Method for recovering separator, copper foil and battery positive pole from waste lithium-ion power battery

Abstract

The invention discloses a method for recovering a separator, a copper foil and a battery positive pole from a waste lithium-ion power battery. The method comprises the following steps that (1) discharging of the waste lithium-ion power battery is performed at 15-40 DEG C, and the voltage of the waste lithium-ion power battery is reduced to 0.01-0.5V; (2) the battery after discharging is sheared and broken into a geometrically regular shape by using a shearing crusher; (3) the obtained regular battery fragments are immersed in water and stirred, and after stirring is performed, the regular battery fragments are sieved; (4) the obtained oversize product is placed in a gravity separator, the separator is separated from the copper foil and the battery positive pole, and the separator is recovered; and (5) the obtained copper foil and battery positive pole are dried and then placed in an eddy current separator to separate and recover the copper foil and the battery positive pole. The methodis easy in realization of industrialization, low in recovery cost and high in product recovery rate, and does not pollute the environment.

Description

technical field [0001] The invention relates to a method for recovering diaphragms, copper foils and positive electrodes of batteries from waste lithium-ion power batteries, and belongs to the technical field of comprehensive recovery of secondary resources. Background technique [0002] With the increasing shortage of global fossil resources and the urgent need for environmental protection, the development of electric vehicles to reduce resource consumption and reduce environmental pollution is gradually becoming a broad consensus. In recent years, the state has given great support to electric vehicles, which has led to a sharp increase in the production of electric vehicles. As of 2016, China has produced a total of 1.014 million new energy vehicles, and the market stock is close to 1 million. However, a large number of new energy vehicles that have been put into the market will inevitably bring about the problem of battery recycling after the end of life. According to re...

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Problems solved by technology

[0004] At present, the recycling process of waste lithium-ion power batteries is mainly for the recycling of positive electrode active materials, but the diaphragm is basically not recycled, resulting in waste of resources

For copper foil, it needs to be recovered after leaching and extraction. The subsequent recovery process is complicated. At the same time, copper impurities will be introduced during the leaching process, resulting in a lower purity of the final metal product.

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