Abstract
As the world moves to greener and renewable energy generation technologies, scientific researchers are facing a great challenge of concurrently developing energy storage materials with a low production cost, environmentally benign, high-energy density, and good safety. In this work, we report on the improved cycling and reduced phase transformation of the well-studied n-Li2MnO3 achieved by doping with Europium. It was established from cyclic voltammetry results that Eu-doping had a stabilization effect on the lattice oxygen and further prevented the migration of the manganese ions previously coordinated to the released lattice oxygen, into vacant octahedral site that were occupied by the removed Li+. As such, the new material exhibited an increase in conductivity with cycling and coulombic efficiency increased from ∼74 to ∼88% over 100 cycles. Moreover, the discharge capacity of Li2Mn0.95Eu0.05O3 improved with cycling from 4.20 mAh.g − 1 to 5.47 mAh.g − 1.
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