Abstract
Na-ion battery is one of the best alternatives to Li-ion battery. Abundance of sodium on earth is three orders of magnitude higher than lithium, which should make Na-ion battery technology cheaper. But alkaline-ion battery prices, which tend to increase because of the massive world demand, also depend on the choice of electrode materials. Therefore, cost-effective electrode development remains an important subject of research because this will allow Na-ion battery to be even more competitive. Electrochemical performances of anhydrous VOSO4 as electrode for Na-ion battery are reported in this letter. Two anhydrous phases of vanadyl sulfate have been studied. The first one, α-VOSO4, shows that up to 0.8 sodium per formula unit (Na/f.u.) can be intercalated in this phase, and a reversible intercalation of 0.4 Na/f.u. has been observed with a strong polarization. The second one, β-VOSO4, can intercalate up to 0.9 Na/f.u. with a reversible intercalation of 0.4 Na/f.u. leading to a reversible capacity of 64 mAh/g.
Highlights
The search for new materials that could be used as electrode material for the Na-ion batteries is one of today’s most challenging issues
We report the use of anhydrous vanadyl sulfate as an electrode material for Na-ion battery
We demonstrated that αand β-VOSO4 can be used as an electrode material in Na-ion battery
Summary
The search for new materials that could be used as electrode material for the Na-ion batteries is one of today’s most challenging issues. Electrochemical performances of anhydrous VOSO4 as electrode for Na-ion battery are reported in this letter. The first one, α-VOSO4, shows that up to 0.8 sodium per formula unit (Na / f.u.) can be intercalated in this phase, and a reversible intercalation of 0.4 Na / f.u. has been observed with a strong polarization.
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