Enhancing Li-ion capacity and rate capability in cation-defective vanadium ferrite aerogels via aluminum substitution.

ABSTRACT: Cation-defective iron oxides have proven to be effective Li-ion charge-storage hosts in nonaqueous electrolytes, particularly when expressed in disordered, nanoscale forms such as aerogels. Replacing a fraction of Fe sites in ferrites with high-valent cations such as V⁵⁺ introduces cation-vacancy defects that increase Li-ion capacity. Herein, we show that compositional substitution with electroinactive Al³⁺ further increases Li-ion capacity by 30% when incorporated within a disordered VFe₂Ox aerogel, as verified by electrochemical tests in a two-terminal Li half-cell. We use electroanalytical techniques to show that both Al-VFe₂Ox and VFe₂Ox aerogels exhibit many of the hallmarks of pseudocapacitive materials, incl

SUBMITTER: Chervin CN 

PROVIDER: S-EPMC8697807 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature