Silicon-based composite material and preparation method thereof, negative electrode material and lithium battery
A silicon-based composite material and silicon-based material technology, applied in the field of materials, can solve problems such as excessive specific surface area and dispersion, and achieve the effects of excellent cycle performance, increased interface bonding force, and easy mass production.
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Embodiment 1
[0037] The preparation method comprises the following steps (1)-(3):
[0038] (1) Under vacuum conditions, silicon and silicon dioxide are uniformly mixed according to the molar ratio of 1:1 and heated to 1400 degrees Celsius, and natural graphite at a temperature of 600 degrees Celsius is used as the deposition substrate to deposit silicon oxide at a mass ratio of 1:5 ;
[0039] (2) The obtained material is mixed with petroleum pitch according to the mass ratio of 8:2 and then heat-treated at 850° C. for 2 hours;
[0040] (3) Physically demagnetize the obtained material.
[0041] The particle size of the material was measured by a Malvern laser particle size analyzer, and the specific surface area of the material was measured by a nitrogen adsorption method.
[0042] The average particle size of the obtained material is 20 microns, and the specific surface area is 5m 2 / g. The mass fraction of carbon material is 70%, the mass fraction of silicon-based material is 14%, a...
Embodiment 2
[0048] This example is intended to illustrate the effect of the carbon coating method on the material.
[0049] The preparation method comprises the following steps (1)-(2):
[0050] (1) Under vacuum conditions, silicon and silicon dioxide are uniformly mixed according to the molar ratio of 1:1 and heated to 1400 degrees Celsius, and natural graphite at a temperature of 600 degrees Celsius is used as the deposition substrate to deposit silicon oxide at a mass ratio of 1:5 ; After the deposition is completed, toluene is sent into the cavity according to the mass ratio, and the temperature is raised to 900 degrees at the same time, and the temperature is kept for 2 hours;
[0051] (2) Physically demagnetize the obtained material.
[0052] The average particle size of the obtained material is 20 microns, and the specific surface area is 2m 2 / g. The mass fraction of carbon material is 70%, the mass fraction of silicon-based material is 14%, and the rest is carbon coating layer...
Embodiment 3
[0055] This example is intended to illustrate the effect of varying the ratio of silicon and silicon dioxide on the material.
[0056] The preparation method comprises the following steps (1)-(3):
[0057] (1) Under vacuum conditions, uniformly mix silicon and silicon dioxide at a molar ratio of 1.2:1 and heat to 1400 degrees Celsius, and use natural graphite at a temperature of 600 degrees Celsius as a deposition substrate to deposit silicon oxide at a mass ratio of 1:5 ;
[0058] (2) The obtained material is mixed with petroleum pitch according to the mass ratio of 8:2 and then heat-treated at 850° C. for 2 hours;
[0059] (3) Physically demagnetize the obtained material.
[0060] The average particle size of the obtained material is 20 microns, and the specific surface area is 5m 2 / g. The mass fraction of carbon material is 70%, the mass fraction of silicon-based material is 14%, and the rest is a carbon coating layer. The mass fraction of silicon in the silicon-based ...
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