Cobalt
oxide (Co3O4) is regarded as the anode
material for lithium-ion batteries (LIBs) with great research value
owing to its environmental friendliness and exceptional theoretical
capacity. However, the low intrinsic conductivity, poor electrochemical
kinetics, and unsatisfactory cycling performance severely limit its
practical applications in LIBs. The construction of a self-standing
electrode with heterostructure by introducing a highly conductive
cobalt-based compound is an effective strategy to solve the above
issues. Herein, Co3O4/CoP nanoflake arrays (NFAs)
with heterostructure are constructed skillfully directly grown on
carbon cloth (CC) by in situ phosphorization as an anode for LIBs.
Density functional theory simulation results demonstrate that the
construction of heterostructure greatly increases the electronic conductivity
and Li ion adsorption energy. The Co3O4/CoP
NFAs/CC exhibited an extraordinary capacity (1490.7 mA h g‑l at 0.1 A g‑l) and excellent performance at high
current density (769.1 mA h g‑l at 2.0 A g‑l), as well as remarkable cyclic stability (451.3 mA h g‑l after 300 cycles with a 58.7% capacity retention rate). The reasonable
construction of heterostructure can promote the interfacial ion transport,
significantly enhance the adsorption energy of lithium ions, improve
the conductivity of Co3O4 electrode material,
promote the partial charge transfer throughout the charge and discharge
cycles, and enhance the overall electrochemical performance of the
material.
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