Higher Than 90% Initial Coulombic Efficiency with Staghorn-Coral-Like 3D Porous LiFeO<sub>2-</sub> <sub>x</sub> as Anode Materials for Li-Ion Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 32329179.
- Also identified by DOI 10.1002/adma.201908285.
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Abstract
Transition metal oxides represent a promising class of anode materials for high-capacity lithium-ion batteries. However, low initial coulombic efficiency (ICE, <80%) still remains a crucial challenge for practical applications. Herein, a unique 3D Fe(II)-rich porous LiFeO<sub>2-</sub> <sub>x</sub> comprising of staghorn-coral-like skeleton measuring ≈100 nm in diameter is demonstrated, which is readily prepared by reacting Fe<sub>2</sub> O<sub>3</sub> with LiH at 550 °C. When used as an anode material, the Fe(II)-rich LiFeO<sub>2-</sub> <sub>x</sub> delivers the presently known highest ICE value of 90.2% with 1170 mAh g<sup>-1</sup> discharge capacity. The high ICE value can be ascribed to a fast conversion reaction of LiFeO<sub>2-</sub> <sub>x</sub> upon lithiation/delithiation facilitated by the presence of Fe(II), which generates oxygen vacancies and makes electron transportation much easier, based on the experimental results and density functional theory (DFT) calculations.