Electrochemical lithium recovery method

Electrochemical lithium recovery method

  • CN 103,276,406 B
  • Filed: 03/29/2013
  • Issued: 04/12/2017
  • Est. Priority Date: 03/29/2013
  • Status: Active Grant
First Claim
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1. a kind of method of Electrochemical lithium recovery, it is characterised in that adopt iron phosphate(

  • FePO4

    Material is enriched with by electrochemical methodLithium in solution, the iron phosphate material after lithiumation is re-prepared as lithium iron phosphate positive material by heat treatment;

    The electrochemistryUsing two electrodes and a kind of electrolyte aqueous solution containing lithium, one of electrode is the electrode of phosphoric acid iron material to method, separatelyOne be inert electrode, the inert electrode be platinum, nickel, ruthenium, titanium, carbon electrode, the electrolyte aqueous solution containing lithium for scrap lithium fromSub- battery lithium iron phosphate positive material is Jing acid dissolving and the High-pH solution after processing;

    The system of the electrolyte aqueous solution containing lithiumPreparation Method is:

    After waste lithium iron phosphate battery is disassembled, positive pole is taken out, be put in hydrochloric acid solution and dissolved, then adjusted with ammoniaSection pH value weakly acidic pH, is filtered to remove precipitation, obtains final product the electrolyte aqueous solution containing lithium;

    Above-mentioned iron phosphate material be nano ferric phosphate orIron phosphate/the carbon composite of carbon coated;

    The electrode of above-mentioned phosphoric acid iron material is the mixture compacting of iron phosphate material and carbonElectrode in conductive current collector;

    Used as negative pole, inert electrode is positive pole to the electrode of the phosphoric acid iron material, leads to constant current pairThe electrode of phosphoric acid iron material is discharged so that the embedding lithium of iron phosphate material forms lithiated iron phosphates material.

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