Preparation and application of lithium battery silicon-carbon composite material taking synthetic graphite as carrier
A silicon-carbon composite material and artificial graphite technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor electrical conductivity, poor cycle stability, and large irreversible capacity loss, and achieve high production efficiency, high specific capacity, The effect of improving the first-time efficiency
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[0055] Example 1
[0056] (1) Preparation of lithium battery silicon-carbon composite anode material with artificial graphite as carrier:
[0057] (1) Dissolve 8.57g of nano-silicon (particle size of 50-200nm) in 100mL of absolute ethanol, add 0.1g of polyvinyl alcohol, and sonicate for 1h in an ultrasonic cleaner to obtain mixed solution A; the mass of mixed solution A The solid content is 10%;
[0058] (2) Completely dissolve 14.25 g of glucose into deionized water, and stir for 1 hour to obtain mixed solution B;
[0059] (3) Disperse 40 g of artificial graphite in 400 mL of absolute ethanol, and stir for 0.5 h to obtain mixed solution C;
[0060] (4) Slowly add the mixed solution A of step (1) and the mixed solution B of step (2) to the mixed solution C of step (3) at the same time, add absolute ethanol to make the solid content of the entire dispersion system 30%, and Rapidly (1000r / min) stirring for 1h to obtain mixed solution D; then the mixed solution D is dried by a...
Example Embodiment
[0066] Example 2
[0067] (1) Preparation of lithium battery silicon-carbon composite anode material with artificial graphite as carrier:
[0068] (1) Disperse 8.57g of nano-silicon (particle size of 50-200nm) in 100mL of absolute ethanol, add 0.2g of polyethyleneimine, and sonicate for 2h in an ultrasonic cleaner to obtain mixed solution A; The mass solid content is 10%;
[0069] (2) Dissolve 35.7 g of citric acid in 300 mL of absolute ethanol, and stir for 0.5 h to obtain mixed solution B;
[0070] (3) Disperse 40g of artificial graphite in 400mL of absolute ethanol, and stir for 2h to obtain mixed solution C;
[0071] (4) Slowly add the mixed solution A in step (1) and the mixed solution B in step (2) into the mixed solution C in step (3), add absolute ethanol to make the solid content of the entire dispersion system 15%, and quickly (800r / min) stirring for 3h to obtain the mixed solution D; then the mixed solution D is dried by a spray dryer under certain conditions to ...
Example Embodiment
[0082] Example 3
[0083] (1) Preparation of lithium battery silicon-carbon composite anode material with artificial graphite as carrier:
[0084] (1) Dissolve 8.57g of nano-silicon (particle size is 50-200nm) in 100mL of absolute ethanol, add 0.4g of nitrogen methyl pyrrolidone, and sonicate in an ultrasonic cleaner for 1.5h to obtain mixed solution A; mixed solution A The mass solid content of 10%;
[0085] (2) Dissolve 4.75 g of phenolic resin into 100 mL of absolute ethanol, and stir for 2 h to obtain mixed solution B;
[0086] (3) Dissolve 40 g of artificial graphite in 300 mL of absolute ethanol, and stir for 1 h to obtain mixed solution C;
[0087] (4) Slowly add the mixed solution A of step (1) and the mixed solution B of step (2) to the mixed solution C of step (3) at the same time, add absolute ethanol to make the solid content of the entire dispersion system 10%, and Rapidly (1200r / min) stirring for 5h to obtain mixed solution D; then the mixed solution D is dried ...
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