Manufacturing method of film layer-structure pre-lithiation silicon carbon negative electrode
A technology of pre-lithiated silicon carbon and film layer structure, which is applied to negative electrodes, structural parts, battery electrodes, etc., can solve the problems of unstable electrode structure and low first coulomb efficiency of silicon carbon negative electrodes, and achieves convenient processing and economic benefits. Significant and improved Coulombic efficiency
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Embodiment 1
[0024] A method for preparing a film-structured pre-lithiated silicon-carbon material electrode, comprising the following steps:
[0025] (1) Add 50 mg of silicon carbon material, 20 mg of graphene, 20 mg of carbon nanotube, 10 mg of carbon nanofiber, and 10 mg of sodium dodecylbenzenesulfonate into 50 mL of anhydrous acetonitrile, mechanically stir for 2 h, and ultrasonically disperse for 0.5 h to obtain stable , Uniform dispersion a, the concentration of the dispersion is 2mg / mL;
[0026] (2) Add 5 mg of lithium phosphide, 5 mg of carbon nanotubes, 10 mg of carbon nanofibers, 10 mg of graphene, and 10 mg of polyvinylpyrrolidone into 20 mL of anhydrous toluene, mechanically stir for 2 h, and ultrasonically disperse for 0.5 h to obtain a stable and uniform dispersion b, the concentration of the dispersion is 1.5mg / mL;
[0027] (3) Suction-filter the dispersions a and b in sequence, each time the volume of the dispersion is 20mL, to obtain a pre-lithiated silicon carbon negati...
Embodiment 2
[0030] A method for preparing a film-structured pre-lithiated silicon-carbon material electrode, comprising the following steps:
[0031] (1) Add 4g of silicon-carbon material, 0.5g of carbon nanotubes, 0.5g of carbon nanofibers, and 0.2g of stearic acid into 100mL of absolute ethanol, mechanically stir for 12 hours, and ultrasonically disperse for 3 hours to obtain a stable and uniform dispersion a. The concentration of the dispersion is 50mg / mL;
[0032] (2) Add 0.4g of lithium phosphide, 0.05g of carbon nanotubes, 0.05g of carbon nanofibers, and 0.3g of sodium octadecyl sulfate into 50mL of anhydrous acetonitrile, mechanically stir for 6 hours, and ultrasonically disperse for 3 hours to obtain a stable and uniform Dispersion b, the concentration of the dispersion is 10mg / mL;
[0033] (3) Sequentially cross suction filter the dispersion liquid a and b twice each, and finally suction filter the dispersion liquid a once again. The volume of the dispersion liquid taken by each...
Embodiment 3
[0037] A method for preparing a film-structured pre-lithiated silicon-carbon material electrode, comprising the following steps:
[0038] (1) Add 4g of silicon carbon material, 0.5g of carbon nanotubes, 0.5g of graphene, and 0.1g of polyvinylpyrrolidone into 50mL of anhydrous acetonitrile, mechanically stir for 5 hours, and ultrasonically disperse for 1 hour to obtain a stable and uniform dispersion a. Liquid concentration is 100mg / mL;
[0039] (2) Add 10 mg of lithium phosphide, 20 mg of carbon nanotubes, 20 mg of graphene, and 2 mg of hexadecyltrimethylammonium bromide into 100 mL of anhydrous toluene, magnetically stir for 0.5 h, and ultrasonically disperse for 0.1 h to obtain stable and uniform Dispersion b, the concentration of the dispersion is 0.5mg / mL;
[0040] (3) Cross suction and filter the dispersion liquids a and b three times in sequence, and the volume of the dispersion liquid taken by each suction filtration is 10mL to obtain a pre-lithiated silicon carbon neg...
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