Preparation method of lithium ion battery positive electrode slurry
A lithium-ion battery and positive electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problem of large specific surface area of high-performance graphene composite conductive paste, affecting the health of workers in the production workshop, and the toxicity of the production site Large and other problems, to achieve the effect of improving high-power start-up performance, reducing ohmic internal resistance and polarization internal resistance, and good dispersion
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[0021] The preparation method of lithium ion battery cathode slurry of the present invention may comprise the following steps:
[0022] S1. Mix high-performance graphene composite conductive paste, water-based binder and deionized water, stir and glue, to obtain mixed paste.
[0023] Among them, the water-based binder is made of water-based glue made of acrylonitrile multi-polymer, in which the acrylonitrile multi-polymer is used as a solute, and its content accounts for 16% by weight of the total amount of the water-based glue. The conductivity of the added deionized water is less than or equal to 1 μs / cm, and the amount of the added deionized water is such that the solid content of the obtained mixed slurry is 45-65 wt%. The revolution of stirring and beating is 20~30rmp, and the speed of dispersion is 2500~4000rmp. Stirring time 60 ~ 120min.
[0024] S2. Kneading and stirring the lithium manganate and the conductive agent to obtain a mixed powder. The revolution of knead...
Embodiment 1
[0033] (1) Mix 1041.6g of water-based adhesive ADY-701A (solid content: 16wt%), 485g of water as a solvent, and 1587g of high-performance graphene composite conductive paste (solid content: 6.3wt%), and put it in Guangzhou Senhong The mixer stirs for 100min at a revolution speed of 25rpm / min and a dispersion speed of 2500rpm / min; the measured viscosity is 3500mPa·s.
[0034] (2) Add 3000g of lithium manganate active material and 66.6g of conductive agent SP into the Guangzhou Senhong mixer and stir for 180min at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min.
[0035] (3), then add (1) the well-stirred glue into (2) the kneaded powder for two stages of adding and stirring: first add (1) 20% of the weight of the glue, a total of 622.9g, Stir the slurry at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min for 30min to achieve a pre-dispersed mud-like effect, then add (1) 80% of the weight of the glue solution, a total of 2491.5g, at a r...
Embodiment 2
[0038] (1), mix 815.2gADY-701A (solid content is 16wt%), 385.3g water as solvent, 1294g high-performance graphene composite conductive paste (solid content is 6.3wt%), put into Guangzhou Senhong mixer to Revolution speed 25rpm / min, dispersion speed 2500rpm / min and stir for 100min; measured viscosity was 3400mPa·s.
[0039] (2) Add 3000g of lithium manganate active material and 48.9g of conductive agent SP into the Morihiro mixer and stir for 180min at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min.
[0040] (3) Add (1) the stirred glue into the above (2) kneaded powder for two stages of addition and stirring: first add (1): 20% of the weight of the glue, a total of 499g, Stir the slurry at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min for 30min to achieve a pre-dispersed mud-like effect, then add (1) 80% of the weight of the glue 1995.6g at a revolution speed of 50rpm / min and a dispersion speed of 3000rpm / min high-speed stirring...
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