Modified composite material containing silicon-based material, preparation method thereof and use thereof in lithium ion battery
A technology of composite materials and silicon-based materials, applied in battery electrodes, secondary batteries, active material electrodes, etc., can solve the problems of carbon tubes lack of ductility, unable to prevent and delay particle pulverization, and unable to effectively absorb, etc., to achieve improved Overall performance, improved cycle performance, and reduced electrode crushing effects
Inactive Publication Date: 2018-12-28
JIANGSU TAFEL NEW ENERGY TECH CO LTD +2
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The invention discloses a modified composite material containing a silicon base material, which comprises a silicon base core and a polymer cladding layer covering the surface of the core, and a preparation method and use thereof in a lithium ion battery. The method comprises the steps of : 1) adding a polymer into a liquid solvent and dispersing to obtain a slurry; 2) adding a silicon-based material or a mixture of that silicon-based material and the carbon material into the slurry and mixing the solid and liquid; 3) removing the solvent to obtain a modified composite material containing a silicon-based material. As the polymer coat layer is introduced on the surface of the silicon base core, so that the electrolyte can be isolated and the side reaction of the electrolyte on the surface of the silicon base core can be prevented; the method can also improve the crushing, electrode pulverization and peeling of the silicon-based negative electrode material in the process of processing and using, and reduce the electrode crushing and peeling caused by the huge volume expansion of the silicon-based material in the process of charging and discharging, so as to achieve the purpose of stabilizing the electrode structure and improving the cell cycle performance.
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Property | Measurement | Unit |
Thickness | 5.0 ~ 50.0 | nm |
Particle size | 1.0 ~ 20.0 | µm |
Particle size | 5.0 | µm |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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