A kind of preparation method of lithium-ion battery silicon-based composite material
A technology of silicon-based composite materials and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor cycle stability, achieve long cycle life, high yield, and simple and easy-to-control process conditions Effect
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[0018] The preparation method of lithium-ion battery silicon-based composite material of the present invention comprises the steps:
[0019] Disperse silicon powder, asphalt, lithium chloride, and tetrabutyl titanate with a weight ratio of 1:0.5~5:0.2~2:2~20 in the tetrahydrofuran solution, and then press the molar ratio of water to tetrabutyl titanate Slowly add a 50% THF aqueous solution at a ratio of 5 to 50:1, stir and react for 2 to 8 hours, and dry to obtain a precursor. In an argon atmosphere at atmospheric pressure, the precursor obtained above was treated at 600-900°C for 5-20 hours at a high temperature to obtain silicon, Li 4 Ti 5 o 12 Silicon-based anode materials for lithium-ion batteries composed of pitch and pyrolytic carbon.
[0020] The particle size of the silicon powder is 1-5 microns; the asphalt is one of petroleum asphalt, coal tar pitch or natural asphalt.
[0021] Li 4 Ti 5 o 12 Nanoparticles and pitch pyrocarbon as a hybrid matrix with certain p...
Embodiment 1
[0024] Disperse silicon powder, petroleum pitch, lithium chloride, and tetrabutyl titanate at a weight ratio of 1:3:0.5:5 in tetrahydrofuran solution, and then use water to tetrabutyl titanate at a molar ratio of 10:1 Slowly add 50% tetrahydrofuran aqueous solution to the ratio, stir and react for 4 hours, and dry to obtain the precursor. In the normal pressure argon atmosphere, the precursor obtained above was treated at 800 ° C for 10 h at a high temperature to obtain silicon, Li 4 Ti 5 o 12 Silicon-based composite materials for lithium-ion batteries composed of pitch and pyrolytic carbon.
[0025] figure 1 is the X-ray diffraction (XRD) spectrum of the lithium-ion battery silicon-based composite material prepared above. It can be seen from the figure that the sharper diffraction peak in the figure is the diffraction peak of silicon, and the relatively broad diffraction peak is the typical Li 4 Ti 5 o 12 diffraction peaks. In addition to the above two phases, there a...
Embodiment 2
[0028] Disperse silicon powder, petroleum asphalt, lithium chloride, and tetrabutyl titanate at a weight ratio of 1:1:0.5:5 in tetrahydrofuran solution, and then use water to tetrabutyl titanate at a molar ratio of 20:1 Slowly add 50% tetrahydrofuran aqueous solution to the ratio, stir and react for 4 hours, and dry to obtain the precursor. In an argon atmosphere at atmospheric pressure, the precursor obtained above was treated at a high temperature of 650 ° C for 15 h, and the silicon, Li 4 Ti 5 o 12 Silicon-based anode materials for lithium-ion batteries composed of pitch and pyrolytic carbon.
[0029] According to the battery conditions of Example 1, the cycle performance of the silicon-based material for lithium-ion batteries prepared in a 2032-type button battery was tested. The test results are: the first discharge capacity of the electrode is 1437.5mAh / g, the first coulombic efficiency is 84.3%, and after 50 cycles, the capacity retention rate is 70.3%.
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