Poly(aryl ether ketone) composite membrane as a high‐performance lithium‐ion batteries separator

Abstract

We described the design and synthesis of a modified poly(aryl ether ketone) bearing phenolphthalein and allyl groups (P-PAEK) via nucleophilic polycondensation. A new kind of composite separator, crosslinked P-PAEK/polyvinylidene fluoride (c-P-PAEK/PVDF) membrane was successfully prepared using phase separation, phase inversion method, and UV crosslinking technique. As a separator of lithium-ion battery, c-P-PAEK/PVDF membrane demonstrates high porosity and uniform distribution of pores with interconnected pathways. Low thermal shrinkage, distinct shut-down effect, high liquid electrolyte uptake capacity, and exciting liquid electrolyte wettability of the prepared c-P-PAEK/PVDF membrane have been revealed through comprehensive study. Moreover, the c-P-PAEK/PVDF membrane was applied to assemble a conventional Li/LiFePO 4 coin cell, which exhibited hopeful cell performance.

Polymers for advanced lithium-ion batteries: State of the art and future needs on polymers for the different battery components

“…Poly(aryl ether ketone) (PAEK), a family of semi-crystalline thermoplastics that presents an excellent thermal oxidative stability, good mechanical properties and good chemical stability [353], has been used as separator material in LIBs [354,355]. The aromatic main chains provide excellent thermal and mechanical stability, while the polar ether/ketone groups strongly interact with carbonate electrolytes, resulting in improved power densities.…”

Polyaryletherketone in energy conversion and storage devices – a highly tailorable material with versatile properties

“…However, the advancements in membrane casting methods and the highly tunable morphology of PAEKs have improved their potential as a material of interest for energy storage. The flexibility in the membrane preparation method, crystallization control and easy functionalization provides a significant edge for PEEK over other traditionally used materials 23,93,94 . The ability to be fabricated into a highly porous structure improves the wettability and electrolyte uptake in the range of ca 250% and ca 500%, respectively 95,96 …”

Preparation and properties of gel‐filled PVDF separators for lithium ion cells

“…Microporous polymer electrolyte is one of the most promising ways to improve the ionic conductivity and electrochemical properties of electrolyte separator in lithium cells. Polymers such as poly(vinylidene fluoride) (PVDF), poly(aryl ether ketone) (PAEK), polyacrylonitrile (PAN), polyimide (PI), poly(methyl methacrylate) (PMMA), poly(ethylene oxide) (PEO), and polyvinyl chloride (PVC) have been studied in polymer electrolytes. PVDF draw a great attention on account of its excellent appealing properties, such as mechanical strength, high chemical resistance, good thermal stability, higher dielectric constant (ε ≈ 8.4), and strongly electro‐withdrawing functional groups (CF).…”