Graphite-silicon composite lithium-ion battery negative electrode material and preparation method
A negative electrode material, ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of nano-silicon agglomeration, difficult to find, low carbon residue, etc.
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Embodiment 1
[0056] In the presence of isopropanol dispersion medium, use a grinding machine to grind silicon, and add fumaric acid to the silicon grinding solution to control the pH value of the silicon grinding dispersion at 5.5, and the mass solid content is about 12%. The average particle size of the silicon particles in the silicon polishing liquid is 150nm. The dispersion medium in the silicon grinding liquid is isopropanol.
[0057] Graphite particles are selected from natural graphite SG11 (BTR), mechanically crushed to a D50 of 6um.
[0058] Add 163 parts by weight of isopropanol to a glass reactor equipped with a reflux condenser, a separatory funnel, a thermometer, and a nitrogen pipe, add 10 parts by weight of polyvinylpyrrolidone PVP while stirring, and heat up to 50°C to completely dissolve it into a uniform Transparent solution, then add 40wt% styrene and 60wt% acrylonitrile monomer, heat up to 73 ° C, then add the initiator solution, the initiator solution is heated and diss...
Embodiment 2
[0065] In the presence of an ethanol dispersion medium, use a grinder to grind silicon, and add oleic acid to the silicon grinding liquid to control the pH value of the silicon grinding dispersion to 5.5, and the mass solid content to be about 12%. The average particle size of the silicon particles in the silicon polishing liquid is 150nm. The dispersion medium in the silicon grinding liquid is ethanol.
[0066] Graphite particles are artificial graphite CAG-3MT (Shanshan Technology), mechanically crushed to a D50 of 5um.
[0067] Add 163 parts by weight of ethanol to a glass reactor equipped with a reflux condenser, a separatory funnel, a thermometer, and a nitrogen pipe, add 10 parts by weight of polyvinylpyrrolidone PVP while stirring, and heat up to 50°C to completely dissolve it into a uniform and transparent Solution, then add 40wt% butyl acrylate and 60wt% acrylonitrile monomer, heat up to 73 ° C, then add the initiator solution, the initiator solution is heated and di...
Embodiment 3
[0074] In the presence of a low-boiling point organic solvent dispersion medium, use a grinder to grind silicon, and add an organic weak acid (see Table 1) to the silicon grinding liquid to control the pH value of the silicon grinding dispersion (see Table 1). The content is (see Table 1) or so. The average particle size of the silicon particles in the silicon slurry is (see Table 1). Types of low-boiling organic solvents in dispersion media in silicon grinding fluids (see Table 1).
[0075] Graphite particles are selected (see Table 1).
[0076] Add 163 parts by weight of a low-boiling point organic solvent (see Table 1) to a glass or high-pressure resistant (butadiene) reactor equipped with a reflux condenser, a separatory funnel, a thermometer, and a nitrogen vent pipe, and add organic alcohol while stirring Soluble high molecular polymer (see Table 1 for type and quantity), heated up to 50°C to completely dissolve into a uniform and transparent solution, then add copolym...
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