Lithium-ion power cell aqueous sizing agent and manufacturing method thereof
A power battery and water-based slurry technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., to achieve the effects of improving the manufacturing performance of pole pieces, reducing manufacturing costs, and improving performance
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[0029] Example 1
[0030] Accurately weigh 50.00kg of lithium iron phosphate, 0.94kg of flake graphite, 1.50kg of acetylene black, and 0.024kg of lithium sulfite into a "V" mixer and mix for 30 minutes. Weigh 50kg of deionized water, heat it to 90°C, add 1.20kg of nitrile rubber and 1.00kg of styrene-butadiene rubber, stir until completely dissolved and vacuum until there are no bubbles in the rubber. Then add the pre-mixed powder to the prepared glue in 4 times, stir until uniform, adjust the viscosity, and vacuum. After the filtered slurry is coated, rolled and sheeted, a positive electrode sheet is prepared.
[0031] To prepare the same weight of oily slurry, 45Kg-50Kg of NMP (N-pyrrolidone) is required.
Example Embodiment
[0032] Example 2
[0033] Accurately weigh 50.00 kg of negative electrode graphite, 0.53 kg of acetylene black, and 0.045 kg of lithium tetraborate, and place them in a "V" mixer for 30 minutes. Weigh 50 kg of deionized water, heat it to 90°C, add 1.20 kg of nitrile rubber and 1.00 kg of butyl rubber, stir until all is dissolved and vacuum until there are no bubbles in the rubber. Then add the pre-mixed powder to the prepared glue in 4 times, stir until uniform, and vacuum. After the filtered slurry is coated, rolled and sheeted, a negative electrode sheet is prepared.
[0034] The pole pieces prepared in Example 1 and Example 2 were made into 7Ah batteries by adding diaphragms, and sealed with liquid, left standing and activated. The activation system is: 0.01C charging for 6 hours, then 0.02C charging 6 After hours, switch to constant voltage charging for 8 hours, and the constant voltage is 3.0V.
Example Embodiment
[0035] Example 3
[0036] Accurately weigh 50.00kg of lithium iron phosphate, 0.94kg of flake graphite, 1.50kg of acetylene black, and 0.024kg of lithium fluoride into a "V" mixer and mix for 30 minutes. Weigh 50 kg of deionized water, heat it to 90°C, add 1.00 kg of polyvinyl acetate and 1.30 kg of styrene butadiene rubber, stir until all is dissolved and vacuum until there are no bubbles in the glue. Then add the pre-mixed powder to the prepared glue in 4 times, stir until uniform, and vacuum. After filtration, an aqueous positive electrode slurry is obtained.
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