Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 15, Pages 7780-7785Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta00396b
Keywords
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Funding
- Natural Science Foundation of China [513111014, 21175050]
- PCSIRT (Program for Changjiang Scholars and Innovative Research Team in University)
- Fund of Department of Education of Henan Province [14B150030, 15A150014]
- Henan Normal University [5101039170119, 5101039170131]
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Nanostructured delta-MnO2 incorporated with alkali cations (A-delta-MnO2, A = K+, Na+) has been synthesized and evaluated as a cathode material for aqueous sodium-ion batteries. It is observed that Na+ ions are easier than K+ ions to intercalate into the layered delta-MnO2 due to their smaller ion radius. The incorporation of K+ and Na+ into delta-MnO2 shows a great influence on the electrochemical performance of the layered delta-MnO2. The full cell with (K, Na)-co-incorporated delta-MnO2 (K : Na : Mn = 0.15 : 0.26 : 1) hierarchical nanospheres as the cathode and NaTi2(PO4)(3) as the anode exhibits a specific capacity of 74.6 mA h g(-1) at 150 mA g(-1), and the capacity remains at similar to 62% at a high current density of 600 mA g(-1). The electrochemical cycling does not induce observable structural degradation even after 200 cycles. K-incorporated and (K, Na)-co-incorporated delta-MnO2 electrodes have superior capacity and rate capability, which can be ascribed to their hierarchical structure and adequate crystallinity.
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