Abstract
A new hydrometallurgical route was investigated for improvement in the recycling of valuable metals from electrodes of lithium batteries. The recycling process involves reductive acid leaching, doublesolvent extraction, and direct electro-winning in an organic solution. The dissolution rate of metal from the electrodes was up to 90% in 2 M sulfuric acid with hydrogen peroxide (10 vol%) at 75 °C, within 60 min. The improvement of dissolution by hydrogen peroxide seems to be due to reduction of Co(III) to Co(II), which can readily be dissolved. Cobalt and lithium were extracted into Cyanex 272 and a room-temperature ionic liquid of [EMIM] TFSI, respectively, whereas most nickel and manganese did not move to the organic phases. Lithium in the [EMIM] TFSI could be directly reduced as a form of metal by non-aqueous electrowinning. The dense electrodeposits were composed of metallic lithium and an alloy with a gold substrate. †(Received September 26, 2013)
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