Preparation and ionic conductive properties of all‐solid polymer electrolytes based on multiarm star block polymers

Abstract

A series of star block polymers with a hyperbranched core and 26 arms are successfully synthesized by atom transfer radical polymerization of styrene (St), and poly(ethylene glycol) methyl ether methacrylate from a hyperbranched polystyrene (HBPS) multifunctional initiator. All‐solid polymer electrolytes composed of these multiarm star polymers and lithium salts are prepared. The influences of polyoxyethylene (PEO) side‐chain length, PEO content, lithium salt concentration and type, and the structure of polymer on ionic conductivity are systematically investigated. The resulting polymer electrolyte with the longest PEO side chains exhibits the best ionic conductive properties. The maximum conductivity is 0.8 × 10−4 S cm−1 at 25°C with EO/Li = 30. All the prepared multiarm star block polymers possess good thermal stability. The mechanical property is greatly improved owing to the existence of polystyrene blocks in the multiarm star polymer molecules, and flexible films can be obtained by solution‐casting technique. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Structural and dielectric studies of amorphous and semicrystalline polymers blend‐based nanocomposite electrolytes

“…different methods of preparation (solution–cast, melt compounding, ultrasonic assisted, microwave irradiated, ion irradiated methods, etc. ), addition of liquid plasticizers, dispersion of inorganic nanofillers, use of different salts, and their blending with other polymers . These studies revealed that the addition of plasticizers always increased the degree of salt dissociation and the amorphous phase of the SPE materials, which resulted in the increase of their ionic conductivity.…”

“…In the last one decade, the solid polymeric electrolytes (SPEs) have been a topic of great technological interests because of their uses in the high power and high energy density storage lithium‐ion batteries . These batteries are the promising power sources for the modern portable electronic equipments and the electrical vehicles.…”

High voltage, solvent-free solid polymer electrolyte based on a star-comb PDLLA–PEG copolymer for lithium ion batteries

“…10 What's more, preparing multi-arm star-shaped copolymer with both rigid core and exible segment is another effective way to suppress crystallinity of SPE matrix, as well as to improve mechanical properties. [11][12][13] According to the pioneering work, star-shaped copolymers based SPEs usually show improved ambient conductivities ($10 À5 S cm À1 ). [11][12][13][14][15] As a bonus, the mechanical performance of the SPE lms can be improved signicantly by introducing the rigid component.…”

“…[11][12][13] According to the pioneering work, star-shaped copolymers based SPEs usually show improved ambient conductivities ($10 À5 S cm À1 ). [11][12][13][14][15] As a bonus, the mechanical performance of the SPE lms can be improved signicantly by introducing the rigid component. 12 Another widely studied polymer matrix for SPE is polyester, which has wide electrochemical window and high permittivity.…”

“…[11][12][13][14][15] As a bonus, the mechanical performance of the SPE lms can be improved signicantly by introducing the rigid component. 12 Another widely studied polymer matrix for SPE is polyester, which has wide electrochemical window and high permittivity. Brandell's group reported a exible poly(trimethylene carbonate) (PTMC)-based SPE with LiTFSI, of which the electrochemical window is up to 5.0 V (vs. Li/Li + ) and the ionic conductivity is in an order of 10 À7 S cm À1 at 60 C. 16 Chai et al fabricated a poly(vinylene carbonate) (PVC) based SPE by in situ polymerization, the electrochemical stability window and the ionic conductivity can reach 4.5 V (vs. Li/Li + ) and 9.8 Â 10 À5 S cm À1 at 50 C, respectively.…”