Method for recovering Li and Co in lithium battery positive electrode material by utilizing polyethylene glycol dicarboxylic acid

Abstract

The invention relates to a method for recovering Li and Co in a lithium battery positive electrode material by using polyethylene glycol dicarboxylic acid. The method specifically comprises the following steps of mixing the polyethylene glycol dicarboxylic acid with the lithium battery positive electrode material, heating to carry out a complexation reaction, adding a cobalt precipitant after the reaction is completed, adding a lithium precipitant, and carrying out solid-liquid separation to obtain a solid containing Li and Co. According to the method, the polyethylene glycol dicarboxylic acid is used as a metal recovery agent to extract the Li, the Co and other metal elements, the reaction conditions are mild, high temperature and high pressure are not involved, consumed time is short, the metal recovery rate is high, other toxic and harmful substances are not introduced, the polyethylene glycol dicarboxylic acid can be recycled, and the method is environmentally friendly, easy to operate, easy to control, low in cost, and suitable for large-scale production operation.

Description

technical field [0001] The invention belongs to the technical field of processing non-ore raw materials (such as waste materials) to produce non-ferrous metals or their compounds, and relates to a method for recovering Li and Co in lithium battery cathode materials by using polyethylene glycol dicarboxylic acid. Background technique [0002] In recent years, lithium-ion batteries have been widely used in electrochemical power sources, mobile electronic devices, and electric vehicles due to their high energy density and power density. Typical lithium-ion battery electrodes include lithium metal oxide cathode materials and graphite anode materials, and the mainstream cathode active material is LiCoO 2 , The doping of Ni, Mn, Al and other ions can reduce the cost of lithium-ion battery cathode materials to a certain extent. The mass percentage of Li and Co in waste lithium-ion batteries can reach 10-30%. In recent years, with the rising price of Co raw materials, it is particu...

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Problems solved by technology

The recovery rate of hydrometallurgy is high, but it involves a lot of complicated pretreatment, the inorganic acid used is highly corrosive, requires a complicated post-separation process, and will release a large amount of Cl 2 , SO x , NO x Gases that are harmful to the air; organic acids generally cannot be used alone in thermal metallurgical methods, and need to add an appropriate amount of co-reducing agent to play a role, so thermal metallurgical methods are highly dependent on raw materials; while biodegradation technology has a low recovery rate and a relatively complicated process