Method for recovering active metal of lithium secondary battery
AssigneeSK Innovation Co., Ltd.
InventorsSuk Joon Hong, Hyeon Jung Kim, Sung Real Son, Dong Wook Ha, Ji Min Kim, Ji Yun Park
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Abstract
In a method of recovering an active metal of a lithium secondary battery, a cathode active material mixture is prepared from a waste cathode of a lithium secondary. The cathode active material mixture is reacted with a reductive reaction gas to form a preliminary precursor mixture having a reduction degree of transition metal defined by Equation 1 in a range from 0.24 to 1.6. A lithium precursor is recovered from the preliminary precursor mixture. A lithium recovery ration is improved by adjusting the reduction degree of transition metal.
Claims10
A method of recovering an active metal of a lithium secondary battery, the method comprising:
- preparing a cathode active material mixture comprising a lithium-transition metal oxide from a waste cathode of a lithium secondary battery;
- reacting the cathode active material mixture with a reductive reaction gas to form a preliminary precursor mixture having a reduction degree of transition metal defined by Equation 1 in a range from 0.24 to 1.6;
- and
- recovering a lithium precursor from the preliminary precursor mixture:
- wherein the reduction degree of transition metal=(MeO phase fraction+lithium-transition metal oxide phase fraction)/(Me phase fraction) [Equation 1]
- wherein Me includes Ni and Co;
- and
- wherein the MeO phase fraction, the lithium-transition metal oxide phase fraction and the Me phase fraction are measured by a Rietveld crystal structure analysis for X-ray diffraction (XRD) analysis peaks of the preliminary precursor mixture.
Dependencies are inferred from the claim text.