Enhancement of the electrochemical performance of lithium-ion batteries by SiO@poly(2-acrylamido-2-methylpropanesulfonic acid) nanosphere addition into a polypropylene membrane.

Employing electrostatic self-assembly and free radical polymerization, the surface of SiO nanospheres was coated with poly(2-acrylamido-2-methylpropanesulfonic acid) (SiO@PAMPS) bearing strong electron withdrawing sulfonic and amide groups, enhancing the dissociation ability of the lithium salt of the liquid electrolyte and absorbing anions hydrogen bonds. After SiO@PAMPS nanospheres were introduced into the polypropylene (PP) membrane (SiO@PAMPS/PP), the electrolyte affinity and electrolyte uptake of the composite separators were significantly improved. The ionic conductivity of SiO@PAMPS/PP-18% (where 18% represents the concentration of the solution used for coating) soaked in liquid electrolyte was even 0.

Preparation and characterization of a novel positively charged composite hollow fiber nanofiltration membrane based on chitosan lactate.

A positively charged composite hollow fiber nanofiltration (NF) membrane was prepared interfacial polymerization (IP) between chitosan lactate (CL) and trimesoyl chloride (TMC) on a polyether sulfone (PES) hollow fiber ultrafiltration (UF) membrane. The chemical structure and the morphologies of the resultant NF membranes were characterized with attenuated total reflectance-infrared spectroscopy (ATR-IR) and scanning electron microscopy (SEM). The rejection of NF membrane for different inorganic salt aqueous solutions followed the order: MgCl > ZnCl > MgSO > NaCl > NaSO.