The process of conventional hydrometallurgical recovery of lithium batteries not only consumes corrosive acid and long-time reaction

but also produces secondary wastes. In this paper

microwave-assisted deep eutectic solvent(DES) is used to leach and recover valuable metals from cathode material LiCoO_2(LCO). The leaching and recovery process is not only green and low-pollution

but also owns a fast reaction rate

good solubility stability of the valuable metal and high purity of the recovered product. Meanwhile

FT-IR

XRD

ICP-MS

SEM and electrochemical analysis methods are used to explore the mechanism of microwave-assisted DES leaching of valuable metals from LCO. The effects of experimental factors on the extraction efficiency of valuable metals are obtained by orthogonal test method. The degree of influence is DEStemperatureliquid-solid ratiotime.Afterwards

according to the results of orthogonal experiments

the single-factor experiments are successively adopted to explore the optimal experimental conditions for microwave-assisted leaching of valuable metals

99.86%of Li and 99.05% of Co can be extracted under the condition of choline chlorine-oxalic acid(ChCl-OA)

180 ℃

10 min and liquid/solid ratio(L/S) of 60 mL/g. At this time

Co exists in the leaching solution as formic acid cobalt.Finally

a green and efficient strategy for extraction of valuable metals from spent LiBs(LCO) through microwaveassisted DES is proposed

which provides an important reference method for recovery of valuable metals from spent lithium-ion batteries.