Crystallization-Induced Lamellar-to-Lamellar Thermal Transition in Salt-Containing Block Copolymer Electrolytes

Effect of heavy-ion on frequency selectivity of semiconducting polymer/electrolyte heterojunction

“…1(d)), although the ionic size of Nd 3+ increased greatly, demonstrating electrolyte crystallization with a chain-folding microstructure. 34 Compared with Li + and Mg 2+ doping, 30,35 the grain size of PEO-Nd 3+ was apparently smaller at a similar (ethylene oxide) EO : ion ratio, with a diameter of only about 100 mm on average, indicating much better nucleation in the PEO-Nd 3+ system. The microstructure was then examined in more detail by SEM and back-scattered electron imaging.…”

“…It has been reported that PEO-LiCF 3 SO 3 consists of crystalline PEO, crystalline polymer compound P(EO) 3 :LiCF 3 SO 3 , and an amorphous phase, among which the amorphous part is the primary contributor to the ionic conductivity. [30][31][32][33][34] Here the examined range was 15 to 30 , where MEH-PPV does not make any contribution. We found that both pure PEO-Nd 3+ and PEO-Nd 3+ on the MEH-PPV layer contained domains of crystalline PEO, as indicated by XRD peaks at 19.2 and 23.3 .…”

Block copolymer electrolytes for rechargeable lithium batteries

“…Most salt‐doping studies involving PEO (and PEO‐like) copolymers were investigated in the low salt concentration regime, analogous to [EO]:[Li] ratios ranging from 50:1 to 6:1. Several studies have shown that salt‐doping can change the morphologies and thermal properties of BCPs . For example, significant increases in the order‐disorder transition temperature ( T ODT ) were found in LiCF 3 SO 3 ‐doped poly(methyl methacrylate‐ b ‐oligooxyethylene methacrylate) (PMMA–POEM), LiClO 4 ‐doped poly(styrene‐ b ‐isoprene‐ b ‐ethylene oxide) (PS‐PI‐PEO), LiClO 4 ‐doped poly(isoprene‐ b ‐styrene‐ b ‐ethylene oxide) (PI‐PS‐PEO), and LiCF 3 SO 3 ‐doped poly(styrene‐ b ‐ethylene oxide) (PS‐PEO) systems relative to their neat polymer analogs (Fig.…”

“…These BCP electrolytes typically are based on the ion‐complexation (salt‐doping) behavior of ion conducting domain and the inherent nanoscale phase separation in BCPs . However, the complexation of salts with the solvating blocks of the BCPs can change the properties of the individual polymer domains and the overall copolymer morphology, thus impacting the ionic conductivity and mechanical strength of the nanostructured BCP electrolytes …”

Anisotropic ion transport in nanostructured solid polymer electrolytes

“…Introduction of lithium salt into the conducting domain signicantly inuences the phase behavior of the block copolymer and ultimately impacts the ionic conductivity of the SPE. 57,111,[122][123][124][125][126][127][128][129][130][131][132][133] The shi in phase behaviors in these block copolymer SPE systems is attributed to the change of Flory-Huggins interaction parameter (c) due to the introduction of the salt. The complexation between PEO chains and lithium ions typically results in an increased incompatibility between the PEO domain and the non-conducting domain, driving the phase separation towards the strong segregation region.…”