Direct determination of transference numbers of LiClO solutions in propylene carbonate and acetonitrile

Mauro, Vincenzo; D'Aprano, Alessandro; Croce, F.; Salomon, Mark

doi:10.1016/j.jpowsour.2004.09.015

Cited by 36 publications

(26 citation statements)

References 7 publications

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“…[36] Over the past decade, DFT and ab initio calculations on [Li(CH 3 CN) n ] + and related clusters were also performed by different groups. [30,[37][38][39][40] There has been a special interest in the properties of Li salts, such as conductivity, [41][42][43][44] transport abililty, [45][46][47] viscosity, [48] and osmotic behaviour [49] , in solvents and solvent mixtures because of the use of Li + ions in batteries of high energy density. [50] Such studies are not restricted to liquid systems.…”

Section: Introductionmentioning

confidence: 99%

Ligand‐Exchange Processes on Solvated Lithium Cations: Acetonitrile and Hydrogen Cyanide

et al. 2007

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Section: Introductionmentioning

confidence: 99%

Ligand‐Exchange Processes on Solvated Lithium Cations: Acetonitrile and Hydrogen Cyanide

et al. 2007

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“…This peak was, however, shifted to 25 C with significant decrease of ÁH m to 59 J g À1 upon the lithiation process, which convert the methacrylic acid to corresponding lithium methacrylate. This result strongly suggests that the crystallinity and/or degree of orientation of heptadecane side group were influenced strongly by presence of the lithium ion, which can be coordinated with ethylene oxide unit.…”

Section: Thermal Behaviormentioning

confidence: 97%

“…The current respond completely in phase to stepped potential and the result indicates that there was no active migration of counter anion thus no polarizations occur as shown in Figure 8. Comparing with salt-doped polymer electrolyte system which generally shows a significant polarization in a time frame of few second, 25 it is worth to notice that tethered counter anion to the polymer backbone is useful method to prevent undesired polarization thus guarantee a high lithium ion transference number.…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

Effect of Lithium Ion Concentration on Thermal Properties in Novel Single-Ion Polymer Electrolyte

Ryu

2008

Polym J

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Polymer electrolytes consist of heptadecane functionalized poly(ethylene oxide) (PEO) methacrylate and lithium methacrylate were prepared by radical copolymerization and neutralization. The polymer electrolyte was designed to have lithium ion conducting and crystalline domains into an inner-outer double cylinder like array by a macromonomer structure which results in interesting thermal behaviors. In fact, crystalline melting temperature of the heptadecane domain was found at 40 C but decreased gradually after introduction of lithium ions into the polymer electrolyte. The more the lithium ion concentration, the lower the melting temperature was observed in DSC study. This result suggests that the crystalline domain size of heptadecane became smaller and broader in their size and size distribution by increasing the lithium ion concentration. The polymer electrolytes reveal 2 Â 10 À7 S cm À1 of room temperature ionic conductivity due to the single-ion nature and quite low content ($38 wt %) of the conducting PEO domains. However it was found that there was no active migration of counter anion from the DC-polarization test which indicates a high lithium ion transference number of the polymer electrolyte.KEY WORDS: Macromonomer / Polymer Synthesis / Polymer Electrolyte / Heptadecane Crystalline / Single-ion / Polarization / Enhanced safety of portable electronic devices is one of the key concepts in recent lithium ion battery system by replacement of liquid electrolytes with less flammable polymer electrolytes. In addition to the safety issue, it is necessary to obtain several desired properties from a single polymer electrolytes such as a high ionic conductivities, good mechanical properties with a wide electrochemical stability window and high energy density and so on.1,2 For that reason, only a limited approach of the polymer electrolyte was reported in terms of several combined but not all of the properties. For example, poly(ethylene oxide) (PEO)-based gel polymer electrolytes exhibit the ionic conductivities as high as $10 À3 S cm À1 at room temperature but it can not be free from the corrosion or fire hazards arising from the liquid electrolytes. [3][4][5] As an alternative, solvent free non-crosslinked solid polymer electrolytes have been suggested and developed for several years but it still remains strong challenge due to the limited segmental motion of the polymer chain, thereby lowering ionic conductivity. 6Beside ionic conductivity and mechanical properties, the lithium ion transference number of the electrolyte has recently received a great deal of attention due to the increased demand for further performance gains. In a binary salt system, a gradient in salt concentration change both the lithium diffusion coefficient and the density of charge carriers across the electrolyte and leading to undesired polarization, which eventually reduces the capacity of the battery.7-9 Single-ion conductor by tethering the counter anion to the polymer backbone or immobilize in a matrix might be a good strategy to addre...

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“…However, the method was also successfully used with liquid nonpolymer electrolytes, where differences between electrolyte and charge transfer resistance are similarly large [25]. Moreover, this experimental approach was used in gel electrolytes, e.g.…”

Section: Lithium Transference Numbermentioning

confidence: 99%

Modern generation of polymer electrolytes based on lithium conductive imidazole salts

Niedzicki

Kasprzyk

Kuziak

et al. 2009

Journal of Power Sources

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Direct determination of transference numbers of LiClO solutions in propylene carbonate and acetonitrile

Cited by 36 publications

References 7 publications

Ligand‐Exchange Processes on Solvated Lithium Cations: Acetonitrile and Hydrogen Cyanide

Ligand‐Exchange Processes on Solvated Lithium Cations: Acetonitrile and Hydrogen Cyanide

Effect of Lithium Ion Concentration on Thermal Properties in Novel Single-Ion Polymer Electrolyte

Modern generation of polymer electrolytes based on lithium conductive imidazole salts

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