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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  • 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 remo

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
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Example Embodiment

[0035] Example 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 electrode sheet into the sintering furnace, and pass 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: heating the sintering furnace, the heating rate is 1 °C per minute, the heating time is 6 hours, and the temperature is kept at 360 °C for 6 hours to obtain calcined waste pole pieces.

[0039] Step D, vibrating separation: put the calcined waste electrode pieces into the 5-purpose vibrating screen in batches, add 1 kilogram of steel balls with different particle sizes between 5-15 mm in diameter simultaneously, and vibrate. Sifting and rapping at a frequency of 60 beats p...

Example Embodiment

[0041] Example 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 make them loose.

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

[0044] Step C, calcining: heating the sintering furnace, the heating rate is 3 °C per minute, the heating time is 2.72 hours, and the temperature is kept at 490 °C for 1 hour to obtain calcined waste pole pieces.

[0045] Step D, vibrating separation: put the calcined waste electrode pieces into a 50-purpose vibrating screen in batches, add 2 kilograms of steel balls with different particle sizes between 5-15 mm in diameter simultaneously, and vibrate. The rapping frequency is 90 beats per minute, and the aluminum foil and lithium iron phosphate waste powd...

Example Embodiment

[0047] Example 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 make them loose.

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

[0050] Step C, calcining: heating the sintering furnace, the heating rate is 6 °C per minute, the heating time is 1 hour, and when the temperature reaches 360 °C, the temperature is kept for 3 hours to obtain calcined waste pole pieces.

[0051] Step D, vibrating separation: put the calcined waste electrode sheets into the 5-purpose vibrating screen in batches, add 3 kilograms of steel balls with different particle sizes between 5-15 mm in diameter simultaneously, and vibrate. The rapping frequency is 120 beats per minute, and the aluminum foil and lithi...

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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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