Effect of Chemical Structure and Salt Concentration on the Crystallization and Ionic Conductivity of Aliphatic Polyethers

Poly(ethylene oxide) (PEO) is the most widely used polymer in the field of solid polymer electrolytes for batteries. It is well known that the crystallinity of polymer electrolytes strongly affects the ionic conductivity and its electrochemical performance. Nowadays, alternatives to PEO are actively researched in the battery community, showing higher ionic conductivity, electrochemical window, or working temperature range. In this work, we investigated polymer electrolytes based on aliphatic polyethers with a number of methylene units ranging from 2 to 12. Thus, the effect of the lithium bis(trifluoromethanesulfone) imide (LiTFSI) concentration on the crystallization behavior of the new aliphatic polyethers and their ionic conductivity was investigated. In all the cases, the degree of crystallinity and the overall crystallization rate of the polymers decreased drastically with 30 wt % LiTFSI addition. The salt acted as a low molecular diluent to the polyethers according to the expectation of the Flory–Huggins theory for polymer–diluent mixtures. By fitting our results to this theory, the value of the interaction energy density (B) between the polyether and the LiTFSI was calculated, and we show that the value of B must be small to obtain high ionic conductivity electrolytes.

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Holey graphene oxide as filler to improve electrochemical performance of solid polymer electrolytes

Materials Express ◽

10.1166/mex.2019.1588 ◽

2019 ◽

Vol 9 (9) ◽

pp. 1055-1061

Author(s):

Qi Wang ◽

Zhoujie Zhang ◽

Fei Shen ◽

Bin Zhao ◽

Xiaogang Han

Keyword(s):

Graphene Oxide ◽

Ionic Conductivity ◽

Polymer Electrolytes ◽

Lithium Ion ◽

Solid Polymer Electrolytes ◽

Cycle Performance ◽

Solid Polymer ◽

Electrochemical Window ◽

Poly Ethylene Oxide ◽

Poly Ethylene

Solid polymer electrolytes (SPE) have attracted wide attention of researchers because of their high safety performance and high mechanical strength. In this paper, holey graphene oxide (HGO) was added to poly(ethylene oxide) (PEO) solid polymer electrolytes with lithium bis(trifluoromethane sulfonimide) (LiTFSI) as salt to improve the ionic conductivity of solid polymer electrolytes. It was shown that the addition of holey graphene oxide improved the electrochemical window and ionic conductivity. When the amount of holey graphene oxide was 0 wt%, the ionic conductivity was 2.06 × 10–4 S/cm at 60 °C. In comparison, when the amount of holey graphene oxide was 0.2 wt%, the ionic conductivity was greatly increased to 6.05 × 10–4 S/cm. This was mainly due to the fact that addition of holey graphene oxide reduced the crystallization of polymer and promoted the migration of lithium ion. Meanwhile, the electrochemical window was expanded to 5.2 V and the cycle performance for the batteries was also improved.

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Electrospun poly(ethylene oxide) nanofibrous composites with enhanced ionic conductivity as flexible solid polymer electrolytes

High Voltage ◽

10.1049/hve.2016.0069 ◽

2017 ◽

Vol 2 (1) ◽

pp. 25-31 ◽

Cited By ~ 6

Author(s):

Jun‐Wei Zha ◽

Na Huang ◽

Kang‐Qiang He ◽

Zhi‐Min Dang ◽

Chang‐Yong Shi ◽

...

Keyword(s):

Ionic Conductivity ◽

Ethylene Oxide ◽

Polymer Electrolytes ◽

Solid Polymer Electrolytes ◽

Solid Polymer ◽

Poly Ethylene Oxide ◽

Poly Ethylene

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Ionic conductivity in polyethylene-b-poly(ethylene oxide)/lithium perchlorate solid polymer electrolytes

Electrochimica Acta ◽

10.1016/j.electacta.2007.04.016 ◽

2007 ◽

Vol 53 (4) ◽

pp. 1503-1511 ◽

Cited By ~ 33

Author(s):

L.A. Guilherme ◽

R.S. Borges ◽

E. Mara S. Moraes ◽

G. Goulart Silva ◽

M.A. Pimenta ◽

...

