Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 40, Pages 34222-34229Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b11157
Keywords
manganese hexacyanoferrate; sodium cathode; lattice water; sodiation process; full cell
Funding
- National Natural Science Foundation of China [U1632151, 61076040]
- Key Research and Development Project of Anhui Province of China [1704a0902023]
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Low-cost manganese hexacyanoferrate (NMHCF) possesses many favorable advantages including high theoretical capacity, ease of preparation, and robust open channels that enable faster Na+ diffusion kinetics. However, high lattice water and low electronic conductivity are the main bottlenecks to their pragmatic realization. Here, we present a strategy by anchoring NMHCF on reduced graphene oxide (RGO) to alleviate these problems, featuring a specific discharge capacity of 161/121 mA h g(-1) at a current density of 20/200 mA g(-1). Moreover, the sodiation process is well revealed by ex situ X-ray diffraction, EIS and Car-Parrinello molecular dynamics simulations. At a rate of 20 mA g(-1) the hard carbon//NMHCF/RGO full cell affords a stable discharge capacity of 84 mA h g(-1) (based on the weights of cathode mass) over SO cycles, thus highlighting NMHCF/RGO an alternative cathode for sodium-ion batteries.
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