Enhancement of V2O5 Li-ion cathode stability by Ni/Co doped Li-borate-based glass

Abstract

In this research, we investigate the stability of a Li-ion cathode created by mixing a borate based glass which has been doped with Ni/Co and vanadium pentoxide (V₂O₅). V₂O₅ has a high specific capacity in battery systems because of its layered structure and variety of oxidation states. However, due to the flimsy structure, the capacity stability of V₂O₅ is fairly low. In this case, we seek to overcome the problem by mixing Ni/Co-doped borate based glass. The voltage-capacity graph demonstrates that the form of the glass mix was changed from a stairway shape to a straight line while the capacity was not much decreased. The crystallography study using X-ray diffractograms looked at whether the cycling test had changed the crystal structure of V₂O₅. The X-ray Absorption Near Edge Structure (XANES) results also reveal that V₂O₅'s oxidation state changed from V⁵⁺ to V⁴⁺. The glass mix can retain more of the V⁵⁺ state, indicating that glass mixture helps to release the Li-ions trapped in the structure. The findings of this study might contribute to the rapid advancement of renewable energy and electric vehicle technology.