PEO-LiN(SO[sub 2]CF[sub 2]CF[sub 3])[sub 2] Polymer Electrolytes: I. XRD, DSC, and Ionic Conductivity Characterization

Appetecchi, G. B.; Henderson, Wesley A.; Villano, P.; Berrettoni, Mario; Passerini, Stefano

doi:10.1149/1.1403728

Cited by 123 publications

(130 citation statements)

References 26 publications

Supporting

Mentioning

121

Contrasting

Order By: Relevance

“…(The thermal scans were run after subjecting the samples to the same protocol adopted for obtain- ing the blue trace in Figure 2.) It is to note the plasticizing effect due to large counter ion lithium salts as LiTFSI salt, 12 leading to broader (endothermic) melting peak shifted from 65 to 59…”

Section: Resultsmentioning

confidence: 99%

“…From Figure 4A it is evidenced a progressive reduction of the electrolyte resistance during the initial period of storage whereas no further decrease is noticed after three days, e.g., identical bulk resistance values are found even upon very prolonged storage times (17 months). All PEO-based electrolytes (with the exception of the ionic liquid-free sample, likely due to slow crystallization kinetics of the PEO host in presence of large lithium salt counter ions) 12 exhibited analogous behavior, e.g., an initial impedance decrease followed by time-stable resistance values. This means progressive increase in conductivity (depending of the inverse of the electrolyte resistance) during the initial storage period to leveling around time-stable values.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Highly Conductive, Ionic Liquid-Based Polymer Electrolytes

Simonetti

Carewska

Maresca

et al. 2016

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

In this manuscript is reported a thermal and impedance spectroscopy investigation carried out on quaternary polymer electrolytes, to be addressed as separators for lithium solid polymer batteries, containing large amount of the N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide ionic liquid. The target is the development of Li + conducting membranes with enhanced ion transport even below room temperature. Polyethylene oxide and polymethyl methacrylate were selected as the polymeric hosts. A fully dry, solvent-free procedure was followed for the preparation of the polymer electrolytes, which were seen to be self-consistent and handled even upon prolonged storage periods (more than 1 year). Appealing ionic conductivities were observed especially for the PEO electrolytes, i.e., 1.6 × 10 −3 and 1.5 × 10 −4 S cm −1 were reached at 20 and −20 • C, respectively, which are ones the best, if not the best ion conduction, never detected for polymer electrolytes. Lithium polymer batteries (LPBs) are considered excellent candidates for the next generation power sources because they combine high energy density and flexible characteristics with the safety issue of the solvent-free electrolytes.1 Nevertheless, the performance of LPBs is limited by the low ionic conductivity of the solvent-free polymer electrolytes at room temperature as the polymeric host is manly crystalline (i.e., resulting in slow motion of the Li + active specie). 2For instance, polyethylene oxide-(PEO) based electrolytes exhibit suitable conduction values (≥10 −4 S cm −1 ) for practical applications only above 65• C, e.g., where the amorphous phase is predominant and allows remarkably higher mobility to the lithium ions.3-5 Therefore, several approaches 6 were attempted aiming to decrease the content of crystalline phase (particularly, P(EO) 6 LiX) 3-5 in polymer electrolytes, e.g., branched and/or cross-linked hosts, blended polymer matrices, large counter anion lithium salts, addition of additives (organic compounds, oligomers, ceramic fillers).One of the most promising approaches is represented by the incorporation of ionic liquids (ILs) into the polymer electrolytes. 6 In the last years it was successfully demonstrated 6 that incorporation of N-alkyl-N-methylpyrrolidinium (PYR 1A , where the subscripts indicate the number of carbon atoms of the pyrrolidinium cation alkyl chains) perfluorosulfonylimide (PFSI) ILs enhances the room temperature ionic conductivity of solid polymer electrolytes (SPEs) above 10 −4 Scm −1 and improves the compatibility with respect to the lithium anode.However, faster ion transport properties are needed, especially in devices (operating at high current rates) for applications (i.e., automotive) requiring higher power density values. In the frame of the MARS-EV project 7 we have properly designed and developed SPEs based on PEO and polymethyl methacrylate (PMMA), i.e., considered ones of the most suitable materials as host for polymer electrolytes, 6 and incorporating large fraction of N-methyl-N-propylpyrrolidinium bis(f...

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Highly Conductive, Ionic Liquid-Based Polymer Electrolytes

Simonetti

Carewska

Maresca

et al. 2016

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…An alternating current (AC) perturbation of 10 mV was applied to the cell. The electrolyte resistance was determined from the high frequency intercept of the impedance spectrum with the real axis and converted first to resistivity by normalizing resistance to the area and thickness of electrolyte-infiltrated monolithic 3DOM carbon, and then to ionic conductivity, the reciprocal of ionic resistivity [76,77]. …”

Section: Full Papermentioning

confidence: 99%

Synthesis and Rate Performance of Monolithic Macroporous Carbon Electrodes for Lithium-Ion Secondary Batteries

et al. 2005

View full text Add to dashboard Cite

Three‐dimensionally ordered macroporous (3DOM) materials are composed of well‐interconnected pore and wall structures with wall thicknesses of a few tens of nanometers. These characteristics can be applied to enhance the rate performance of lithium‐ion secondary batteries. 3DOM monoliths of hard carbon have been synthesized via a resorcinol‐formaldehyde sol–gel process using poly(methyl methacrylate) colloidal‐crystal templates, and the rate performance of 3DOM carbon electrodes for lithium‐ion secondary batteries has been evaluated. The advantages of monolithic 3DOM carbon electrodes are: 1) solid‐state diffusion lengths for lithium ions of the order of a few tens of nanometers, 2) a large number of active sites for charge‐transfer reactions because of the material's high surface area, 3) reasonable electrical conductivity of 3DOM carbon due to a well‐interconnected wall structure, 4) high ionic conductivity of the electrolyte within the 3DOM carbon matrix, and 5) no need for a binder and/or a conducting agent. These factors lead to significantly improved rate performance compared to a similar but non‐templated carbon electrode and compared to an electrode prepared from spherical carbon with binder. To increase the energy density of 3DOM carbon, tin oxide nanoparticles have been coated on the surface of 3DOM carbon by thermal decomposition of tin sulfate, because the specific capacity of tin oxide is larger than that of carbon. The initial specific capacity of SnO2‐coated 3DOM carbon increases compared to that of 3DOM carbon, resulting in a higher energy density of the modified 3DOM carbon. However, the specific capacity decreases as cycling proceeds, apparently because lithium–tin alloy nanoparticles were detached from the carbon support by volume changes during charge–discharge processes. The rate performance of SnO2‐coated 3DOM carbon is improved compared to 3DOM carbon.

show abstract

“…Although recent work by Zhang et al and Gadjourova at el. demonstrated that ion conduction is possible in crystalline polymers [33,34], the majority of the previous studies focused on the amorphous phase, where ion transport is dependent on the segmental motion of the polymer chains [35][36][37][38][39][40]. When lithium salts are introduced to the polymer matrix forming PEO/LiX complexes, the oxygen atoms from both the PEO chains and the anions coordinate the lithium ions [41].…”

Section: Introductionmentioning

confidence: 99%