						
Method			Reductant	Roast conditions	Leaching agent		Leaching condition	Efficiency [%]		Ref.
Pyro-hydrodrometallurgy	(NH4)2SO4	350 °C, 20 min		water			60 °C, 30 min		Li, Ni, Mn, Co > 98.5 %	[30]
Our study		-		700 °C, 1 h		HNO3			room temperature, 4 h	Li=74.7, Ni=85.1, 	-
														Mn=58.4, Co=52.6	
			-		500 °C, 1 h		demineralized water 	room temperature 4 h 	Li=18.6			-
						
