Phase behaviors of polymer blend(PEO–PPO) electrolyte/LiCF 3 SO 3 systems in lithium battery

Novel gel network polymer electrolytes containing fluorine and sulfonic acid lithium were prepared by the ultraviolet polymerization of poly(ethylene glycol) dimethyl acrylate, 2-acrylamido-2-methyl propanesulfonic acid, and trifluoroethyl methacrylate. The network polymer was activated with 1.0M LiPF 6 /ethylene carbonate/ dimethyl carbonate solutions (ethylene carbonate/dimethyl carbonate 5 1 : 1 v/v) to prepare gel network polymer electrolytes. The characteristics of the polymer networks, including the gel fractions, thermal stability, liquid electrolyte uptake, and electrochemical properties, were studied. When the poly(ethylene glycol) dimethylacrylate/2-acrylamido-2-methyl propanesulfonic acid/trifluoroethyl methacrylate weight ratio was 60 : 35 : 5, the network polymer electrolytes showed the highest liquid electrolyte uptake (144%) and ionic conductivity (ca. 10 23 S/cm) at room temperature (258C). The network polymer electrolytes were electrochemically stable up to 5.0 V versus Li 1 /Li. The excellent performances of the network polymer electrolytes suggest that they are suitable for application in high-performance lithium-ion batteries.

Section: Introductionmentioning

confidence: 99%

Novel network polymer electrolytes containing fluorine and sulfonic acid lithium prepared by ultraviolet polymerization

Chen

Wei

et al. 2008

“…In the formation of intercalated nanocomposites, the galleries of MMT layers are occupied by the polymeric structures . The intercalation occurs mainly due to favorable interactions compatibility between the functional group of polymer and the surface charge of MMT nanoplatelets.…”

Section: Resultsmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Choudhary

Sengwa

2014

The solid polymeric nanocomposite electrolyte (SPNE) films based on the blend of amorphous poly(methyl methacrylate) (PMMA) and semicrystalline poly(ethylene oxide) (PEO) (PMMA:PEO 5 80:20 wt %) doped with lithium perchlorate (LiClO 4 ) salt and montmorillonite (MMT) clay nanofiller were prepared by classical solution cast, ultrasonic assisted solution cast and ultrasonication along with microwave irradiated solution cast followed by melt-pressing methods. The X-ray diffraction study of these electrolytes revealed the amorphous behavior with intercalated MMT structures. The suppressed crystallinity of PEO in the blend electrolyte complexes confirmed the existence of single discrete PEO chains confined within the PMMA domains. The dielectric relaxation spectroscopy of these materials was performed over the frequency range 20 Hz to 1 MHz, at ambient temperature. The presence of a singular relaxation peak in the loss tangent and electric modulus spectra of these electrolytes confirms a coupled cooperative chain segmental dynamics of the blend polymer owing to their miscible amorphous morphology. The behavior of transient complexes formed between the polymers functional groups, lithium cations and the intercalated MMT nanoplatelets was explored. The ambient temperature ionic conductivity of these electrolytes depends on the structural dynamics and the sample preparation methods. It is revealed that the presence of PEO in the PMMA matrix mainly governs the structural, dielectric, and ionic properties of these SPNE films.

“Pore/bead” membrane for rechargeable lithium ion batteries

Feng

et al. 2012

A special “pore/bead” membrane was prepared with a mesoporous inorganic filler (MCM‐41) and a P(VDF‐HFP) binder. The special “pore/bead” structure of the MCM‐41 filler not only enhanced the puncture strength of the membrane but also improved its ionic conductivity. The puncture strength of the dried “pore/bead” membrane (MCM‐41 : P(VDF‐HFP) = 1 : 1.5) was 18 N, and showed a slight decrease (16 N) after the membrane was wetted by liquid electrolyte. Additionally, the composite membrane showed excellent thermal dimensional stability. The composite membrane could be activated by adding 1M LiClO4‐EC/DMC (1 : 1 by volume). The activated membrane displayed a high ionic conductivity about 3.4 × 10−3 S cm−1 at room temperature. Its electrochemical stability window was up to 5.3 V vs. Li/Li+, indicating that it was very suitable for lithium‐ion battery application. The battery assembled using the composite electrolyte also showed reasonably good high‐rate performance. The approach of preparing a “pore/bead” membrane provides a new avenue for improving both the conductivity and the mechanical strength of polymer electrolytes for lithium batteries. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013