Affiliations: School of Chemistry and Chemical Engineering,
Southeast University, Nanjing 211189, China | Department of Chemistry, College of Natural Science,
Crawford University, P.M.B. 2001 Atan Agbara Road, Ogun State, Nigeria
Abstract: The electrochemical performance of as-recovered LiMn_{1/3}Ni_{1/3}Co_{1/3}O_2
adjusted with lithium has been investigated. Instead of Li_2MoO_4 lithium was
added to the powders prepared by mechano-thermal mixture of the
LiMn_{1/3}Ni_{1/3}Co_{1/3}O_2 recovered from
lithium-ion battery, Na_2MoO_{4}.2H_2O or
(NH_4)_6Mo_7O_{24}.4H_2O
with LiOH.H_2O. SEM and XRD analyses were performed. The
lithium adjusted powder L1 obtained from Na_2MoO_4.2H_2O calcined at
650°C delivered discharge capacities of 179, 184 and 178 mAhg^{-1}
at 0.1°C rate in the second, third and nineteenth cycles with
corresponding discharge-charge efficiencies of 84.3%, 94.3% and 96.9%
respectively. Meanwhile, the adjusted powder L2 obtained from (NH_4)_6Mo_7O_{24}.4H_2O
at the same temperature delivered lower value ranging between 154 and 164
mAhg^{-1} at the same discharge rate. The difference in the values delivered by
the two samples could be attributed to compounds used for the adjustment and
particle sizes revealed by the SEM images which showed that particles of L1 are
smaller than L2. The first powder showed better electrochemical performance
than second powder. The results showed that lithium was added to
LiMn_{1/3}Ni_{1/3}Co_{1/3}O_2
instead of Li_2MoO_4. However, the lithium addition through
the processes improved the electrochemical performance of the material
recovered. Also, compared with the literatures, DMSO used for the electrode
preparation could replace NMP in battery formulation.
