Morphology of the Discharge Product in Non‐aqueous Lithium–Oxygen Batteries: Furrowed Toroid Particles Correspond to a Lower Charge Voltage. Issue 3 (6th January 2016)

• Record Type: Journal Article
• Authors: Tan, Peng; Shi, Le; Shyy, Wei; Zhao, Tianshou
• Is Part Of: Energy technology. Volume 4:Issue 3(2016:Mar.)
• Page Start: 393
• Page End: 400
• Publication Date: 2016-01-06
• Subjects: batteries -- charge voltage -- electrochemistry -- morphology -- peroxides; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.201500271
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract: A type of discharge particle morphology that closely resembles furrowed toroid particles, which are formed at high operating oxygen pressures, was discovered. It was also found that the charge voltage required to decompose furrowed toroid particles was lower than that to decompose toroid‐shaped particles. Combined experimental and density functional theory investigations showed that the formation of furrowed toroid particles could be attributed to an increase in the proportion of the intermediate discharge product LiO2, which gravitates toward adsorbing onto the surface of the Li2 O2 crystal layers rather than onto the carbon substrate. Moreover, the increased proportion of LiO2 in the discharge product particles was found to improve the effective electrical conductivity, which thereby lowered the charge voltage. The findings suggest that the charge voltage can effectively be reduced and the efficiency of the battery can be improved by creating discharge products in the morphology of furrowed toroid particles. Abstract : It's got potential : The formation of furrowed toroid particles at high O2 pressures is attributed to an increase in the proportion of the intermediate discharge product LiO2, which prefers to adsorb onto the surface of the formed Li2 O2 crystal layers rather than onto the carbon substrate. The increased proportion of LiO2 in the discharge product particles at high O2 pressures improves the effective electrical conductivity, which thereby lowers the charge voltage.