scholarly journals The Effects of Magnetic Field Alignment on Lithium Ion Transport in a Polymer Electrolyte Membrane with Lamellar Morphology

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 887 ◽  
Author(s):  
Pawel W. Majewski ◽  
Manesh Gopinadhan ◽  
Chinedum O. Osuji
Keyword(s):  
Polymer Electrolyte ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Microphase Separation ◽  
Polymer Electrolyte Membrane ◽  
Orientational Order ◽  
Lithium Ion ◽  
Transport Pathways ◽  
Impact Performance ◽  
Disorder Phase Transition

The transport properties of block copolymer-derived polymer electrolyte membranes (PEMs) are sensitive to microstructural disorder originating in the randomly oriented microdomains produced during uncontrolled self-assembly by microphase separation. This microstructural disorder can negatively impact performance due to the presence of conductivity-impeding grain boundaries and the resulting tortuosity of transport pathways. We use magnetic fields to control the orientational order of Li-doped lamellar polyethylene oxide (PEO) microdomains in a liquid crystalline diblock copolymer over large length scales (>3 mm). Microdomain alignment results in an increase in the conductivity of the membrane, but the improvement relative to non-aligned samples is modest, and limited to roughly 50% in the best cases. This limited increase is in stark contrast to the order of magnitude improvement observed for magnetically aligned cylindrical microdomains of PEO. Further, the temperature dependence of the conductivity of lamellar microdomains is seemingly insensitive to the order-disorder phase transition, again in marked contrast to the behavior of cylinder-forming materials. The data are confronted with theoretical predictions of the microstructural model developed by Sax and Ottino. The disparity between the conductivity enhancements obtained by domain alignment of cylindrical and lamellar systems is rationalized in terms of the comparative ease of percolation due to the intersection of randomly oriented lamellar domains (2D sheets) versus the quasi-1D cylindrical domains. These results have important implications for the development of methods to maximize PEM conductivity in electrochemical devices, including batteries.

Chemically directed self-assembly of perpendicularly aligned cylinders by a liquid crystalline block copolymer

2015 ◽  
Vol 3 (12) ◽  
pp. 2837-2847 ◽  
Author(s):  
N. Yamashita ◽  
S. Watanabe ◽  
K. Nagai ◽  
M. Komura ◽  
T. Iyoda ◽  
...  
Keyword(s):  
Thin Film ◽  
Block Copolymer ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Microphase Separation ◽  
Thermally Induced ◽  
Multiplication Process

Chemical epitaxy with a density multiplication process was applied to the perpendicularly oriented hexagonal cylinder nanostructure of liquid crystalline block copolymer (PEO-b-PMA(Az)) thin film through thermally induced microphase separation by using a newly designed PMA(Az)24 brush.

scholarly journals PERFORMANCE STUDY OF LiBOB/LiTFSI ELECTROLYTE SALT IN THE ALL-SOLID-STATE LITHIUM-ION BATTERY

2020 ◽  
Vol 21 (3) ◽  
pp. 102
Author(s):  
Christin Ratri ◽  
Titik Lestariningsih ◽  
Qolby Sabrina
Keyword(s):  
Lithium Ion Battery ◽  
Polymer Electrolyte ◽  
Electrode Materials ◽  
Polymer Electrolyte Membrane ◽  
Lithium Ion ◽  
Solid Polymer ◽  
Performance Study ◽  
Battery Cell ◽  
Current Output ◽  
Electrolyte Membrane

PERFORMANCE STUDY OF LiBOB/LiTFSI ELECTROLYTE SALT IN THE ALL-SOLIDSTATE LITHIUM-ION BATTERY. Solid polymer electrolyte is developed mainly to provide safer lithiumion battery upon high temperature operation. In this research, we employ LiBOB and LiTFSI electrolyte salt in various concentration to replace commercially used LiPF6 salt. Solution cast method was performed to produce polymer electrolyte membrane. PVdF-HFP was chosen as polymer matrix due to high dielectric constant, and compatibility to wide array of electrode materials as well as electrolyte salts. Higher amount of electrolyte salts contributes to thicker membrane and hence higher current output of the lithium-ion battery half-cells. SEM, FT-IR spectroscopy, and cyclic voltammetry measurement was conducted to evaluate li-ion battery cell performance. Between the two electrolyte salts used in this experiment, LiTFSI salt exhibited better performance compared to LiBOB.

Study on the Surface Morphology of PVdF-LiBOB Solid Polymer Electrolyte with TiO2 Filler for Lithium-Ion Battery Application

2016 ◽  
Vol 864 ◽  
pp. 159-162 ◽  
Author(s):  
Christin Rina Ratri ◽  
Qolby Sabrina
Keyword(s):  
Ionic Conductivity ◽  
Surface Morphology ◽  
Polymer Electrolyte ◽  
Solid Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Lithium Ion ◽  
Solid Polymer ◽  
Ac Impedance Spectroscopy ◽  
Electrolyte Membrane ◽  
Battery Application

Solid polymer electrolyte with PVdF polymer and LiBOB salt has been prepared with doctor blade method. To improve the membrane ionic conductivity, TiO2 has been added. Surface morphology analysis was performed using SEM and EDX spectroscopy. Conductivity behaviour was studied with AC impedance spectroscopy (EIS). SEM and EDX analysis results have shown that TiO2 addition played a role in pore formation on solid polymer electrolyte membrane. The highest value of ionic conductivity in PVdF-LiBOB solid polymer electrolyte system in this research was found to be 5.79% x 10-6 Scm-1 in room temperature, i.e sample with 30% TiO2 addition. It was also studied that agglomeration of TiO2 particle occurred on the surface of the membrane resulted in decreasing of ionic conductivity.

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