Surface reduction in lithium- and manganese-rich layered cathodes for lithium ion batteries drives voltage decay
Bo Wen, Farheen N. Sayed, Wesley M. Dose, Jędrzej K. Morzy, Yeonguk Son, Supreeth Nagendran, Caterina Ducati, Clare P. Grey, Michaël De Volder
Abstract
Li magic angle spinning solid state nuclear magnetic resonance and Raman spectroscopy. Thus, the voltage fade is believed to largely result from a heavily reduced particle surface. This hypothesis is further confirmed by galvanostatic intermittent titration technique analysis, which indicates that only very small shifts in equilibrium potential take place, in contrast to the overpotential which builds up after cycling. This suggests that a major source of the voltage decay is kinetic in origin, resulting from a heavily reduced particle surface with slow Li transport.
Topics & Concepts
OverpotentialMaterials scienceSpinelAnodeCathodeMagic angle spinningAnalytical Chemistry (journal)Lithium (medication)ElectrochemistryChemistryElectrodeMetallurgyEndocrinologyOrganic chemistryChromatographyNuclear magnetic resonance spectroscopyPhysical chemistryMedicineAdvancements in Battery MaterialsExtraction and Separation ProcessesAdvanced Battery Materials and Technologies