Keyword(s):

Ionic Conductivity ◽

Ethylene Oxide ◽

Polymer Electrolytes ◽

Lithium Perchlorate ◽

Solid Polymer Electrolytes ◽

Solid Polymer ◽

Poly Ethylene Oxide ◽

Poly Ethylene

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Role of Free Volumes and Segmental Dynamics on Ion Conductivity of PEO/LiTFSI Solid Polymer Electrolytes Filled with SiO2 Nanoparticles: A Positron Annihilation and Broadband Dielectric Spectroscopy Study

Physical Chemistry Chemical Physics ◽

10.1039/d1cp00194a ◽

2021 ◽

Author(s):

Pranav Utpalla ◽

Sandeep Kumar Sharma ◽

S. K. Deshpande ◽

Jitendra Bahadur ◽

Debasis Sen ◽

...

Keyword(s):

Ionic Conductivity ◽

Polymer Electrolytes ◽

Sio2 Nanoparticles ◽

Solid Polymer Electrolytes ◽

Solid Polymer ◽

Segmental Dynamics ◽

Broadband Dielectric Spectroscopy ◽

Poly Ethylene Oxide ◽

Poly Ethylene

Limited ionic conductivity of polymer electrolytes is a major issue in their industrial application. Enhancement in ionic conductivity in Poly (ethylene oxide), PEO, based electrolyte have been achieved by loading...

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Effects of LiClO4 on the Characteristics and Ionic Conductivity of the Solid Polymer Electrolytes Composed of PEO, LiClO4 and PLiAA

Materials Science Forum ◽

10.4028/www.scientific.net/msf.743-744.53 ◽

2013 ◽

Vol 743-744 ◽

pp. 53-58 ◽

Cited By ~ 3

Author(s):

Rui Yang ◽

Shi Chao Zhang ◽

Lan Zhang ◽

Xiao Fang Bi

Keyword(s):

Ionic Conductivity ◽

Ethylene Oxide ◽

Polymer Electrolytes ◽

Electrochemical Stability ◽

Solid Polymer Electrolytes ◽

Solid Polymer ◽

Poly Ethylene Oxide ◽

Electrochemical Stability Window ◽

Poly Ethylene

Solid polymer electrolytes (SPEs) which were composed of poly (ethylene oxide) (PEO), poly (lithium acrylate) (PLiAA), and LiClO4were prepared in order to investigate the influence of LiClO4content on the ionic conductivity of the electrolyte. All of the membranes were investigated by XRD, DSC, and EIS, et.al. The dependence of SPEs conductivity on temperature was measured, and the maximum ionic conductivity is 5.88×10-6S/cm at 293 K for membrane which is composed of PEO+PLiAA+15wt% LiClO4. The electrochemical stability window of the PEO+PLiAA+15wt% LiClO4is 4.75 V verse Li.

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Morphological, infrared, and ionic conductivity studies of poly(ethylene oxide)-49% poly(methyl methacrylate) grafted natural rubber-lithium perchlorate salt based solid polymer electrolytes

Journal of Applied Polymer Science ◽

10.1002/app.35403 ◽

2011 ◽

Vol 124 (5) ◽

pp. 4222-4229 ◽

Cited By ~ 9

Author(s):

A. Ahmad ◽

M. Y. A. Rahman ◽

M. S. Su′ait

Keyword(s):

Ionic Conductivity ◽

Ethylene Oxide ◽

Natural Rubber ◽

Polymer Electrolytes ◽

Lithium Perchlorate ◽

Solid Polymer Electrolytes ◽

Solid Polymer ◽

Poly Ethylene Oxide ◽

Poly Ethylene ◽

Perchlorate Salt

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Effect of nanostructured Al2O3 on poly(ethylene oxide)-based solid polymer electrolytes

Zeitschrift für Naturforschung B ◽

10.1515/znb-2021-0091 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Patrick Walke ◽

Anna Kirchberger ◽

Felix Reiter ◽

Daniel Esken ◽

Tom Nilges

Keyword(s):

