Manganese hexacyanomanganate open framework as a high-capacity positive electrode material for sodium-ion batteries
2014; Nature Portfolio; Volume: 5; Issue: 1 Linguagem: Inglês
10.1038/ncomms6280
ISSN2041-1723
AutoresHyun‐Wook Lee, Richard Y. Wang, Mauro Pasta, Seok Woo Lee, Nian Liu, Yi Cui,
Tópico(s)Supercapacitor Materials and Fabrication
ResumoPotential applications of sodium-ion batteries in grid-scale energy storage, portable electronics and electric vehicles have revitalized research interest in these batteries. However, the performance of sodium-ion electrode materials has not been competitive with that of lithium-ion electrode materials. Here we present sodium manganese hexacyanomanganate (Na2MnII[MnII(CN)6]), an open-framework crystal structure material, as a viable positive electrode for sodium-ion batteries. We demonstrate a high discharge capacity of 209 mAh g(-1) at C/5 (40 mA g(-1)) and excellent capacity retention at high rates in a propylene carbonate electrolyte. We provide chemical and structural evidence for the unprecedented storage of 50% more sodium cations than previously thought possible during electrochemical cycling. These results represent a step forward in the development of sodium-ion batteries.
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