7Li NMR, ionic conductivity and self-diffusion coefficients of lithium ion and solvent of plasticized organic–inorganic hybrid electrolyte based on PPG-PEG-PPG diamine and alkoxysilanes

2006 ◽  
Vol 52 (3) ◽  
pp. 1015-1027 ◽  
Author(s):  
Hsien-Ming Kao ◽  
Pai-Ching Chang ◽  
Shih-Wei Chao ◽  
Chiou-Hwang Lee
Keyword(s):  
Ionic Conductivity ◽  
Diffusion Coefficients ◽  
Lithium Ion ◽  
Inorganic Hybrid ◽  
Self Diffusion ◽  
7Li Nmr

A new organic–inorganic hybrid electrolyte based on polyacrylonitrile, polyether diamine and alkoxysilanes for lithium ion batteries: synthesis, structural properties, and electrochemical characterization

RSC Advances ◽  
2014 ◽  
Vol 4 (26) ◽  
pp. 13293-13303 ◽  
Author(s):  
Yu-Chi Pan ◽  
Diganta Saikia ◽  
Jason Fang ◽  
Li-Duan Tsai ◽  
George T. K. Fey ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Structural Properties ◽  
Discharge Capacity ◽  
Lithium Ion ◽  
Electrochemical Characterization ◽  
Initial Discharge Capacity ◽  
Inorganic Hybrid ◽  
Initial Discharge

The plasticized hybrid electrolyte exhibits a maximum ionic conductivity of 6.4 mS cm−1 at 30 °C and an initial discharge capacity of 123 mA h g−1 in battery testing.

scholarly journals Poly(ionic liquid) Based Composite Electrolytes for Lithium Ion Batteries

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4469
Author(s):  
Robert Löwe ◽  
Thomas Hanemann ◽  
Tatiana Zinkevich ◽  
Andreas Hofmann
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Ionic Conductivity ◽  
Lithium Ion Batteries ◽  
Polymer Electrolyte ◽  
Diffusion Coefficients ◽  
Lithium Ion ◽  
Liquid Electrolyte ◽  
Resonance Spectroscopy ◽  
Electrolyte Membranes

Polymerized ionic liquids (PIL) are an interesting substance class, which is discussed to transfer the outstanding properties and tunability of ionic liquids into a solid material. In this study we extend our previous research on ammonium based PIL and discuss the influence of additives and their usability as polymer electrolyte membranes for lithium ion batteries. The polymer electrolyte is thereby used as replacement for the commercially widespread system of a separator that is soaked with liquid electrolyte. The influence of the material composition on the ionic conductivity (via electrochemical impedance spectroscopy) and the diffusion coefficients (via pulsed-field-gradient nuclear magnetic resonance spectroscopy) were studied and cell tests with adapted membrane materials were performed. High amounts of the additional ionic liquid (IL) MPPyrr-TFSI (1-methyl-1-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide) increased the ionic conductivity of the materials up to 1.3·10−4 S·cm−1 but made the usage of a cross-linker necessary to obtain mechanically stable membranes. The application of liquid electrolyte mixtures with ethylene carbonate (EC) and MPPyrr-TFSI decreased ionic conductivity values down to the 10−9 S·cm−1 range, but increased 7Li diffusion coefficients with increasing amounts of EC up to 1.7·10−10 m2·s−1. Cell tests with two membrane mixtures proofed that it is possible to build electrolyte membranes on basis of the polymerized ionic liquids, but also showed that further research is necessary to ensure stable and efficient cell cycling.

scholarly journals Theoretical Modelling of Ion Exchange Processes in Glass: Advances and Challenges

2021 ◽  
Vol 11 (11) ◽  
pp. 5070
Author(s):  
Xesús Prieto-Blanco ◽  
Carlos Montero-Orille
Keyword(s):  
Ion Exchange ◽  
Diffusion Coefficients ◽  
Molten Salts ◽  
Theoretical Modelling ◽  
Copper Films ◽  
Theoretical Frameworks ◽  
Self Diffusion ◽  
Exchange Processes ◽  
The One ◽  
Made In

In the last few years, some advances have been made in the theoretical modelling of ion exchange processes in glass. On the one hand, the equations that describe the evolution of the cation concentration were rewritten in a more rigorous manner. This was made into two theoretical frameworks. In the first one, the self-diffusion coefficients were assumed to be constant, whereas, in the second one, a more realistic cation behaviour was considered by taking into account the so-called mixed ion effect. Along with these equations, the boundary conditions for the usual ion exchange processes from molten salts, silver and copper films and metallic cathodes were accordingly established. On the other hand, the modelling of some ion exchange processes that have attracted a great deal of attention in recent years, including glass poling, electro-diffusion of multivalent metals and the formation/dissolution of silver nanoparticles, has been addressed. In such processes, the usual approximations that are made in ion exchange modelling are not always valid. An overview of the progress made and the remaining challenges in the modelling of these unique processes is provided at the end of this review.

scholarly journals Self-Diffusion Coefficients, Aggregation Numbers and the Range of Existence of Spherical Micelles of Oxyethylated Alkylphenols

2021 ◽  
Author(s):  
Victor P. Arkhipov ◽  
Natalia A. Kuzina ◽  
Andrei Filippov
Keyword(s):  
Aqueous Solutions ◽  
Diffusion Coefficients ◽  
The Self ◽  
Self Diffusion ◽  
Aggregation Numbers ◽  
Temperature Ranges ◽  
Spherical Micelles ◽  
Limiting Values

AbstractAggregation numbers were calculated based on measurements of the self-diffusion coefficients, the effective hydrodynamic radii of micelles and aggregates of oxyethylated alkylphenols in aqueous solutions. On the assumption that the radii of spherical micelles are equal to the lengths of fully extended neonol molecules, the limiting values of aggregation numbers corresponding to spherically shaped neonol micelles were calculated. The concentration and temperature ranges under which spherical micelles of neonols are formed were determined.

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