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

RSC Adv. 2022 Sep 15;12(40):26111-26115. doi: 10.1039/d2ra04353j. eCollection 2022 Sep 12.

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.

PMID:36275102 | PMC:PMC9477065 | DOI:10.1039/d2ra04353j

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