 2
[0062]The processing method of the pre-lithiated SiOx negative electrode material of this embodiment is as follows:
[0063]Mix 10g of biphenyl with 100g of tetrahydrofuran, then add 0.5g of lithium metal powder to obtain an organic solution containing lithium metal, then add 10g of 6μm SiO, stir for 12h, filter, and wash with tetrahydrofuran to obtain pre-lithiated SiOx anode material, denoted as Sample S2;
[0064]Take 100g of S2 with a particle size of 6μm and a carbon coating content of 3wt%, and take NH4F 5g, stir at room temperature for 1 hour, mix uniformly, then put the mixed sample in a tube furnace, and pass in nitrogen at a rate of 50mL / min. After nitrogen has been passed in for half an hour, start to heat up to 190°C. The temperature was controlled at 30°C / min, the temperature was raised to 190°C, and the temperature was kept for 0.5h. The obtained powder was ground and sieved to finally obtain a pre-lithiated SiOx negative electrode material coated with a layer...
Example Embodiment
[0065]Example 3
[0066]The processing method of the pre-lithiated SiOx negative electrode material of this embodiment is as follows:
[0067]Mix 100g of 6μm SiO anode with 5g of lithium metal powder, then add 100g of electrolyte to it, and let stand for 12h at room temperature to obtain pre-lithiated SiOx anode material, denoted as sample S3, where the solute of the electrolyte is 1.2mol / L Lithium hexafluorophosphate, the solvent is ethylene carbonate EC;
[0068]Take 100g of S3 with a particle size of 6μm and a carbon coating content of 3wt%, and take NH4F 5g, stir at room temperature for 1 hour, mix uniformly, then put the mixed sample in a tube furnace, and pass in nitrogen at a rate of 50mL / min. After nitrogen has been passed in for half an hour, start to heat up to 190°C. The temperature was controlled at 30°C / min, the temperature was raised to 190°C, and the temperature was kept for 0.5h. The obtained powder was ground and sieved to finally obtain a pre-lithiated SiOx negative electro...
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