MOF-Derived Long Spindle-like Carbon-Coated Ternary Transition-Metal-Oxide Composite for Lithium Storage
Li‐Ming Wu, Yangai Liu, Hang Zhao, Zekun Wang, Bing Zhu, Xi Zhang, Peijie He, Yicen Liu, Tao Yang, Yicen Liu, Tao Yang
Abstract
High Resolution Image Download MS PowerPoint Slide Fe 3 O 4 is a promising alternative for next-generation lithium-ion batteries (LIBs). However, its poor cycle stability due to the large volume effect during cycling and poor conductivity hinders its application. Herein, we have successfully designed and prepared a carbon-coated ternary transition-metal-oxide composite (noted as (FeCoNi) 3 O 4 @C), which is derived from FeCoNi-MOF-74 (denoted as FeCoNi-211-24). (FeCoNi) 3 O 4 @C perfectly inherited the long spindle-shaped precursor structure, and (FeCoNi) 3 O 4 particles grew in situ on the precursor surface. The ordered particles and the carbon-coated structure inhibited the agglomeration of particles, improving the material’s cycle stability and conductivity. Therefore, the electrode exhibited excellent electrochemical performance. Specifically, (FeCoNi) 3 O 4 @C-700 presented excellent initial discharge capacity (763.1 mAh g –1 at 0.2 A g –1 ), high initial coulombic efficiency (73.8%), excellent rate capability, and cycle stability (634.6 mAh g –1 at 0.5 A g –1 after 505 cycles). This study provides a novel idea for developing anode materials for LIBs.