Synergistic Structure and Iron-Vacancy Engineering Realizing High Initial Coulombic Efficiency and Kinetically Accelerated Lithium Storage in Lithium Iron Oxide.

ABSTRACT: Transition metal oxides with high capacity still confront the challenges of low initial coulombic efficiency (ICE, generally <70%) and inferior cyclic stability for practical lithium-storage. Herein, a hollow slender carambola-like Li_0.43 FeO_1.51 with Fe vacancies is proposed by a facile reaction of Fe³⁺ -containing metal-organic frameworks with Li₂ CO₃ . Synthesis experiments combined with synchrotron-radiation X-ray measurements identify that the hollow structure is caused by Li₂ CO₃ erosion, while the formation of Fe vacancies is resulted from insufficient lithiation process with reduced Li₂ CO₃ dosage. The optimized lithium iron oxides exhibit remarkably improved ICE (from 68.24% to 86.78

SUBMITTER: Wu N 

PROVIDER: S-EPMC10037985 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature