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Positive electrode conductive coating for reducing extension of rolled pole piece and preparation method thereof
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A technology of conductive coating and pole piece, applied in electrode collector coating, electrode manufacturing, circuit and other directions, can solve the problem of no improvement of positive pole piece rolling, achieve industrialized operation, strengthen anti-deformation ability, preparation method simple effect
Active Publication Date: 2020-07-10
江苏海基新能源股份有限公司
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[0005] Chinese patent CN 108511689A discloses a lithium-ion battery positive electrode sheet containing a conductive coating and its preparation method. In this invention, a special conductive coating is coated on the current collector, and the conductive coating is cured by conductive paste. Its conductive paste includes: composite carbon source, binder, dispersant, organic solvent, and its conductive coating can greatly improve the adhesion of the pole piece and enhance the conductivity, but it does not improve the roll pressure of the positive pole piece.
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Embodiment 1
[0032] A positive electrode conductive coating that reduces the extension of rolled pole pieces, the conductive coating is formed by curing conductive paste, and the conductive paste includes conductive graphite KS-6, single-wall carbon nanotubes, Ketjen black, PVAc Emulsion, PTFE emulsion and deionized water are prepared.
[0033] Wherein, the amount of conductive graphite KS-6 is 1wt% of the solvent amount.
[0034] Ketjen black consumption is 1wt% of solvent consumption.
[0036] The solid content of the PTFE emulsion is 20wt%, and the consumption is 30wt% of the solvent consumption.
[0037] The solid content of the PVAc emulsion is 54wt%, and the consumption is 10wt% of the solvent consumption.
[0038] A method for preparing a positive electrode conductive coating that alleviates the extension of rolled pole pieces, comprising the...
Embodiment 2
[0046] A positive electrode conductive coating that reduces the extension of the rolled pole piece, the conductive coating is formed by curing a conductive paste, and the conductive paste includes graphene, single-walled carbon nanotubes, Ketjen black, PVAc emulsion, PTFE emulsion and deionized water.
[0047] Wherein, graphene consumption is 1wt% of solvent consumption.
[0048] Ketjen black consumption is 1.5wt% of solvent consumption.
[0049] The solid content of the single-walled carbon nanotube water dispersion is 1wt%, and the dosage is 1wt% of the solvent dosage.
[0050] The solid content of the PTFE emulsion is 20wt%, and the consumption is 50wt% of the solvent consumption.
[0051] The solid content of the PVAc emulsion is 54wt%, and the consumption is 15wt% of the solvent consumption.
[0052] A method for preparing a positive electrode conductive coating that alleviates the extension of rolled pole pieces, comprising the following steps:
[0053] (1) Add 1.5Kg...
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technical field [0001] The invention belongs to the technical field of lithiumion batteries, and in particular relates to a positive electrode conductive coating for reducing the extension of rolled pole pieces and a preparation method thereof. Background technique [0002] In recent years, lithiumiron phosphate power batteries have been favored by lithium battery experts around the world due to their absolute safety and reliability, long cycle life, and stable discharge platform, and have achieved rapid development. However, lithium iron phosphate as the positive active material The conductivity is poor, so when preparing the positive electrode sheet, a layer of 1-2 μm conductive coating is generally pre-coated on the surface of the aluminum foilcurrent collector to promote electronic conduction between the active material coating and the aluminum foilcurrent collector. [0003] The existing positive electrode primer conductive coating is generally composed of an organi...
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