Polyimide-polyether mixed conductors as switchable materials for electrochromic devices

Redox-active polyimide–polyether block copolymers as electrode materials for lithium batteries

“…Polyimides were synthesized by simple polycondensation reaction from dianhydrides and diamines. 19,27 PEO based diamines (5 mmol) were dissolved in anhydrous N,N-dimethylacetamide in a 100 mL three-necked ask blanketed with nitrogen. Aerwards, stoichiometric amount of dianhydride (5 mmol) was added and stirred overnight at room temperature.…”

“…Polyimide-polyether block copolymers were investigated before as electrochromic devices 19 and gas separation membranes. 27 Using a similar synthetic pathway, polyimides-polyether multiblock copolymers were synthesized by a polycondensation reaction of stoichiometric quantities of diamine (PEO600, PEO900, PEO2000) and dianhydride (pyromellitic-PMDA and naphthalene-NTDA) in two steps via an intermediate polyamic acid.…”

“…18 It has also been demonstrated that a positive shi in the reduction potential is achieved by increasing the ring size of the imide. 3,19 It has been reported that voltages of polyimides are more associated with the active group, which is the dianhydride component, rather than with the diamine. 10,32 The same behaviour was observed for these PI-PEO block copolymers.…”

“…However, naphthalene polyimides tend to merge into a broader two-electron peak. 19 Reduction potentials for naphthalene polyimide-b-PEO2000 were 2.1 V and 2.3 V, whereas oxidations peaks were 2.8 V and 2.9 V. Further comparison between samples based on different dianhydrides, pyromellitic polyimide-b-PEO600 and naphthalene polyimide-b-PEO600, was carried out by galvanostatic charge-discharge. Cycling performances of both samples are presented in Fig.…”

“…In 2010, several groups started to look again to polyimides because of its excellent performance as active materials for rechargeable lithium batteries due to their outstanding thermal stability and mechanical strength. 10,[18][19][20] Thus, polyimides derived from 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) exhibited a discharge voltage of 2.35 V vs. Li + /Li and a discharge capacity of 110 mA h g À1 cycled at 50 mA g À1 current density. 5 Due to their low solubility and electrical conductivity, different conductive additives have been used with a POLYMAT, University of the Basque Country UPV/EHU, Joxe Mari Korta Centre, Avda.…”