Understanding Origin of Voltage Hysteresis in Conversion Reaction for Na Rechargeable Batteries: The Case of Cobalt Oxides
- Authors
- Kim, H[Kim, Haegyeom]; Kim, H[Kim, Hyunchul]; Kim, H[Kim, Hyungsub]; Kim, J[Kim, Jinsoo]; Yoon, G[Yoon, Gabin]; Lim, K[Lim, Kyungmi]; Yoon, WS[Yoon, Won-Sub]; Kang, K[Kang, Kisuk]
- Issue Date
- 25-Jul-2016
- Publisher
- WILEY-V C H VERLAG GMBH
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.26, no.28, pp.5042 - 5050
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 26
- Number
- 28
- Start Page
- 5042
- End Page
- 5050
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/35895
- DOI
- 10.1002/adfm.201601357
- ISSN
- 1616-301X
- Abstract
- 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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