Silicon-silicon oxide-carbon composite, method for preparing same, and negative electrode active material for lithium secondary battery comprising same
A technology of carbon composite materials and active materials, applied in the direction of battery electrodes, silicon oxide, negative electrodes, etc., can solve the problems of cycle characteristics enhancement, limitation, and large volume change, and achieve the goal of improving capacity, enhancing cycle characteristics and initial efficiency Effect
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Embodiment 1
[0187] Preparation of silicon / silicon oxide-carbon composites
[0188] Step 1: 8 kg of silicon powder with an average particle diameter of 20 μm and 16 kg of silicon dioxide powder with an average particle diameter of 20 nm were added to 50 kg of water, uniformly mixed for 12 hours, and then dried at 200° C. for 24 hours to obtain silicon-silica mixture.
[0189] Step 2: The silicon-silicon oxide mixture and 1 kg of metal magnesium were put into a vacuum reactor, and the temperature was raised to 1,400° C. to evaporate and deposit for 5 hours to obtain a silicon-silicon oxide composite material.
[0190] Step 3: The silicon-silicon oxide composite deposited on the substrate in the crucible was rapidly cooled to room temperature by water cooling.
[0191] Step 4: The cooled silicon-silicon oxide composite was pulverized and classified by a particle size-controlled mechanical method to obtain a silicon-silicon oxide composite A (core) with an average particle diameter of 6 μm. ...
Embodiment 2
[0199] Preparation of silicon / silicon oxide-carbon composite material and secondary battery
[0200] A silicon / silicon oxide-carbon composite material was prepared and a secondary battery using the silicon / silicon oxide-carbon composite material was produced in the same manner as in Example 1, except that 2 kg of metallic magnesium was used in step 2 of Example 1 and The reaction in step 5 was carried out at 950°C for 2 hours.
Embodiment 3
[0201] Preparation of silicon / silicon oxide-carbon composite material and secondary battery
[0202] A silicon / silicon oxide-carbon composite material was prepared and a secondary battery using the silicon / silicon oxide-carbon composite material was prepared in the same manner as in Example 1, except that in step 5 of Example 1, reaction 3.5 was carried out at 850°C Hour.
[0203] Preparation of silicon / silicon oxide-carbon composite material and secondary battery
[0204] A silicon / silicon oxide-carbon composite material was prepared and a secondary battery using the silicon / silicon oxide-carbon composite material was fabricated in the same manner as in Example 1, except that in step 5 of Example 1, the temperature was 1,050° C. Argon, methane and carbon dioxide gases flowing at 1 liter / min were reacted for 1 hour.
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