Design and Synthesis of Mesoporous Honeycomb‐Like CoP/Co₂P Hybrids as Anode with a High Cyclic Stability in Lithium‐Ion Batteries

Abstract

In this work, a multistep synthetic strategy was exploited to fabricate a new honeycomb‐like metallic phosphide nanohybrid (CoP/Co2P) based on an evaporating reduction and calcination approach. We characterized the as‐prepared samples in terms of crystal structure, morphology, and electrochemical performance by using XRD, field‐emission scanning electron microscopy, TEM, charge–discharge tests, and electrochemical impedance spectroscopy. As an anode material for lithium‐ion batteries, the CoP/Co2P hybrid anode demonstrated a good capacity retention with a specific capacity of 851.2 mAh g−1 at 200 mA g−1 after 450 cycles and a reversible capacity of 590 mAh g−1 at a high charge/discharge current density of 1000 mA g−1.

Peapod-Like Structured B/N Co-Doped Carbon Nanotube Array Encapsulating MxPy (M = Fe, Co, and Ni) Nanoparticles for High-Rate Potassium Storage

“…Furthermore, the sluggish reaction kinetics originating from poor conductivity is one of the main obstacles, which limits the practical application of TMP electrode materials in electrochemical energy storage . As the work proceeded, the researchers found that compositing TMP-based materials with carbon substrates (e.g., graphite, , carbon nanosheet, hollow nanotubes, , hollow nanocubes, and porous carbon , ) could cushion the structure collapse along with the volume changes of M x P y NPs during potassiation/depotassiation. Meanwhile, the conductive carbon materials could reinforce ion/electron transport processes to improve the reversibility of electrochemical reactions and then enhance the Coulombic efficiency and rate performance of the TMP-based materials.…”

Synthesis of Free‐Standing CoxP/Co3(PO4)2/C Composite Nanofiber Mats and Their Characteristics as Multi‐functional Interlayers for Lithium‐Sulfur Batteries

“…Generally, owing to their high electrical conductivities, [14] cobalt phosphides have found a broad potential application for energy storage devices and beyond, including hydrogen evolution, [15] oxygen evolution, [16] and overall water splitting, [17] supercapacitors, [18] zinc-air [19,20] and lithium-air batteries, [21] and Li-ion, Na-ion, and K-ion storage anode. [22][23][24] A combination of different cobalt phosphides (Co x P: CoP + Co 2 P) [25] with cobalt oxide (Co x P/CoO) [26] makes these materials multi-functional and improves their performance. On the other hand, the combined effect of the Co x P and Co 3 (PO 4 ) 2 on the electrochemical performance of lithium-sulfur batteries and polysulfide conversion mechanisms have not been studied yet.…”

Co 2 P/reduced graphene oxide nanocomposites and their multifunctional performances

“…For example, Yi Lu's group reported that the as‐prepared Ni 2 P/graphene composite had high cycle stability and rate performance [10] as an anode material for lithium‐ion (Li‐ion) batteries; Yun et al [11] prepared a series of supported nickel phosphide catalysts with different Ni/P molar ratios by a temperature‐programmed reduction, which displays the highest HDA activity as well as 99.0% of selectivity of decalin at 270°C. Cobalt phosphide (Co 2 P) is one of the transition‐metal phosphides, having lower lithium insertion potential, higher volumetric capacity and easily‐controlled surface area, which is a potential anode material for Li‐ion batteries and an excellent photocatalytic material [12, 13]. Compared to the single‐component counterparts, the graphene‐based metal phosphides have more amazing properties [14, 15], such as the reported graphene‐based Co 2 P composite [16], the effective combination of Co 2 P with reduced graphene oxide (RGO) nanosheets endows more enhanced performance in Li‐ion reversible capacity and cycleability.…”