Method and device for recycling and harmlessly treating waste lithium ion battery electrolyte

Abstract

The invention discloses a method and a device for recycling and harmlessly treating waste lithium ion battery electrolyte. The method comprises the following steps: step I, adequately discharging a waste lithium ion battery, and collecting cells; step II, placing a reaction tank with a solvent onto a magnetic heating stirrer, and carrying out the water-bath heating at the temperature of 50 to 90 DEG C; and step III, soaking the cells in the solvent; step IV: dropwise adding little water into a reaction solution, simultaneously adding lithium phosphate, controlling the stirring speed to be at 200 to 800r / min in the reaction process, wherein the reaction time lasts for 0.5 to 6 hours, generating a solution containing lithium difluorophosphate, introducing inert gas into the reaction tank, generating hydrogen fluoride in the reaction process, absorbing hydrogen fluoride by virtue of an absorption device, and recycling a process product-lithium fluoride by virtue of filtering. By adopting the method and the device, electrolyte salt and an organic solvent resource can be effectively recycled, the resource configuration can be optimized, the reutilization of the resources can be promoted, and energy can be saved.

Description

technical field [0001] The invention relates to the fields of lithium ion battery recovery, utilization and recovery of renewable resources, in particular to a method for resource utilization and harmless treatment of waste lithium ion battery electrolyte, and a device using the method. Background technique [0002] Lithium-ion batteries are widely used in portable computers, mobile phones, digital equipment, power tools and other fields due to their outstanding advantages such as high working voltage, high specific energy, high output power, long life, and good portability. on new energy electric vehicles. With the continuous mass production and use of lithium-ion batteries, the problem of how to deal with waste lithium-ion batteries will become increasingly urgent. Although Li-ion batteries are regarded as green power sources, they use toxic and flammable organic electrolytes such as lithium hexafluorophosphate (LiPF 6 ). Lithium hexafluorophosphate has poor thermal sta...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a resource utilization and harmless treatment method for waste lithium-ion battery electrolyte, which effectively solves the technical bottlenecks of vacuum sealing, low-temperature freezing, and high pressure in the current extraction process of lithium hexafluorophosphate, and subsequent recovery There are disadvantages such as complicated process, and there will be no secondary pollution to the environment during the entire recycling process, which optimizes resource allocation, promotes secondary utilization of resources, and saves energy.

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