Preparation method of silicon-carbon negative electrode material of layered structure
A negative electrode material and layered structure technology, which is applied in the field of preparation of silicon-carbon negative electrode materials with a layered structure, can solve problems that hinder the application of silicon negative electrode materials for lithium-ion batteries, electrode materials lose electrical contact, and material interface instability, etc., to achieve Increased electrical conductivity, reduced overall expansion rate, and low cost effects
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Embodiment 1
[0036] This specific embodiment is to prepare a silicon-carbon negative electrode material with a layered structure, and the specific steps of its preparation process are:
[0037] Step 1, select graphite and silicon particles of flake single particles, the graphite particles of the flake single particles have a length of 5-8 μm, a width of 3-5 μm, and a thickness of 1-3 μm, and the silicon particles of the flake single particles The length is 3-5 μm, the width is 2-4 μm, the thickness is 0.5-2 μm, and the mass ratio of graphite particles to silicon particles is 20:1, so that they are mixed in a high-speed disperser for 2 hours to obtain graphite / silicon mixed powder;
[0038] Step 2. Add graphite / silicon mixed powder into a deionized aqueous solution with a mass percentage of carbon source precursor of 1%, and the carbon source precursor is a composition of polyethylene glycol ether and diethyl phthalate , by physically stirring and ultrasonically dispersing 5H to obtain a mi...
Embodiment 2
[0044] This specific embodiment is to prepare a silicon-carbon negative electrode material with a layered structure, and the specific steps of its preparation process are:
[0045] Step 1, select graphite and silicon particles of flake single particles, the graphite particles of the flake single particles have a length of 8-12 μm, a width of 5-8 μm, and a thickness of 1-3 μm, and the silicon particles of the flake single particles The length is 5-8 μm, the width is 3-5 μm, the thickness is 0.5-2 μm, and the mass ratio of graphite particles to silicon particles is 10:1, so that they are mixed in a high-speed disperser for 6 hours to obtain graphite / silicon mixed powder;
[0046] Step 2. Add the graphite / silicon mixed powder into a deionized aqueous solution with a carbon source precursor of 10% by mass. The carbon source precursor is pitch, and disperse the mixed powder by physical stirring and ultrasonic dispersion for 13H to obtain a mixed powder suspension liquid;
[0047] ...
Embodiment 3
[0052] This specific embodiment is to prepare a silicon-carbon negative electrode material with a layered structure, and the specific steps of its preparation process are:
[0053] Step 1, select graphite and silicon particles of flake-like single particles, the graphite particles of the flake-like single particles have a length of 12-15 μm, a width of 8-10 μm, and a thickness of 1-3 μm, and the silicon particles of the flake-like single particles The length is 8-10 μm, the width is 5-7 μm, and the thickness is 0.5-2 μm. The mass ratio of graphite particles to silicon particles is 5:2, and they are mixed in a high-speed disperser for 10 hours to obtain graphite / silicon mixed powder;
[0054] Step 2. Add the graphite / silicon mixed powder into a deionized aqueous solution with a carbon source precursor of 20% by mass. The carbon source precursor is a composition of methanol, acetone and ethyl acetate. Physical stirring and ultrasound Disperse for 20 hours to obtain a mixed powde...
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