Abstract
Manganese hexacyanoferrate (Mn-PBA) is a promising cathode material forsodium-ion secondary battery (SIB) with high average voltage (=3.4 V) against Na. Here,we find that the thermal decomposition of glucose modifies the surface state of Mn-PBA,without affecting the bulk crystal structure. The glucose treatment significantly improves therate properties of Mn-PBA in SIB. The critical discharge rate increases from 1 C (as-grown)to 15 C (glucose-treated). Our observation suggests that thermal treatment is quite effectivefor insulating coordination polymers.
Highlights
IntroductionCoordination polymers are promising cathode materials for lithium-ion secondary batteries (LIBs), due to their robust nature of the frameworks against Li+ intercalation/deintercalation
Coordination polymers are promising cathode materials for lithium-ion secondary batteries (LIBs), due to their robust nature of the frameworks against Li+ intercalation/deintercalation.Among the coordination polymers, transition metal hexacyanoferrates or the Prussian blue analogues (PBA) [1], Ax M [Fe(CN)6 ]y (A and M are the alkali and transition metals, respectively), are most intensively investigated as cathode materials for LIBs
The scanning electron microscopy (SEM) images were obtained with SU8020 at Faculty of Pure and Applied Science and the OPEN FACILITY, Research Facility Center for Science and Technology, University of Tsukuba
Summary
Coordination polymers are promising cathode materials for lithium-ion secondary batteries (LIBs), due to their robust nature of the frameworks against Li+ intercalation/deintercalation. Thin films of Li1.32 MnII [FeII (CN)6 ]0.83 3.5H2 O [5,6], shows a large capacity of 128 mAh/g and an average operating voltage of 3.6 V against Li. PBAs are promising cathode materials for sodium-ion secondary batteries (SIBs) [7,8,9,10,11,12,13,14]. Rhombohedral Prussian white, Na1.92 Fe[Fe(CN)6 ], works as a cathode material for SIBs. the coordination polymer has serious drawback, i.e., low electric conductivity. The glucose treatment significantly improves the rate property of manganese hexacyanoferrate (Mn-PBA) in SIB
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