Method for preparing coated carbon aluminum foil of lithium-ion battery current collector by employing metallurgical coke powder as raw material

Abstract

The invention discloses a method for preparing coated carbon aluminum foil of a lithium-ion battery current collector by employing metallurgical coke powder as a raw material. The method comprises the steps of pulverizing large-grained metallurgical coke powder of which the particle sizes are smaller than or equal to 3mm into the powder of which the particle sizes are 1-10 microns; adding an acid liquid to the metallurgical coke powder for primary acidolysis, putting the liquid into a hydrofluoric acid solution for secondary acidolysis, and sequentially putting the solution into an alkali solution and deionized water for washing and filtering; mixing the filtered metallurgical coke powder and a grinding aid for ultrafine ball-milling for 5-10 hours until the particle sizes of the metallurgical coke powder are 20-50nm; carrying out drying and slurry mixing; and uniformly coating aluminum foil with slurry to obtain the coated carbon aluminum foil of the lithium-ion battery current collector. The particles of the metallurgical coke powder are refined to the maximum extent by adopting an ultrafine ball-milling technology; the contact area of the coke powder particles and the current collector is increased; and the electric property of a lithium-ion battery is significantly improved. The method has the advantages that: on one hand, the manufacturing cost of the coated carbon aluminum foil of the lithium-ion battery current collector is reduced, and on the other hand, a new way is opened up for high added value utilization of the metallurgical coke powder.

Description

technical field [0001] The invention belongs to the field of preparation of current collectors for lithium-ion batteries, and in particular relates to a method for preparing carbon-coated aluminum foils for lithium-ion battery collectors by using metallurgical coke powder as a raw material. Background technique [0002] With the country's strong support and guidance for new energy vehicles, new energy vehicles have achieved rapid development, which is related to the surge in demand for lithium-ion power batteries, and at the same time put forward higher requirements for the performance of lithium-ion batteries In this context, reducing cost and improving performance are the development goals of the lithium-ion battery industry. One of the ways to improve the performance is to increase the contact area between the current collector and the active particles to improve the electron transfer ability during the charging and discharging process of the lithium-ion battery, thereby ...

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Problems solved by technology

[0003] Compared with the booming development trend of the lithium battery industry, the former manufacturing giant iron and steel enterprises have continued to slump for many years, facing many problems such as overcapacity, environmental pollution, waste of resources, etc., especially in the utilization of metallurgical solid waste, such as Gas sludge from ironmaking process, dust sludge from steelmaking process, metallurgical coke powder from coking and quenching process, etc., although most enterprises are also recycling on-site, most of them are piled up in large quantities due to poor results. low value-added utilization such as disposing or paving roads, resulting in waste of resources and pollution of the environment

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