Recovery of Li and Co in Waste Lithium Cobalt Oxide-Based Battery Using H<sub<1.6</sub<Mn<sub<1.6</sub<O<sub<4</sub<

H<sub<1.6</sub<Mn<sub<1.6</sub<O<sub<4</sub< lithium-ion screen adsorbents were synthesized by soft chemical synthesis and solid phase calcination and then applied to the recovery of metal Li and Co from waste cathode materials of a lithium cobalt oxide-based batt...
Ausführliche Beschreibung

H<sub<1.6</sub<Mn<sub<1.6</sub<O<sub<4</sub< lithium-ion screen adsorbents were synthesized by soft chemical synthesis and solid phase calcination and then applied to the recovery of metal Li and Co from waste cathode materials of a lithium cobalt oxide-based battery. The leaching experiments of cobalt and lithium from cathode materials by a citrate hydrogen peroxide system and tartaric acid system were investigated. The experimental results showed that under the citrate hydrogen peroxide system, when the temperature was 90 °C, the rotation speed was 600 r·min<sup<−1</sup< and the solid–liquid ratio was 10 g·1 L<sup<−1</sup<, the leaching rate of Co and Li could reach 86.21% and 96.9%, respectively. Under the tartaric acid system, the leaching rates of Co and Li were 90.34% and 92.47%, respectively, under the previous operating conditions. The adsorption results of the lithium-ion screen showed that the adsorbents were highly selective for Li<sup<+</sup<, and the maximum adsorption capacities were 38.05 mg·g<sup<−1</sup<. In the process of lithium removal, the dissolution rate of lithium was about 91%, and the results of multiple cycles showed that the stability of the adsorbent was high. The recovery results showed that the purity of LiCl, Li<sub<2</sub<CO<sub<3</sub< and CoCl<sub<2</sub< crystals could reach 93%, 99.59% and 87.9%, respectively. LiCoO<sub<2</sub< was regenerated by the sol–gel method. XRD results showed that the regenerated LiCoO<sub<2</sub< had the advantages of higher crystallinity and less impurity. Ausführliche Beschreibung