Preparation of LiNi0·6Co0·2Mn0·2O2 by PVP modified liquid-phase assisted solid-phase method and its electrochemical energy storage performance

PVP-Assisted Hydrothermal Synthesis of Nickel-Rich Cobalt-Free Single-Crystal LiNi0.9Mn0.05Al0.05O2 for Lithium-Ion Batteries

“…38 (3) PVP colloids in aqueous solution form a double electric layer on the outer surface, with the outer layer's charge repelling each other due to electrostatic effects, preventing the precursor from getting close together. 21,38 (4) With the addition of PVP, the dispersed precursor particles avoid spatial compression from surrounding particles during crystalline growth in the calcination and crystallization process, enabling the single-crystal particles to grow freely. 39 Consequently, the single-crystal particles exhibit a more ordered lamellar structure and a larger cell volume, as confirmed by XRD refinement results.…”

“…After calcination, the P-NMA sample lacking PVP maintains the precursor morphology with primary particles accumulating to form irregularly agglomerated secondary particles (Figure 2c), while the S-NMA sample with added PVP forms single-crystal particles of approximately 1 μm (Figure 2d). This is primarily due to PVP serving as a spatial barrier, 21 forming an isolating layer that prevents particle aggregation, resulting in a dispersed precursor. After calcination, a single-crystalline cathode material with uniformly dispersed particles is produced.…”

“…36 Simultaneously, the spatial coiling of PVP's polymer long chain acts as spatial site resistance, dispersing precursor particles and preventing agglomeration. 21,37 (2) PVP adsorption on the precursor surface reduces its surface energy, resulting in monodisperse particles with low surface energy, preventing the reagglomeration of precursor particles into secondary particles. 38 (3) PVP colloids in aqueous solution form a double electric layer on the outer surface, with the outer layer's charge repelling each other due to electrostatic effects, preventing the precursor from getting close together.…”

Near-Infrared-Driven β-NaYF4:Yb,Tm,Gd/Ni-MOF Nanocomposites for Efficient Sterilization and Degradation of Organic Contaminants

“…The solvothermal synthesis method yielded OA-UCNRs with a measured zeta potential of +26.15 mV (Figure S1), which can be attributed to the exposure of the long alkyl hydrophobic chains of OA during the procedure of formation, thus making the OA-UCNRs hydrophobic and positively charged . On the flip side, a substantial decrease in potential to −13.50 mV was observed for PVP-UCNRs, which can be attributed to the replacement of the −COO– group on the long chain of OA located on the nanorods’ surface by the C=O and O–H groups on the pyrrolidone ring during the amendment procedure . This indicates that PVP-UCNRs were successfully modified to be hydrophilic.…”

“…32 On the flip side, a substantial decrease in potential to −13.50 mV was observed for PVP-UCNRs, which can be attributed to the replacement of the −COO− group on the long chain of OA located on the nanorods' surface by the C=O and O−H groups on the pyrrolidone ring during the amendment procedure. 33 This indicates that PVP-UCNRs were successfully modified to be hydrophilic. The prepared Ni-MOF displays a potential value of +22.44 mV, while the synthesized UNM nanocomposites exhibit a potential value of +3.01 mV.…”