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Recovery method for cathode material of waste lithium iron phosphate battery

A lithium iron phosphate battery and cathode material technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve problems such as complex process routes, increased costs, and poor performance of lithium-ion batteries, and achieve shortened process Process, cost saving, low cost effect

Inactive Publication Date: 2018-02-27
FUZHOU UNIV
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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, which makes the performance of the regenerated lithium-ion battery poor.
Most hydrometallurgical treatment methods choose to use excess strong acid to completely leach the ions in the battery and th

Method used

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  • Recovery method for cathode material of waste lithium iron phosphate battery

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Comparison scheme
Effect test

Embodiment 1

[0023] A method for recycling the positive electrode material of a waste lithium iron phosphate battery, comprising the following steps:

[0024] 1) Discharge, disassemble, and separate the waste lithium iron phosphate battery to obtain the battery core and shell. The battery core is disassembled and separated to obtain the positive electrode sheet containing the lithium iron phosphate positive electrode active material, which is placed in a 0.4mol / l NaOH solution Ultrasonic machine treatment for 10 minutes to make lithium iron phosphate positive electrode active material and aluminum foil;

[0025] 2) Take 100g of the lithium iron phosphate cathode active material obtained in step 2) to react with sulfuric acid + hydrogen peroxide, lithium and acid H + The molar ratio of lithium to H is 1:0.98 2 o 2 The molar ratio of the hydrogen peroxide is 1:0.5, and the hydrogen peroxide can oxidize ferrous iron to ferric iron while promoting the reaction speed of the experiment. Other...

Embodiment 2

[0029] A method for recycling the positive electrode material of a waste lithium iron phosphate battery, comprising the following steps:

[0030] 1) Discharge, disassemble, and separate the waste lithium iron phosphate battery to obtain the battery cell and shell. The battery cell is disassembled and separated to obtain the positive electrode sheet containing the lithium iron phosphate positive electrode active material, which is placed in a 0.35mol / l NaOH solution Ultrasonic machine treatment for 10 minutes to make lithium iron phosphate positive electrode active material and aluminum foil;

[0031] 2) Take 100g of the lithium iron phosphate cathode active material obtained in step 2) to react with hydrochloric acid + hydrogen peroxide, lithium and acid H + The molar ratio is 1:1, Li and H 2 o 2 The molar ratio of the hydrogen peroxide is 1:0.52, and the hydrogen peroxide can oxidize ferrous iron to ferric iron while promoting the reaction speed of the experiment. Other re...

Embodiment 3

[0035] A method for recycling the positive electrode material of a waste lithium iron phosphate battery, comprising the following steps:

[0036] 1) Discharge, disassemble and separate the waste lithium iron phosphate battery to obtain the battery cell and shell. The battery cell is disassembled and separated to obtain the positive electrode sheet containing the lithium iron phosphate positive electrode active material, and placed in an ultrasonic machine containing 0.45mol / l NaOH solution for 15 minutes to make the lithium iron phosphate positive electrode active material and aluminum foil;

[0037] 2) Take 100g of the lithium iron phosphate cathode active material obtained in step 2) to react with bromic acid + hydrogen peroxide, lithium and acid H + The molar ratio of lithium and H is 1:1.02 2 o 2 The molar ratio of the hydrogen peroxide is 1:1.55, and the hydrogen peroxide can oxidize ferric iron to ferric iron while promoting the reaction speed of the experiment. Other...

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Abstract

The invention discloses a recovery method for a cathode material of a waste lithium iron phosphate battery. The recovery method comprises the following steps: firstly, placing a positive plate obtained through disassembly of the waste lithium iron phosphate battery in an ultrasonic machine containing a dilute alkali liquor to be processed, so that a lithium iron phosphate material is separated from an aluminum foil; then, drying the lithium iron phosphate material, after that, performing acid leaching under a normal-temperature condition, and controlling the quantity of an acid solution to ensure that the pH of the solution is 2.5-6.5 after finish of a reaction and iron exists in insoluble residues in the format of iron phosphate, wherein the leaching rate of lithium is more than 97% and the leaching rate of iron is less than 0.1%; and performing filtering to obtain a filtrate and insoluble iron phosphate, performing heat treatment on the insoluble residues to remove organics so as toobtain ferric phosphate, and after purification and enrichment of the filtrate, adding trisodium phosphate for a reaction to obtain lithium phosphate. In the whole recovery process, the yields of lithium and iron are respectively 96% and 99.5%. The recovery method has the advantages that used equipment is simple, the technological process is short, and valuable raw materials are efficiently recovered.

Description

technical field [0001] The invention relates to the field of recycling of waste lithium iron phosphate batteries, in particular to a method for recycling positive electrode materials of waste lithium iron phosphate batteries. Background technique [0002] Polyanionic material lithium iron phosphate (LiFePO 4 , often abbreviated as LFP) can be used as the positive electrode material of lithium-ion batteries. Due to the rich iron resources, low price and no pollution, especially its stable structure and safe performance are suitable for large power sources such as electric vehicles, making LiFePO 4 It has become one of the ideal electrode materials for electric vehicles and electric tools, and has been widely used. Therefore, it will become particularly important to recycle lithium-ion batteries using lithium iron phosphate as the positive electrode material (hereinafter referred to as lithium iron phosphate batteries). [0003] CN 104953200 A discloses a method for reclaim...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B21/00C22B26/12H01M10/54
CPCC22B7/007C22B21/0069C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 旷戈邢盛洲汤军军刘瑜李付杰陈玉红
Owner FUZHOU UNIV
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