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Understanding origin of voltage hysteresis in conversion reaction for na rechargeable batteries: The case of cobalt oxides

Cited 57 time in Web of Science Cited 60 time in Scopus

Kim, Haegyeom; Kim, Hyunchul; Kim, Hyungsub; Kim, Jinsoo; Yoon, Gabin; Lim, Kyungmi; Yoon, Won-Sub; Kang, Kisuk

Issue Date
John Wiley & Sons Ltd.
Advanced Functional Materials, Vol.26 No.28, pp.5042-5050
Conversion reaction electrodes offer a high specific capacity in rechargeable batteries by utilizing wider valence states of transition metals than conventional intercalation-based electrodes and have thus been intensively studied in recent years as potential electrode materials for high-energy-density rechargeable batteries. However, several issues related to conversion reactions remain poorly understood, including the polarization or hysteresis during charge/discharge processes. Herein, Co3O4 in Na cells is taken as an example to understand the aforementioned properties. The large hysteresis in charge/discharge profiles is revealed to be due to different electrochemical reaction paths associated with respective charge and discharge processes, which is attributed to the mobility gap among inter-diffusing species in a metal oxide compound during de/sodiation. Furthermore, a Co3O4-graphene nanoplatelet hybrid material is demonstrated to be a promising anode for Na rechargeable batteries, delivering a capacity of 756 mAh g(-1) with a good reversibility and an energy density of 96 Wh kg(-1) (based on the total electrode weight) when combined with a recently reported Na4Fe3(PO4)(2)(P2O7) cathode.
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