Figure 14.

(a) Unregenerated LCO morphology, (b) morphology of LCO regenerated at 800 °C, (c) morphology of LCO regenerated at 900 °C [199], ROYAL SOC OF CHEM; (d) rate performance; (e) cycling performance at 1C; (f) charge–discharge curves at 1C [211], Elsevier; (g) rate performance of NCM622 sintered in air and oxygen atmospheres; (h) cycling performance at 1C of NCM622 sintered in air and oxygen atmospheres; (i) charge–Discharge Curves of NCM622 sintered in oxygen atmosphere [207], Elsevier; (j) C cycling and rate performance of recycled LiCoO₂ treated with pure LiOH and mixed Li salts; (k) cycling performance of original and hydrothermally regenerated LCO powders; (l) voltage–capacity plots of cathode regenerated by hydrothermal treatment at 220 °C followed by short annealing at 800 °C [226], ROYAL SOC OF CHEM.