High-capacity silicon-based anode material for lithium ion battery and preparation method thereof, and lithium ion battery
A silicon-based negative electrode material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as poor long-term cycle performance, silicon volume change, and loss of electrical contact , to achieve the effect of improving cycle performance, increasing electrical conductivity and reducing reduction
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[0032] Example 1
[0033] A method for preparing a silicon-based negative electrode material for a high-capacity lithium ion battery of the present invention, comprising the following steps:
[0034] (1) Add 0.5 g of nano-silicon particles with a particle size of 80 nm to 100 ml of absolute ethanol for ultrasonic dispersion for 60 minutes to obtain a nano-silicon dispersion liquid, and add 5 g of artificial silicon particles with a particle size of 0.6 μm to the dispersion under continuous stirring. The graphite was mixed and stirred for 90 minutes, and then 6.1 g of citric acid was added to the dispersion liquid and continued to be mixed and stirred for 60 minutes. The obtained mixed solution was evaporated to dryness in a water bath and vacuum-baked at 60 ° C for 8 hours to obtain a silicon-carbon composite material precursor;
[0035] (2) calcining the silicon-carbon composite material precursor obtained in step (1) at 450° C. for 3 hours under argon protection, and then g...
Example Embodiment
[0039] Example 2
[0040] A method for preparing a silicon-based negative electrode material for a high-capacity lithium ion battery of the present invention, comprising the following steps:
[0041] (1) Add 0.5 g of nano-silicon particles with a particle size of 8 nm into 200 ml of methanol and carry out ultrasonic dispersion for 120 minutes to obtain a nano-silicon dispersion liquid, and add 2 g of natural graphite with a particle size of 5 μm to the dispersion liquid under continuous stirring for mixing. Stir, the stirring time is 120 minutes, then add 3.57g of phenolic resin to the dispersion and continue to mix and stir for 30 minutes, the obtained mixed solution is evaporated to dryness in a water bath and vacuum baked at 120°C for 4 hours to obtain a silicon-carbon composite material precursor;
[0042] (2) calcining the silicon-carbon composite material precursor obtained in step (1) at 750° C. for 6 hours under argon protection, and then grinding to obtain a nano-sili...
Example Embodiment
[0046] Example 3
[0047] A method for preparing a silicon-based negative electrode material for a high-capacity lithium ion battery of the present invention, comprising the following steps:
[0048] (1) Add 0.5 g of nano-silicon particles with a particle size of 280 nm to 100 ml of N-methylpyrrolidone for ultrasonic dispersion for 40 minutes to obtain a nano-silicon dispersion, and add 10 g of artificial silicon with a particle size of 18 μm to the dispersion under continuous stirring The graphite was mixed and stirred for 30 minutes, and then 1.4 g of asphalt powder was added to the dispersion liquid and continued to be mixed and stirred for 45 minutes. The obtained mixed solution was evaporated to dryness in a water bath and vacuum-baked at 80°C for 12 hours to obtain a silicon-carbon composite precursor. body;
[0049] (2) calcining the silicon-carbon composite material precursor obtained in step (1) at 950° C. for 12 hours under argon protection, and then grinding to obt...
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