Electrolyte used for waste lithium battery discharge, and waste lithium battery discharge method

Abstract

The invention discloses an electrolyte used for waste lithium battery discharge, and a waste lithium battery discharge method. The electrolyte contains copper sulfate and the concentration of copper sulfate is 0.1-1mol / L; the electrolyte also contains ascorbic acid; and the discharge method comprises a step that a waste lithium battery is immersed in the electrolyte until the voltage tends toward stability. The electrolyte used for waste lithium battery discharge is obtained through a large amount of experiments and researches by the inventors of the invention, and has the advantages of safety, environmental protection, high discharge efficiency, no precipitation of the above solution in the discharge process, and no dissolving loss of the shell of the battery. The waste lithium ion battery discharge method has the advantages of simple technology, easy operation, and suitableness for the industrial application.

Description

technical field [0001] The invention relates to the field of electrolytes, in particular to an electrolyte and a discharge method for discharging waste lithium batteries. Background technique [0002] With the widespread application of lithium-ion batteries, a large number of waste lithium-ion batteries have been produced. At present, waste lithium-ion batteries contain a large amount of toxic rare metal cobalt, but because cobalt is an important strategic metal, the current comparison of waste lithium-ion batteries Research on ion batteries mostly focuses on the recovery and reuse of precious metals. For example, the current ternary lithium batteries also contain precious metals such as manganese and nickel. At the same time, lithium-ion batteries also contain valuable metals such as aluminum and copper. However, in the process of dissipating the waste lithium-ion batteries in batches (i.e. releasing the residual power inside the waste lithium-ion batteries), due to the pro...

AI Technical Summary

Problems solved by technology

However, in the process of dissipating the waste lithium-ion batteries in batches (i.e. releasing the residual power inside the waste lithium-ion batteries), due to the process of short circuit and fragmentation during the decomposition process, the residual power of the batteries will be released sharply, causing local overheating and even explosion. Therefore, waste lithium-ion batteries must be fully discharged before recycling, and waste lithium-ion batteries must be de-energized.

[0003] At present, there are mainly two methods for the safe discharge of waste lithium-ion batteries. One is physical discharge, which mainly uses an external load to dissipate electricity, that is, the battery is connected to a resistor, and the power in the battery is consumed through heat release. However, this method It is only a laboratory test, and large-scale discharge is not feasible; the other is chemical discharge, that is, using the positive and negative metals of the battery as the cathode and anode, and consuming the residual electricity in the battery through the electrolysis process in the solution. The sodium chloride solution is used as the electrolyte, and the waste lithium-ion battery is used as the power source to discharge. This method is simple and feasible, but because chlorine gas will be precipitated at the anode when the sodium chloride solution is discharged, on the one hand, it will corrode the electrode and pollute the electrolyte system, and at the same time, it will affect the work of the operator. The environment also has an impact, and it will also lead to the dissolution loss of the battery case and the resulting recovery of the dissolved products.

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