Solid polymer electrolytes based on cross-linked polysiloxane-g-oligo(ethylene oxide): ionic conductivity and electrochemical properties

Kang, Yongku; Lee, Wonsil; Suh, Dong Hack; Lee, Changjin

doi:10.1016/s0378-7753(03)00189-7

Cited by 68 publications

(47 citation statements)

References 18 publications

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“…The selected prefactors conductivity σ 0 for all polymer electrolytes were very close to the values measured by many authors (Khiar and Arof, 2011;Gong et al, 2008;Kang and Fang, 2004;Rajendran et al, 2003;Kang et al, 2003;Xu et al, 2001). We also see that the fraction of amorphous state increases with the ion concentration and mostly saturates at high ion concentration.…”

Section: Discussionsupporting

confidence: 88%

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A General Formula for Ion Concentration-Dependent Electrical Conductivities in Polymer Electrolytes

Aji¹

2012

American Journal of Applied Sciences

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Problem statement:The aim of this study is to develop a model for describing the effect of ion concentration on the electrical conductivity of polymer electrolytes by considering two mechanisms simultaneously: Enhancements of ion concentration and amorphous phase. Approach: The problems based on new observations in polymer electrolyte when ion concentration in the polymer electrolytes was increased, both the fraction of amorphous phase and the charge carriers increase simultaneously. The model was based on the assumption when ions were inserted into the polymer host, there was an optimum distance between ions at which the ions move easily throughout the polymer. The average distance between ions in the polymer depends on the ion concentration. And we also considered the effect of ion concentration on the amorphous phase in the polymer. Results: We inspected the validity of the model by comparing the model predictions with various experimental data. The new analytical expressions for the electrical conductivity dependent of ion concentration was developed by considering two mechanisms simultaneously in polymer electrolytes, i.e., enhancement of the carries concentration and amorphous phase fraction. Interestingly, most of fitting parameters were not arbitrarily selected, but were derived from the appropriate experimental data. Conclusion: The model can be used to explain the conductivity behavior of other polymer electrolyte systems by selecting appropriately less number of parameters. This model result is fully supported by available experimental data.

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Section: Discussionsupporting

confidence: 88%

“…The conductivity initially increases with ion concentration, reaches the maximum at a certain concentration after which it turns down at high ion concentrations (Khiar and Arof, 2011;Gong et al, 2008;Kang and Fang, 2004;Rajendran et al, 2003;Kang et al, 2003;Xu et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

A General Formula for Ion Concentration-Dependent Electrical Conductivities in Polymer Electrolytes

Aji¹

2012

American Journal of Applied Sciences

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“…In the last two decades, further investigations on poly-and cyclosiloxane based polymer electrolytes have shown that this is a promising class of polymer electrolytes with good electrochemical stability as well as good ionic conductivities [9,15,[23][24][25][26][27]. A further advantage is the ease of chemical modification and the possibility of integrating polysiloxanes in copolymers and hybrid materials [9,15,[23][24][25][26][27][28]. Such graft-copolymers can reach conductivities up to 10 −4 S cm −1 at room temperature, which represented a big step from PEO based materials at that time.…”

Section: Introductionmentioning

confidence: 99%

Transport Mechanisms of Ions in Graft-Copolymer Based Salt-in-Polymer Electrolytes

Kunze

Schulz

Wiemhöfer

et al. 2010

Zeitschrift Für Physikalische Chemie

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Polymer Electrolyte / Nuclear Magnetic Resonance / Spin Relaxation / Pulsed Field Gradient NMR / ConductivitySalt-in-polymer electrolytes based on graft copolymers with oligoether side chains and added LiCF 3 SO 3 (LiTf) are investigated concerning the transport and dynamics of the ionic species with respect to applications as Li ion conductors. Polymer architectures are based on polysiloxane or polyphosphazene backbones with one or two side chains per monomer, respectively. NMR methods provide information about molecular dynamics on different length scales: The mechanisms governing local dynamics and long range mass transport are studied on the basis of temperature dependent spin-lattice relaxation rates and pulsed field gradient diffusion measurements for 7 Li, 19 F and 1 H, respectively. The correlation times characterizing local ion dynamics reflect the complexation of the cations by the oligoether side chains of the polymer.7 Li and 19 F diffusion coefficients and their activation energies are rather similar, suggesting the formation of ion pairs and clusters with similar activation barriers for cation and/or anion long-range transport. Activation energies of local reorientations are generally significantly smaller than activation energies of long range diffusion. Long range transport is affected by (1) the coupling of conformational side chain reorientations to the cation movement, and (2) the correlated diffusion of cations and anions within ion pairs. Ion pairs and their dissociation play a major role in controlling the resulting conductivity of the material. Guidelines for material optimization in terms of a maximized conductivity can thus be derived by identifying a compromise between high ionic mobility and good Li complexation by the coordinating side chains.

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“…These three disadvantages are serious problems for NB, which require security of data, power economy and high efficiency. Kang et al, (2003) suggest that solid state disks take less space, are light weight, minimize energy consumption and quickly store and fetch data. In addition, they are highly reliable.…”

Section: Solid State Disk (Ssd)mentioning

confidence: 99%

Optimization of product line design for environmentally conscious technologies in notebook industry

Lin

Shih

Lee

2010

Int. J. Environ. Sci. Technol.

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Promotion of green technologies related to notebook computer will have significant benefits in the environment. Notebook companies need to make a careful market assessment for green technologies. Due to the variety of consumer preferences for green technologies, as well as a hot competitive climate in notebook market, consumer preferences should be taken into consideration during the assessment process. This study classifies the green technologies of notebook industry. Some green technologies are not controlled by the environmental regulations but are popular among customers. This study named this kind of technologies niche green technologies. The product line design model can evaluate the design scheme based on customer preferences. Therefore, this study uses conjoin analysis to investigate the consumers' preferences for assorted technology. Subsequently, product line design model is utilized to seek the optimal scheme of niche green technologies adoption based on the consumers' preference. Results of conjoint analysis reveal that consumers value two attributes, including price and size. Furthermore, the preferences for niche green technologies in solid state drive disk and light emitting diode backlight surpass the former technology. After the assessment of market situation with product line design model, two types of niche green technologies, including lithium polymer battery and light emitting diode backlight are suggested for the adoption of new products design.

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Solid polymer electrolytes based on cross-linked polysiloxane-g-oligo(ethylene oxide): ionic conductivity and electrochemical properties

Cited by 68 publications

References 18 publications

A General Formula for Ion Concentration-Dependent Electrical Conductivities in Polymer Electrolytes

A General Formula for Ion Concentration-Dependent Electrical Conductivities in Polymer Electrolytes

Transport Mechanisms of Ions in Graft-Copolymer Based Salt-in-Polymer Electrolytes

Optimization of product line design for environmentally conscious technologies in notebook industry

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