Lithiation Mechanism in High-Entropy Oxides as Anode Materials for Li-Ion Batteries: An Operando XAS Study.

ABSTRACT: High-entropy oxides based on transition metals, such as Mg_0.2Co_0.2Ni_0.2Cu_0.2Zn_0.2O (TM-HEO), have recently drawn special attention as potential anodes in lithium-ion batteries due to high specific capacity and cycling reversibility. However, the lithiation/delithiation mechanism of such systems is still controversial and not clearly addressed. Here, we report on an operando XAS investigation into TM-HEO-based anodes for lithium-ion cells during the first lithiation/delithiation cycle. This material showed a high specific capacity exceeding 600 mAh g^-1 at 0.1 C and Coulombic efficiency very close to unity. The combination of functional and advanced spectroscopic studies revealed complex charging mechanisms, developing through

SUBMITTER: Ghigna P 

PROVIDER: S-EPMC8016163 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature