High-conductivity graphene/carbon nanotube composite coating for lithium ion batteries and preparation method thereof
A carbon nanotube composite, lithium-ion battery technology, applied in electrode current collector coating, battery electrode, conjugated diene coating and other directions, can solve the problems affecting the stability of the slurry and coating effect, to improve the Electrochemical performance, good stability, the effect of reducing the generation and transfer of heat
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Embodiment 1
[0022] A preparation method for a lithium-ion battery high conductivity graphene / carbon nanotube composite coating, comprising the steps of:
[0023] (1) Preparation of graphene oxide solution: graphene oxide was added to water for ultrasonic dispersion for 50 minutes to obtain graphite oxide floating liquid; the mass ratio of graphene oxide to water was 1:10;
[0024] (2) Preparation of nano-silicon solution: adding nano-silicon powder into N-methylpyrrolidone, and ultrasonically dispersing for 10 minutes to obtain nano-silicon solution; the mass ratio of nano-silicon powder to N-methylpyrrolidone is 1:6;
[0025] (3) the graphene oxide solution obtained in step 1 is mixed with the nano-silicon solution obtained in step 2, and ultrasonic 1h is obtained to obtain a uniform graphene oxide / nano-silicon mixed solution; the mass ratio of graphene oxide solution and nano-silicon solution is 20:5;
[0026] (4) Add carbon nanotubes to graphene oxide / nano-silicon mixed solution, ultr...
Embodiment 2
[0031] A preparation method for a lithium-ion battery high conductivity graphene / carbon nanotube composite coating, comprising the steps of:
[0032] (1) Preparation of graphene oxide solution: graphene oxide was added to water for ultrasonic dispersion for 60 minutes to obtain graphite oxide floating liquid; the mass ratio of graphene oxide to water was 5:20;
[0033] (2) Preparation of nano-silicon solution: adding nano-silicon powder into N-methylpyrrolidone and ultrasonically dispersing for 30 minutes to obtain nano-silicon solution; the mass ratio of nano-silicon powder to N-methylpyrrolidone is 3:10;
[0034] (3) the graphene oxide solution obtained in step 1 is mixed with the nano-silicon solution obtained in step 2, and ultrasonic 2h is obtained to obtain a uniform graphene oxide / nano-silicon mixed solution; the mass ratio of graphene oxide solution and nano-silicon solution is 30:8;
[0035] (4) Add carbon nanotubes to the graphene oxide / nano-silicon mixed solution, ...
Embodiment 3
[0040] A preparation method for a lithium-ion battery high conductivity graphene / carbon nanotube composite coating, comprising the steps of:
[0041] (1) Preparation of graphene oxide solution: graphene oxide was added to water for ultrasonic dispersion for 55 minutes to obtain graphite oxide floating liquid; the mass ratio of graphene oxide to water was 2:13;
[0042] (2) Preparation of nano-silicon solution: adding nano-silicon powder into N-methylpyrrolidone and ultrasonically dispersing for 18 minutes to obtain nano-silicon solution; the mass ratio of nano-silicon powder to N-methylpyrrolidone is 2:8;
[0043] (3) the graphene oxide solution obtained in step 1 is mixed with the nano-silicon solution obtained in step 2, and ultrasonic 2h is obtained to obtain a uniform graphene oxide / nano-silicon mixed solution; the mass ratio of graphene oxide solution and nano-silicon solution is 25:6;
[0044] (4) Add carbon nanotubes to graphene oxide / nano-silicon mixed solution, ultra...
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