Hydrothermal vanadium manganese oxides: Anode and cathode materials for lithium-ion batteries

摘要

Vanadium manganese oxides with Mn content up to 33 at% were synthesized by a low temperature hydrothermal route allowing for the preparation of both anodic and cathodic materials for Li-ion batteries. Low amounts of manganese (below 13 at%) lead to the formation of elongated particles of layered hydrated vanadium oxides with manganese and water intercalated between the V2O5 slabs, while for higher Mn content of 33 at%, monoclinic MnV(2)0(6) is formed. Former materials are suitable for high energy cathodes while the latter one is an anodic compound. The material containing 10 at% Mn has the composition MnO2V2O5 center dot 0.9H(2)O and shows the best cathodic activity with 20% capacity improvement over V2O5 center dot 0.5H(2)O. Lithiated MnV2O6 with Li5MnV2O6 composition prepared electrochemically was evaluated for the first time as anode in a full-cell against MnO2V2O5 center dot 0.9H(2)O cathode. An initial capacity ca. 300 A h kg(-1) was measured with this battery corresponding to more than 500 Wh kg(-1). These results confirm the prospect of using Li5MnV2O6 anodes in lithium-ion batteries as well as high-capacity layered hydrated vanadium oxides cathodes such as V2O5 center dot 0.5H(2)O and MnO2V2O5 center dot 0.9H(2)O. (C) 2015 Elsevier B.V. All rights reserved.