Electrical conductivities and Li ion concentration-dependent diffusivities, in polyurethane polymers doped with lithium trifluoromethanesulfonimide (LiTFSI) or lithium perchlorate (LiClO4)

Park

J of Applied Polymer Sci

et al. 2017

Polymer electrolytes are attractive for the applications in conventional electrochemical devices and emerging flexible devices. In this study, we developed a poly(urethane acrylate)‐based gel polymer electrolyte with excellent mechanical stability, optical transparency, and a high ionic conductivity. These polymer electrolytes showed excellent dimensional stability and an elastomer‐like behavior with a Shore A hardness in the range of 20–40. The optical transmittance values of these polymers films were over 80% in the visible range. Their ionic conductivities were controlled via changes in the concentration of the linker, dimethylol propionic acid (DMPA), and the lithium salt incorporated into the polymer. The maximum ionic conductivity reached 3.7 mS/cm at room temperature (∼23 °C) when the DMPA/poly(ethylene glycol) molar ratio was 0.25, and the ionic conductivity was found to be proportional to the salt concentration. We believe that these polymer electrolytes will be useful in various electrochemical applications where flexibility, high ionic conductivity, and transparency in the electrolytes are necessary. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45009.

Section: Introductionmentioning

confidence: 99%

Poly(urethane acrylate)‐based gel polymer films for mechanically stable, transparent, and highly conductive polymer electrolyte applications

Park

J of Applied Polymer Sci

et al. 2017

“…5, the ionic conductivity increases with temperature increase and the ionic conductivity of the membranes doped with molecular sieve is higher than the pure PVDF‐HFP membrane, whether it is modified by silane or not, which suggests that increase temperature lowering the activation energy for the ions transfer between the micropores in the polymer matrix can improve ionic conductivity and molecular sieves with their unique molecule space structure not only can provide more passageways for the ionic migration, but also as Lewis acid interact with polymer matrix to decrease the crystallinity degree for forming more amorphous areas. Furthermore, the ionic conductivity is not related linearly to the reciprocal temperature, which is different from the reported composite polymer electrolyte doped by some other inorganic fillers and maybe obeys the Vogel–Tamman–Fulcher (VTF) relation [35, 36]. As the temperature increases, the polymer can expand easily and produce free volume.…”

Section: Resultsmentioning

confidence: 67%

Properties on novel PVDF‐HFP‐based composite polymer electrolyte with vinyltrimethoxylsilane‐modified ZSM‐5

Xiao

Guo

et al. 2012

Polymer Composites

A kind of novel poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)-based composite polymer electrolyte doped with vinyltrimethoxylsilane (DB171 silane)-modified ZSM-5 is prepared by phase inversion method (denoted as M-ZSM-5 membrane). Physical and chemical properties of M-ZSM-5 membrane are studied by SEM, FTIR, TG-DSC, EIS, and LSV. The results show that thermal and electrochemical stability can reach 4008C and 5 V, respectively; temperature dependence of ionic conductivity follows Vogel-Tamman-Fulcher relation and ionic conductivity at room temperature is up to 4.2 mS/cm; the interfacial resistance reaches a stable value about 325 O after 5 days storage at room temperature, which suggests that it can be potentially suitable as electrolyte in polymer lithium ion battery. POLYM. COMPOS.,

J of Applied Polymer Sci

“…For SPEs with low salt content (like SPE5 and SPE10), the plot of the ionic conductivity against the reciprocal absolute temperature is linear, indicating that the conductivity of the polymer electrolyte obeys Arrhenius law . But, interestingly, it does not follow Arrhenius behavior strictly for the SPEs with a high salt content (like SPE15 and SPE20).…”

Section: Resultsmentioning

confidence: 98%

“…It is also clear that an increase in the lithium content can be correlated to the enhancement in conductivity (Figure ). This can be associated with an increased number of charge carriers . The ionic conductivity of the SPE15 and SPE20 can reach 5.44 × 10 −6 and 5.18 × 10 −6 S cm −1 at 40 °C then increase to 2.35 ×10 −3 and 2.77 × 10 −3 S·cm −1 at 140 °C.…”

Section: Resultsmentioning

confidence: 99%

Solid polymer electrolyte based on waterborne polyurethane for all‐solid‐state lithium ion batteries

Bao

Tao

et al. 2017

A series of solid polymer electrolytes (SPEs) based on comb-like nonionic waterborne polyurethane (NWPU) and LiClO 4 are fabricated via a solvent free process. The NWPU-based SPEs have sufficient mechanical strength which is beneficial to their dimensional stability. Differential scanning calorimetry analysis indicates that the phase separation occurs by the addition of the lithium salt. Scanning electron microscopy and X-ray diffraction analyses illustrate the good compatibility between LiClO 4 and NWPU. Fourier transform infrared study reveals the complicated interactions among lithium ions with the amide, carbonyl and ether groups in such SPEs. AC impedance spectroscopy shows the conductivity of the SPEs exhibiting a linear Arrhenius relationship with temperature. The ionic conductivity of the SPE with the mass content of 15% LiClO 4 (SPE15) can reach 5.44 3 10 26 S cm 21 at 40 8C and 2.35 310 23 S cm 21 at 140 8C. The SPE15 possesses a wide electrochemical stability window of 0-5 V (vs. Li1/Li) and thermal stability at 140 8C. The excellent properties of this new NWPU-based SPE are a promising solid electrolyte candidate for all-solid-state lithium ion batteries.Recently, polyurethane (PU) has received great attention as a promising host polymer for a gel polymer electrolyte, 19-21 wearable batteries, 22 and SPE. [23][24][25] The interest in using PU as a SPE matrix is related to its chemical structure because PU is composed of a soft segment (polyether or polyester) and a hard Additional Supporting Information may be found in the online version of this article.