Nano silicon alloy based composite negative pole material and preparation method thereof
A technology of negative electrode material and alloy material, which is applied in the field of nano-silicon alloy-based composite negative electrode material and its preparation, can solve the problem of battery cycle performance decline and the like, achieves damage prevention, simple and easy method, good cycle performance and high current discharge capacity Effect
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Embodiment 1
[0029] (1) According to the nano-silicon alloy as Si 1 sn0.5 Ni 0.1 The ratio of each atom, the raw material powders of Si, Sn, M and ball milling beads are added to the ball mill, and the inert gas is introduced into the ball mill to form a nano-silicon alloy material. The ball milling time is 80h, and the ball milling speed is 800rpm;
[0030] (2) Mix the nano-silicon alloy material and nano-carbon material obtained in step (1) with a mass ratio of 1:1 and add them to an ultrasonic machine, add a polyvinyl alcohol solution with a concentration of 10 mM / L, and ultrasonically disperse for 40 minutes. Mix to form a uniformly dispersed mixed powder slurry, add the mixed powder slurry and ball milling beads to the ball mill, mill for 40 minutes, centrifuge, filter, and wash to obtain the mixture; treat the mixture at high temperature for 2 hours under a nitrogen protection atmosphere, and the reaction temperature is 900 ℃ to obtain a nano-silicon alloy coated with a nano-carbon ...
Embodiment 2
[0035] (1) According to the nano-silicon alloy as Si 2 sn 1 Zn 0.2 The ratio of each atom, the raw material powders of Si, Sn, M and ball milling beads are added to the ball mill, and the inert gas is introduced into the ball mill to form a nano-silicon alloy material. The ball milling time is 60h, and the ball milling speed is 1200rpm;
[0036] (2) Mix the nano-silicon alloy material and nano-carbon material obtained in step (1) with a mass ratio of 2:1 and add them to an ultrasonic machine, add a solution of polyvinylpyrrolidone with a concentration of 8 mM / L, and disperse them ultrasonically for 20 minutes. Mix to form a uniformly dispersed mixed powder slurry, add the mixed powder slurry and ball milling beads to the ball mill, mill for 60 minutes, centrifuge, filter, and wash to obtain the mixture; treat the mixture at high temperature for 3 hours under a nitrogen protection atmosphere, and the reaction temperature is 700 ℃ to obtain a nano-silicon alloy coated with a n...
Embodiment 3
[0041] (1) Nano silicon alloy is Si 3 sn 1 Mu 0.5 The ratio of each atom, the raw material powders of Si, Sn, M and ball milling beads are added to the ball mill, and the inert gas is introduced into the ball mill to form a nano-silicon alloy material. The ball milling time is 20h, and the ball milling speed is 1500rpm;
[0042] (2) Mix the nano-silicon alloy material and nano-carbon material obtained in step (1) with a mass ratio of 3:1 and add them to the ultrasonic machine, and add hexadecyl trimethyl chloride at a concentration of 10 mM / L Ammonium solution, ultrasonically dispersed for 20 minutes, mixed to form a uniformly dispersed mixed powder slurry, the mixed powder slurry and ball milling beads were added to the ball mill, ball milled for 50 minutes, centrifuged, filtered, and washed to obtain a mixture; the mixture was treated at high temperature under a nitrogen protection atmosphere 4 hours, the reaction temperature is 500°C, and a nano-silicon alloy coated with ...
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