Waste lithium battery positive electrode material and current collector separating method

A technology for waste lithium batteries and positive electrode materials, which is applied in the field of separation of waste lithium battery positive electrode materials and current collectors, can solve the problems of high energy consumption, large investment in equipment, toxic fluorine-containing gases, etc., and achieve low energy consumption, small investment in equipment, The effect of low firing temperature

Inactive Publication Date: 2017-08-18
孙志廷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-temperature roasting requires high energy consumption, large investment in equipment, and produces toxic fluorine-containing gases, so the existing process needs to be modified

Method used

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Embodiment Construction

[0014] The method for separating the positive electrode material of the waste lithium battery from the current collector is characterized in that it comprises the following steps: (1) putting the waste positive electrode sheet into a pulverizer to crush it to 200-300 mesh, and putting it into a rolling vibration mill drum Inside, keep the positive electrode material powder evenly distributed along the axis of the drum, after vacuuming, fill it with inert gas, return to normal pressure, roll and grind to micron level; (2) Add defluorinating agent to step (1) and put it in high temperature Burn in the furnace at 280°C for 3-5 hours, sieve and remove the defluorinating agent to obtain the mixed powder; (3) Put the mixed powder in step (2) into the gas separator to recover the positive electrode material by the method of different specific gravity.

[0015] The waste positive electrode sheet described in step (1) refers to the leftovers or discarded positive electrode sheet produce...

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Abstract

The invention discloses a waste lithium battery positive electrode material and current collector separating method. The method is characterized by comprising the following steps of (1) putting waste positive electrode pieces into a pulverizer and pulverizing the waste positive electrode pieces to the size of 200-300 meshes, then putting the pulverized sheets into a roller of a rolling-and-vibrating mill, keeping the positive electrode material powder distributed evenly along the axis of the roller, drawing the air out to form a vacuum state and then introducing an inert gas to restore to a normal pressure, and rolling and grinding the powder to a micron level; (2) adding a de-fluorination agent into the micron level powder obtained in step (1), putting the micron level powder into a high-temperature furnace and burning the micron-level powder at 200-300 DEG C for 3-5 hours, and removing the de-fluorination agent by sieving to obtain a mixed powder; and(3) putting the mixed powder obtained in step (2) in a gas separator and recovering the positive electrode material. Compared with prior art, the method disclosed by the invention has the characteristics of low calcination temperature, low energy consumption, small equipment investment, simple process and high separating efficiency; and the method can be put into production use directly without follow-up operations, and cost is saved and production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of recycling lithium battery cathode materials, in particular to a method for separating waste lithium battery cathode materials from current collectors. Background technique [0002] Lithium-ion batteries have been commercialized since 1990 and have been widely used in video cameras, mobile phones, notebook computers, and portable measuring instruments. Generally, after hundreds of times of charge and discharge of the battery (after 2-3a use), the electrode will expand, the capacity will be greatly reduced, and it will be scrapped. In addition, the scrap rate of large battery companies in my country is generally about 1%-3%, and the scrap rate of small and medium-sized battery companies is even higher. During the production of positive electrode sheets, after rolling, slitting, sheeting, and winding, scraps and electrode sheets will be scrapped, and battery companies often sell them directly as waste produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 孙志廷
Owner 孙志廷
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