Silicon-based negative electrode composite material and lithium secondary battery
A lithium secondary battery and composite material technology, which is applied in the direction of lithium batteries, negative electrodes, battery electrodes, etc., can solve the problems of low rate performance and large volume expansion of silicon-based negative electrodes, and achieve high capacity, high rate, and increased conductivity Effect
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Embodiment 1
[0052] (1) Mix metal silicon powder, metal magnesium powder, and silicon dioxide powder evenly according to the molar ratio of 2:1:1, and place them in a high-temperature furnace;
[0053] (2) Sinter the mixture for 2 hours at 1200°C under a nitrogen protective atmosphere, and after cooling, crush and sieve;
[0054] (3) The sieved sample was mixed with glucose at a mass ratio of 20:1, placed in a high-temperature furnace, and heat-treated at 900°C for 2 hours in a nitrogen atmosphere to obtain a carbon-coated magnesium-doped silicon-based negative electrode; its SEM image is as follows figure 2 shown. It can be seen from the figure that the prepared silicon-based negative electrode has potato-like micron-sized particles.
[0055] (4) The carbon-coated magnesium-doped silicon-based negative electrode, conductive carbon black SP, and sodium carboxymethylcellulose (CMC) were prepared in a ratio of 7:2:1 to prepare negative electrode slurry, which was prepared after coating and...
Embodiment 2
[0060] (1) Disperse and ball mill the silicon oxide powder in a mixed solvent of ethanol and water (volume ratio 1:2) for 1 hour, add magnesium oxide powder according to the molar ratio of 2:1, and continue ball milling for 2 hours;
[0061] (2) Centrifuging and drying the slurry after ball milling;
[0062] (3) Place the dried precursor in a rotary furnace, pass a mixed gas of argon and methane with a volume ratio of 3:1 at 1000°C, and keep it warm for 2 hours to obtain a carbon-coated magnesium-doped silicon substrate. negative electrode;
[0063] (4) The carbon-coated magnesium-doped silicon-based negative electrode, conductive carbon black SP, and sodium carboxymethylcellulose (CMC) were prepared in a ratio of 7:2:1 to prepare negative electrode slurry, which was prepared after coating and drying Negative pole piece, with the positive material lithium cobalt oxide LCO as the counter electrode, assembled into a button battery in the glove box, charged it, and evaluated the...
Embodiment 3
[0066] (1) Mix metal silicon powder, alumina powder, and silicon dioxide powder evenly in a molar ratio of 2:1:1, and place them in a vacuum furnace;
[0067] (2) At 900°C, the mixture was heat-treated for 2 hours under vacuum, and after cooling, it was crushed and sieved;
[0068] (3) Mix the sieved sample with petroleum pitch at a mass ratio of 20:1, place in a high-temperature furnace, and heat-treat at 900° C. for 2 hours in a nitrogen atmosphere to obtain a carbon-coated aluminum-doped silicon-based negative electrode;
[0069] (4) Prepare the negative electrode slurry with the carbon-coated aluminum-doped silicon-based negative electrode, conductive carbon black SP, and sodium carboxymethyl cellulose (CMC) at a ratio of 7:2:1, and make it after coating and drying Negative pole piece, with the ternary positive material nickel cobalt lithium manganate NCM333 as the counter electrode, assembled into a button battery in a glove box, charged it, and evaluated the electrochemi...
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