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Method for recycling lithium in lithium iron phosphate through electrochemical method

A lithium iron phosphate, electrochemical technology, applied in the field of energy materials, to achieve the effects of efficient recovery, high migration rate, and high selectivity

Inactive Publication Date: 2016-09-14
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is to use the acid-dissolved solution of the waste lithium iron phosphate positive electrode material of the lithium ion battery as the electrolyte to recover lithium, and the recovered lithium enters the iron phosphate to form lithium iron phosphate. Novelty, but this method can only recover ionic solutions with low value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Use lithium iron phosphate as the positive electrode sheet, sodium chloride aqueous solution as the electrolyte, graphite as the negative electrode, and apply a 0.1V electric potential to it in an electrolytic cell for electrochemical recovery. The concentration of the sodium chloride solution is 0.025mol / L, the time is 2h, the lithium ions in the positive electrode sheet migrate into the electrolyte solution to form a lithium-containing solution. A lithium-containing solution is obtained. After the experiment is over, the lithium content in the positive electrode sheet is detected, the migration rate of lithium can reach 95.3%, and the lithium content in the lithium-containing solution is detected, which is 1.1g / L (with Li 2 O meter).

[0026] Step 2: Concentrate the lithium-containing solution obtained in step 1 to Li 2 A solution with an O content of 33g / L, to which 280g / L Na is added 2 CO 3 , The excess coefficient is 105%, and the precipitation of lithium carb...

Embodiment 2

[0028] Step 1: Use the lithium iron phosphate material as the positive electrode sheet, the lithium sulfate aqueous solution as the electrolyte, and the copper sheet as the negative electrode, and apply a 0.3V potential to it in an electrolytic cell for electrochemical recovery. The concentration of the lithium sulfate solution is 0.5mol / L, the time is 1.5h, the lithium ions in the positive electrode sheet migrate into the electrolyte solution to form a lithium-containing solution. After the experiment is over, the lithium content in the positive electrode sheet is detected, the migration rate of lithium can reach 99.1%, and the lithium content in the lithium-containing solution is detected, which is 1.1g / L (with Li 2 O meter).

[0029] Step 2: Concentrate the lithium-containing solution obtained in step 1 to Li 2 A solution with an O content of 33g / L, to which 280g / L Na is added 2 CO 3 , The excess coefficient is 105%, and the precipitation of lithium carbonate is obtained. After...

Embodiment 3

[0031] Step 1: Using lithium iron phosphate as the positive electrode, lithium sulfate aqueous solution as the electrolyte, and copper as the negative electrode, apply a 1.2V potential to it in an electrolytic cell for electrochemical recovery, where the electrolyte concentration is 0.8 mol / L, the time is 5h, the lithium ions in the positive electrode sheet migrate into the electrolyte solution to form a lithium-containing solution. After the experiment is over, the lithium content in the positive electrode sheet is detected, the migration rate of lithium can reach 99.6%, and the lithium content in the lithium-containing solution is detected, which is 1.5g / L (with Li 2 O meter).

[0032] Step 2: Concentrate the lithium-containing solution obtained in step 1 to Li 2 A solution with an O content of 30g / L, to which 285g / L Na is added 2 CO 3 , The excess coefficient is 105%, and the precipitation of lithium carbonate is obtained. After the precipitation is completed for 20 minutes, t...

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Abstract

The invention relates to a method for recycling lithium in lithium iron phosphate through an electrochemical method, and belongs to the technical field of energy materials. The method for recycling the lithium in the lithium iron phosphate through the electrochemical method is the technical purpose needing to be achieved. According to the method, the lithium iron phosphate serves as a positive electrode, a metal or carbon type electrode serves as a negative electrode, a water-based solution serves as an electrolyte, the electric potential is applied, and lithium ions in a positive electrode material of a lithium battery move into the electrolyte water solution to form a lithium-containing solution. By means of the method, the lithium can be extracted from the lithium iron phosphate at a time, the lithium solution is formed, the emigration rate of the lithium is high and can reach 90% or above and even reach up to 99%, the content of impurities in the obtained lithium solution is low, and therefore the lithium element can be easily and efficiently recycled from the lithium iron phosphate.

Description

Technical field [0001] The invention relates to a method for recovering lithium in lithium iron phosphate by electrochemical method, and belongs to the technical field of energy materials. Background technique [0002] Lithium batteries, including lithium ion batteries and lithium metal batteries. Lithium-ion batteries usually use lithium-containing compounds as the positive electrode and carbon materials as the negative electrode. The lithium metal battery is a battery that uses lithium compounds as the positive electrode, lithium metal or lithium alloy as the negative electrode material, and uses a non-aqueous electrolyte solution. [0003] Lithium iron phosphate, namely lithium iron phosphate (LiFePO 4 ) As a newly developed electrode material for lithium-ion batteries, it is mainly used for power lithium-ion batteries and used as a positive electrode active material. It has the advantages of large discharge capacity, low price, non-toxicity, and no environmental pollution. [0...

Claims

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Application Information

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IPC IPC(8): C25C1/02H01M10/0525H01M10/54
CPCC25C1/02H01M10/0525H01M10/54Y02E60/10Y02P10/20Y02W30/84
Inventor 曹乃珍高洁徐川高宜宝陶帅党春霞
Owner TIANQI LITHIUM CORP
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