TY - JOUR
T1 - Investigation of metastable Na2FeSiO4 as a cathode material for Na-ion secondary battery
AU - Kee, Yongho
AU - Dimov, Nikolay
AU - Staykov, Aleksandar
AU - Okada, Shigeto
PY - 2016/3/1
Y1 - 2016/3/1
N2 - Li2FeSiO4 has been widely investigated as a promising cathode material due to its high theoretical capacity of 330 mAh g-1 via two electron reactions. However, its Na-equivalent was not reported yet even it could considerably reduce the potential product costs due to the abundance of sodium resources in nature. In this study, sodium iron silicate with an empirical formula unit, Na2FeSiO4, was synthesized via solvothermal synthesis with two unavoidable impurities, Na2SiO3 and Fe3O4, for the first time. Galvanostatic charge/discharge test vs. Na/Na+ showed an initial discharge capacity of 126 mAh g-1 at 1/40 C in a voltage range of 1.0-4.1 V (1C = 138 mA g-1). However, during the initial charge, sodium iron silicate underwent irreversible crystal lattice breakdown and became amorphous.
AB - Li2FeSiO4 has been widely investigated as a promising cathode material due to its high theoretical capacity of 330 mAh g-1 via two electron reactions. However, its Na-equivalent was not reported yet even it could considerably reduce the potential product costs due to the abundance of sodium resources in nature. In this study, sodium iron silicate with an empirical formula unit, Na2FeSiO4, was synthesized via solvothermal synthesis with two unavoidable impurities, Na2SiO3 and Fe3O4, for the first time. Galvanostatic charge/discharge test vs. Na/Na+ showed an initial discharge capacity of 126 mAh g-1 at 1/40 C in a voltage range of 1.0-4.1 V (1C = 138 mA g-1). However, during the initial charge, sodium iron silicate underwent irreversible crystal lattice breakdown and became amorphous.
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U2 - 10.1016/j.matchemphys.2016.01.033
DO - 10.1016/j.matchemphys.2016.01.033
M3 - Article
AN - SCOPUS:84971233962
VL - 171
SP - 45
EP - 49
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
SN - 0254-0584
ER -