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Method for separating and recycling positive plates of waste lithium iron phosphate batteries

A lithium iron phosphate battery, separation and recycling technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve problems such as poor performance of lithium-ion batteries, failure to reach lithium iron phosphate products, complex process routes, etc. , to achieve the effect of maintaining toughness, low processing cost and reasonable process

Active Publication Date: 2019-08-02
ZHUZHOU SMELTER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the positive electrode material regenerated by pyrocalcination contains other impurity elements such as Al content is too high, which makes the performance of the regenerated lithium-ion battery poor.
Therefore, when choosing to use excess strong acid to completely leach the ions in the battery in the later hydrometallurgical treatment method, it is necessary to add a set of aluminum removal process, and it is difficult to completely remove Al. Although the leaching rate of Li is relatively high, the later stage needs A large amount of lye is used to neutralize the excess acid in the early stage, so the process route is complicated and the cost is increased; but for the direct fire repair process, because the Al content is too high, the repaired lithium iron phosphate product completely reaches Less than the requirements of the national standard for lithium iron phosphate products

Method used

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  • Method for separating and recycling positive plates of waste lithium iron phosphate batteries

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Step A, cutting: Cut the positive electrode sheet of the waste lithium iron phosphate battery into 20 cm long pieces or fragments, and at the same time separate the cut positive electrode sheet into loose shapes.

[0037] Step B, pretreatment: Put the waste pole pieces into the sintering furnace, and feed 99.95% argon gas into the sintering furnace, so that the oxygen concentration in the sintering furnace is 50 ppm, and the furnace pressure is 20 Pa.

[0038] Step C, calcining: heat up the sintering furnace at a rate of 1°C per minute for 6 hours, and keep it warm for 6 hours when the temperature reaches 360°C to obtain calcined spent pole pieces.

[0039] Step D, vibration separation: put the calcined waste pole pieces into a vibrating screen with a screen mesh of 5 meshes in batches, and add 1 kg of steel balls with different particle diameters between 5-15 mm in diameter at the same time to vibrate Sieve and vibrate at a frequency of 60 beats per minute to obtain alu...

Embodiment 2

[0042] Step A, cutting: Cut the positive electrode sheet of the waste lithium iron phosphate battery into 25 cm long pieces or fragments, and form them loosely.

[0043] Step B, pretreatment: Put the waste pole pieces into the sintering furnace, and feed 99.99% nitrogen gas into the sintering furnace, so that the oxygen concentration in the sintering furnace is 500ppm, and the furnace pressure is 120 Pa.

[0044] Step C, calcining: heat up the sintering furnace at a rate of 3°C per minute, the heating time is 2.72 hours, and keep the temperature for 1 hour when the temperature reaches 490°C to obtain the calcined spent pole piece.

[0045] Step D, vibration separation: put the calcined waste pole pieces into a vibrating screen with a mesh of 50 meshes in batches, and add 2 kg of steel balls with different diameters between 5-15 mm in diameter at the same time to vibrate Sieve and vibrate at a frequency of 90 beats per minute to obtain aluminum foil and lithium iron phosphate w...

Embodiment 3

[0048] Step A, cutting: Cut the positive electrode sheet of the waste lithium iron phosphate battery into 35 cm long pieces or fragments, and form them into loose shapes.

[0049] Step B, pretreatment: put the waste pole pieces into the sintering furnace, and inject 99.995% neon gas into the sintering furnace, so that the oxygen concentration in the sintering furnace is 1000ppm, and the furnace pressure is 300 Pa.

[0050] Step C, calcining: heat up the sintering furnace at a rate of 6°C per minute for 1 hour, and keep it warm for 3 hours when the temperature reaches 360°C to obtain calcined spent pole pieces.

[0051] Step D, rapping and separating: put the calcined waste pole pieces into a vibrating sieve with a screen mesh of 5 meshes in batches, and add 3 kilograms of steel balls with different diameters between 5-15 mm in diameter at the same time to vibrate. Sieve and vibrate at a frequency of 120 beats per minute to obtain aluminum foil and lithium iron phosphate waste ...

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Abstract

The invention relates to a method for separating and recycling positive plates of waste lithium iron phosphate batteries, which comprises the steps of firstly cutting the positive plates of the wastelithium iron phosphate batteries into loose segments, putting the segments into a sintering furnace for calcination in an insert atmosphere to obtain calcined waste plates, and vibrating and sieving the waste plates so as to obtain aluminum foil on a vibrating sieve and lithium iron phosphate waste powder below the vibrating sieve. According to the invention, a binder is enabled to lose effectiveness through the calcination under the protection of an inert gas, the toughness and non-oxidation of the aluminum foil are maintained at the high temperature, and the high leaching rate of Li in the later wet recycling process and the difficulty of removing Al in the process are ensured at the same time.

Description

technical field [0001] The invention relates to the field of recycling and utilization of waste positive plates of lithium iron phosphate batteries, in particular to a method for separating and recycling the positive plates of waste lithium iron phosphate batteries. Background technique [0002] Polyanionic material lithium iron phosphate (LiFePO 4 , often abbreviated as LFP) has the advantages of safety, environmental protection, good stability, high specific capacity, cheap price, etc., especially its stable structure and safe performance are suitable for large-scale power sources such as electric vehicles, and are considered as power It is an important candidate cathode material in batteries, power tools and energy storage batteries, and has been widely used. Therefore, the market potential of lithium iron phosphate batteries is very huge. [0003] With the soaring price of upstream materials in the process of power battery preparation, the industry has turned its atten...

Claims

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Application Information

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IPC IPC(8): H01M10/54C22B7/00C22B21/00C01B25/45
CPCH01M10/54C22B7/001C22B21/0069C01B25/45Y02W30/84Y02P10/20
Inventor 周玉琳廖贻鹏张桂海林文军刘敏王勇
Owner ZHUZHOU SMELTER GRP
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