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Vacuum separation method of waste lithium iron phosphate battery positive plate

A lithium iron phosphate battery, vacuum separation technology, applied in the direction of battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of unreachable lithium iron phosphate products, poor performance of lithium ion batteries, complicated process routes, etc. , to achieve the effect of low processing cost, no pollution and reasonable process

Active Publication Date: 2019-08-20
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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  • Vacuum separation method of waste lithium iron phosphate battery positive plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step A, cutting: Cut the positive electrode sheet of the waste lithium iron phosphate battery into 30 cm long pieces or strips, and separate them into loose pieces to obtain loose spent electrode sheets.

[0033] Step B, pretreatment: first put loose waste electrode pieces into the vacuum furnace, and then pump the vacuum furnace into a vacuum state, so that the vacuum degree of the vacuum furnace is 0.5.

[0034] Step C. Vacuum roasting: heat up the vacuum furnace at a rate of 12°C per minute for 30 minutes, and keep warm for 6 hours when the temperature reaches 350°C to obtain roasted spent pole pieces.

[0035] Step D, vibration separation: put the calcined waste pole pieces into a vibrating screen with a screen size of 5 mesh in batches, and add 1 kg of steel balls with different diameters between 5-15 mm in diameter for vibration Sieve to obtain aluminum foil and lithium iron phosphate waste powder respectively.

[0036]Through the separation and recovery of waste...

Embodiment 2

[0038] Step A, cutting: Cut the positive electrode sheet of the waste lithium iron phosphate battery into 35 cm long pieces or strips, and separate them into loose shapes.

[0039] Step B, pretreatment: first put loose waste electrode pieces into the vacuum furnace, and then pump the vacuum furnace into a vacuum state, so that the vacuum degree of the vacuum furnace is 0.7.

[0040] Step C. Vacuum roasting: heat up the vacuum furnace at a rate of 20°C per minute for 21 minutes, and keep it warm for 1 hour when the temperature reaches 420°C to obtain roasted spent pole pieces.

[0041] Step D, vibration separation: put the calcined waste pole pieces into a vibrating sieve with a screen mesh of 60 meshes in batches, and add 2 kg of steel balls with different diameters between 5-15 mm in diameter for vibration Sieve to obtain aluminum foil and lithium iron phosphate waste powder respectively.

[0042] Through the separation and recovery of waste lithium iron phosphate positive e...

Embodiment 3

[0044] Step A. Cutting: Cut the positive electrode sheet of the waste lithium iron phosphate battery into a length of 40 cm, and separate it into loose pieces.

[0045] Step B, pretreatment: first put loose waste electrode pieces into the vacuum furnace, and then pump the vacuum furnace into a vacuum state, so that the vacuum degree of the vacuum furnace is 0.9.

[0046] Step C. Vacuum roasting: heat up the vacuum furnace at a rate of 24° C. per minute for 15 minutes. When the temperature reaches 380° C., keep the temperature for 4 hours to obtain roasted spent pole pieces.

[0047] Step D, rapping separation: put the calcined waste pole pieces in batches into a vibrating sieve with a screen mesh of 100 mesh, and add 3 kilograms of steel balls with different particle diameters with diameters between 5-15 mm, and vibrate Sieve to obtain aluminum foil and lithium iron phosphate waste powder respectively.

[0048] Through the separation and recovery of waste lithium iron phospha...

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Abstract

A vacuum separation method of a waste lithium iron phosphate battery positive plate comprises the following steps: cutting the waste lithium iron phosphate battery positive plate into loose sheets, and putting the loose pole plates into a vacuum furnace for vacuum roasting at the temperature of 350-450 DEG C for 1-6 hours; putting the calcined waste pole sheets into a vibrating screen in batches;adding steel balls with different particle sizes at the same time; and vibrating and screening to obtain aluminum foils on the vibrating screen and lithium iron phosphate waste powder under the vibrating screen. According to the method, the situation that aluminum foils are damaged and enters the lithium iron phosphate waste powder in the vibrating and screening process is reduced; and meanwhile,lithium is activated, and a foundation is laid for direct repair and recovery of a lithium iron phosphate pyrogenic process.

Description

technical field [0001] The invention relates to the field of recycling waste positive pole pieces of lithium iron phosphate batteries, in particular to a vacuum separation method for waste and old lithium iron phosphate battery positive pole pieces. 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 attention to the "invi...

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 廖贻鹏周玉琳易鹏飞唐亦秋林文军王勇
Owner ZHUZHOU SMELTER GRP
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