Positive electrode slurry and preparation method thereof
A technology of positive electrode slurry and positive active material, applied in the direction of electrode manufacturing, battery electrode, electrode collector coating, etc., can solve the problems of fast attenuation and poor cycle effect
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[0049] The present invention also provides an embodiment, which is to prepare the positive electrode slurry provided by the present invention through the following steps:
[0050] In the first step, the positive electrode active material is mixed with a part of conductive carbon powder to form a powder mixture 1;
[0051] In the second step, after ammonium fluoride and oxalic acid are mixed with deionized water, carboxymethyl cellulose is added to form a CMC-water solution;
[0052] The third step is to mix the CMC-water solution with another part of the conductive carbon powder to obtain the slurry 1 and then mix the powder mixture 1 with the slurry 1 to obtain the slurry 2
[0053] In the fourth step, the butadiene rubber is mixed with the slurry 2 to obtain the positive electrode slurry.
[0054] There is no sequence requirement between the first step and the second step above, and they can be performed simultaneously.
[0055]The conductive carbon powder in the above-men...
Embodiment 1-3
[0077] Aqueous cathode treatment
[0078] 80 grams of cathode material (Li 1+ Ni a co b mn c W e o 2 ) and 2.4 conductive carbon powder (superP, Imerys Graphite & carbon) to form a uniform powder mixture; dissolved in 66 g of deionized water with 0.32 g of ammonium fluoride and 0.12 g of oxalic acid, stirred for 20 minutes, and then added 1.45 g of carboxymethyl Cellulose (CMC) (Carboxymethyl cellulose) (MAC350HC, NIPPON PAPER INDUSTRIES CO., LTD.) was stirred overnight to form a CMC-water solution. Then the positive electrode material powder mixture was added to the CMC-water solution, and 1 milliliter of NMP (N-methylpyrrolidone) (MTI company) was added and mixed for 8 hours to form a slurry, and 4.23 grams of styrene-butadiene rubber suspension SBR (Styrene Butadiene Rubber) was added ( TRD202A, 40% suspension, JSR company), and stirred for 1 hour. The slurry was applied to the aluminum foil current collector with a knife coater to form a thin wet film. The coated e...
Embodiment 4
[0081] NMP-based cathode coating treatment
[0082] 25 grams of cathode material (Li 1+ Ni a co b mn c W e o 2 ) and 1.20 g of conductive carbon powder (superP, Imerys Graphite & carbon) were mixed to form a homogeneous powder mixture. 1.085 g of polyvinylidene fluoride PVDF (MTI) was mixed with 25 ml of NMP (N-methylpyrrolidone) (MTI) and stirred overnight to form a PVDF-NMP solution. The powder mixture was then added to the PVDF-NMP solution and mixed for 8 hours to form a slurry. The slurry was applied to the aluminum foil current collector with a knife coater to form a thin wet film. The coated electrodes were dried under vacuum at 120 °C for 6 hours to remove NMP.
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