4.5 Article

Recovering Lithium from the Cathode Active Material in Lithium-Ion Batteries via Thermal Decomposition

Journal

METALS
Volume 10, Issue 4, Pages -

Publisher

MDPI
DOI: 10.3390/met10040433

Keywords

recovery; carbonation; lithium carbonate; lithium ion battery

Funding

  1. JSPS KAKENHI [17H01925, 19K12435]
  2. Iwatani Naoji Foundation
  3. Takahashi Industrial and Economic Research Foundation

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In this study, calcination tests were performed on a mixed sample of lithium cobalt oxide and activated carbon at 300-1000 degrees C under an argon atmosphere. The tests were conducted to discover an effective method for recovering lithium and cobalt from the cathode active material used in lithium-ion batteries. Additionally, the effect of soluble fluorine on the purification of lithium carbonate was investigated by the addition of lithium fluoride to an aqueous lithium hydroxide solution and a CO2 flow test was performed. The lithium recovery was >= 90% when the calcination occurred at temperatures of 500-600 degrees C. However, the percent recovery decreased at temperatures >= 700 degrees C. It was demonstrated that in order to increase the recovery while maintaining 99% purity of lithium carbonate in the recovered material, it was imperative to increase the temperature of the solution and to limit the F/Li ratio (mass%/mass%) in the solution to a value that did not exceed 0.05.

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