Method for recycling electrolyte of waste lithium ion battery

Abstract

The invention discloses a method for recycling the electrolyte of a waste lithium ion battery. The method mainly comprises the following steps of: collecting and cleaning the lithium ion battery; after discharge, putting the lithium ion battery in a drying room or a glove box under protection of inert gas; opening the battery, carefully taking out the electrolyte and placing in a material tank; performing high-vacuum decompressed rectification and separation to obtain the organic solvent contained in the electrolyte; performing rectification and purification for recycling; putting a rough product of lithium hexafluorophate into a dissolution kettle, and adding a hydrogen fluoride solution for dissolving the recycled lithium hexafluorophate; filtering the solution and then putting into a crystallization kettle for crystallization and purification; and screening, drying, packaging and recycling to obtain the product lithium hexafluorophate. The method has simple technology, is practical, efficient, clean and environment-friendly and easy to control, and realizes close integration of economic benefits and environmental social benefits.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery recovery, in particular to a method for recovering lithium hexafluorophosphate and a solvent from the electrolyte solution of waste lithium ion batteries. Background technique [0002] Since its commercialization in 1990, lithium-ion batteries have gradually replaced traditional secondary batteries and become the mainstream of the market due to their advantages such as high voltage, large capacity, and light weight, and are widely used in electronic products such as mobile phones, digital cameras, digital video cameras, and notebook computers. ground application. In 2000, the world's consumption of lithium-ion batteries was 500 million, and in 2008 it reached 2.8 billion. With the development of science and technology, the progress of the times, and the rapid development of the electric vehicle industry, people's demand for lithium-ion batteries has increased sharply . Lithium-ion ba...

AI Technical Summary

Problems solved by technology

These methods have the following disadvantages: 1) waste of raw materials, high energy consumption, low efficiency, and complicated process; 2) some power batteries are large in size, and are easy to catch fire and burn if not handled properly, which is more dangerous; 3) in the process of recycling electrode materials When dealing with the electrolyte, the lithium hexafluorophosphate contained in the electrolyte is decomposed to form fluorides, phosphorus compounds and lithium compounds, which are mixed with other metal ions. Subsequent processing is difficult and easy to cause environmental pollution

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