A kind of sioc microsphere, its preparation method and its application in lithium-ion battery negative electrode material
A technology of microspheres and polysiloxane, applied in battery electrodes, secondary batteries, circuits, etc.
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[0032] The invention provides a method for preparing SiOC microspheres, comprising the following steps:
[0033] Mix polysiloxane, liquid pore former and catalyst to obtain oil phase; mix water and surfactant to obtain water phase;
[0034] adding the oil phase dropwise to the water phase to form an oil-in-water emulsion;
[0035] solidifying the oil phase in the oil-in-water emulsion to obtain a gel;
[0036] The gel was heat-treated under an inert atmosphere to obtain SiOC microspheres.
[0037] The method provided by the invention utilizes the emulsion template method combined with the liquid pore-forming process, uses liquid organic matter stable at room temperature as the pore-forming agent, and adopts a simple emulsion template method to prepare a microspherical SiOC negative electrode with high porosity, avoiding the use of hydrothermal polymerization, supercritical Complex processes such as drying and mechanical crushing and screening; the interior of the repeatedly ...
Embodiment 1
[0056] Mix hydrogen-containing polysiloxane and polydimethylsiloxane in a mass ratio of 1:4 by magnetic stirring for 30 minutes. Then, platinum divinyltetramethyl-disiloxane complex (accounting for 1% of the mass of hydrogen-containing polysiloxane) was added into the mixture, and stirred for 15 minutes to form an oil phase. In another beaker, 20 wt.% Tween 80 was added to deionized water to obtain an aqueous phase. The mass ratio of water and oil phase is 50:1. After the water phase and the oil phase are mixed uniformly, while stirring, the oil phase is added drop by drop into the water phase to form an oil-in-water emulsion. After stirring rapidly for 15 minutes, the emulsion was heated in an oven at 80 °C for 12 hours. During this process, the oil phase liquid rapidly gels and solidifies. The obtained gel was pyrolyzed at 1000° C. for 3 h in a flowing argon atmosphere to obtain SiOC microspheres.
Embodiment 2
[0057] Example 2: Mix polymethylphenylsiloxane and phenolic resin with a mass ratio of 1:2 by magnetic stirring for 30 minutes. Then, dibutyltin dilaurate (accounting for 0.5% of the mass of polymethylphenylsiloxane) was added into the mixture, and stirred for 15 minutes to form an oil phase. In another beaker, 10 wt.% Tween 20 was added to deionized water to obtain an aqueous phase. The mass ratio of water and oil phase is 30:1. After the water phase and the oil phase are mixed uniformly, while stirring, the oil phase is added drop by drop into the water phase to form an oil-in-water emulsion. After stirring rapidly for 15 minutes, the emulsion was irradiated with ultraviolet light for 6 hours. During this process, the oil phase liquid rapidly gels and solidifies. The obtained gel was pyrolyzed at 1100° C. for 3 h in a flowing argon atmosphere to obtain SiOC microspheres.
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