Discharge method of waste lithium battery

Abstract

The invention provides a discharge method of a waste lithium battery. The discharge method comprises the following steps of: firstly, directly contacting a waste lithium battery with a sacrificial anode to obtain a pretreatment system, immersing the pretreatment system in a conductive salt solution for discharge, and finally, leading out the positive electrode and the negative electrode of the battery, respectively connecting the positive electrode and the negative electrode with copper sheets, putting the copper sheets into the conductive salt solution, measuring the voltage of the battery until the voltage value tends to be stable, and ending discharge. The sacrificial anode can stably exist in a neutral or alkaline solution, the influence of illumination, temperature and the like is small, and the discharge condition is easy to control; the sacrificial anode is preferentially oxidized and dissolved in the discharge process to prevent chlorine from being separated out, so that the problem of electrolyte leakage pollution is effectively solved; moreover, as the sacrificial anode corresponds to the positive ions of the conducting salt, the ion concentration of the conductive salt solution is increased after the sacrificial anode is dissolved, the cyclic utilization of the conductive salt solution can be realized while the discharge rate is increased, and the discharge cost is saved. The method is simple in process, easy to operate and suitable for large-scale application.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a safe discharge method for waste lithium batteries. Background technique [0002] This section is intended to provide a background or context for implementations of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] Due to its advantages of large specific capacity, high voltage, long life and no memory effect, the demand for lithium-ion batteries in the fields of electronic products and electric vehicles is increasing year by year. With the development of electric vehicles and hybrid electric vehicles, the demand for lithium-ion batteries at home and abroad is increasing year by year, and the life of lithium-ion batteries is generally 3 to 5 years, so a large number of waste batteries will be generated. Lithium-ion batteries contain many metal elements, volatile organic compoun...

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Problems solved by technology

However, the ascorbic acid used in this method is very unstable in neutral or alkaline solutions, is easily oxidized by light, and is also very susceptible to inactivation by temperature, pH and metal ions, especially Cu in this method. 2+ The oxidative deactivation of ascorbic acid has obvious catalytic effect. In order to make metal ions and ascorbic acid coexist stably, the discharge conditions must be strictly controlled, so it is difficult to achieve large-scale application

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