In Situ Construction of Heterostructured Co₃O₄/CoP Nanoflake Arrays on Carbon Cloth as Binder-Free Anode for High-Performance Lithium-Ion Batteries

Abstract

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.

Imidazole‐Intercalated Cobalt Hydroxide Enabling the Li+ Desolvation/Diffusion Reaction and Flame Retardant Catalytic Dynamics for Lithium Ion Batteries

“…Satellite peaks were observed at 787.3 eV and 803.39 eV. [15] The O 1s spectrum (Figure S8) revealed O=C, CoÀ OH, and OÀ C bonds at 531.05 eV, 531.42 eV, and 532.58 eV, respectively. [16] Among these, the presence of the CoÀ OH bond confirms the formation of metal hydroxide, specifically Co(OH) 2 , consistent with the XRD results.…”

“…X‐ray photoelectron spectroscopy (XPS) provided surface element analysis of MI−Co(OH) 2 ‐60‐3 h. The Co 2p spectrum (Figure S7) showed Co 2+ (798.65 eV) and Co 3+ (796.92 eV) in the Co 2p 1/2 orbits, as well as Co 2+ (783.3 eV) and Co 3+ (781.5 eV) in the Co 2p 3/2 orbits. Satellite peaks were observed at 787.3 eV and 803.39 eV [15] . The O 1s spectrum (Figure S8) revealed O=C, Co−OH, and O−C bonds at 531.05 eV, 531.42 eV, and 532.58 eV, respectively [16] .…”

The Lithium Storage Mechanism of Zero-Strain Anode Materials with Ultralong Cycle Lives

“…Graphite confronts a number of challenges when used as the anode material for commercial LIBs, such as low Li + insertion potential and poor electrolyte compatibility . Therefore, in recent years, there has been great research interest in developing new anode materials: the conversion type (Fe 2 O 3 , , Co 3 O 4 , MnO 2 , etc. ), the alloy type (Si, Sn, Al, Zn, etc.…”