Ionic Conductivity ◽

Ethylene Oxide ◽

Polymer Electrolytes ◽

Solid Polymer Electrolytes ◽

Solid Polymer ◽

Standard Material ◽

Poly Ethylene Oxide ◽

Standard Composition ◽

Ion Conducting ◽

Poly Ethylene

Abstract In this study, we investigated the effect of nanostructured Al2O3 particles on Li ion conducting, poly(ethylene oxide) (PEO)-based membranes prepared by electrospinning, solution casting and hot pressing. Pure PEO:LiBF4 solid polymer electrolytes (SPEs) and also plasticizer containing membranes were investigated with various amounts of Al2O3. In a first step, the best-performing composition of pure PEO:LiBF4 concerning the resulting ionic conductivity was identified and used as a standard for further experiments. In the following, the influence of the preparation method, the nature of the Al2O3, and the type of the plasticizer additives on the thermal and electrochemical properties for this standard composition were investigated. The Al2O3 composition was varied between 1 and 5 wt%. The ionic conductivity of bare electrospun PEO:LiBF4 SPE standard material has been improved by a factor ten to 1.9 × 10−6 S cm−1 at T = 293 K when 5 wt% of Al2O3 is added. For solution-casted PEO:LiBF4 standard compositions 18:1 with an initial ionic conductivity of 6.7 × 10−8 S cm−1, the addition of 2 wt% Al2O3 increased the performance to 1.4 × 10−7 S cm−1, both at T = 293 K. If succinonitrile and Al2O3 was admixed to the solution casted standard material, the ionic conductivity was further increased to reach 5.5 × 10−5 S cm−1 at T = 293 K. This material with a composition of 18:3:1 + 2 wt% Al2O3, outperforms the standard material by three orders of magnitude.

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Poly(ethylene oxide)-lithium difluoro(oxalato)borate new solid polymer electrolytes: ion–polymer interaction, structural, thermal, and ionic conductivity studies

Ionics ◽

10.1007/s11581-015-1474-3 ◽

2015 ◽

Vol 21 (10) ◽

pp. 2771-2780 ◽

Cited By ~ 28

Author(s):

Anji Reddy Polu ◽

Dong Kyu Kim ◽

Hee-Woo Rhee

Keyword(s):

Ionic Conductivity ◽

Ethylene Oxide ◽

Polymer Electrolytes ◽

Solid Polymer Electrolytes ◽

Solid Polymer ◽

Poly Ethylene Oxide ◽

Poly Ethylene ◽

Polymer Interaction

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Solid Polymer Electrolytes from Crosslinked PEG and Dilithium N,N'-Bis(trifluoromethanesulfonyl)perfluoroalkane-1,ω-disulfonamide and Lithium Bis(trifluoromethanesulfonyl)imide Salts

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc20081777 ◽

2008 ◽

Vol 73 (12) ◽

pp. 1777-1798 ◽

Cited By ~ 1

Author(s):

Olt E. Geiculescu ◽

Rama V. Rajagopal ◽

Emilia C. Mladin ◽

Stephen E. Creager ◽

Darryl D. Desmarteau

Keyword(s):

Ionic Conductivity ◽

Polymer Electrolytes ◽

Minimum Energy ◽

Ionic Conductivities ◽

Solid Polymer Electrolytes ◽

Solid Polymer ◽

Segmental Motion ◽

Concentrated Electrolytes ◽

Two Factors ◽

Poly Ethylene

The present work consists of a series of studies with regard to the structure and charge transport in solid polymer electrolytes (SPE) prepared using various new bis(trifluoromethanesulfonyl)imide (TFSI)-based dianionic dilithium salts in crosslinked low-molecular-weight poly(ethylene glycol). Some of the thermal properties (glass transition temperature, differential molar heat capacity) and ionic conductivities were determined for both diluted (EO/Li = 30:1) and concentrated (EO/Li = 10:1) SPEs. Trends in ionic conductivity of the new SPEs with respect to anion structure revealed that while for the dilute electrolytes ionic conductivity is generally rising with increased length of the perfluoroalkylene linking group in the dianions, for the concentrated electrolytes the trend is reversed with respect to dianion length. This behavior could be the result of a combination of two factors: on one hand a decrease in dianion basicity that results in diminished ion pairing and an enhancement in the number of charge carriers with increasing fluorine anion content, thereby increasing ionic conductivity while on the other hand the increasing anion size and concentration produce an increase in the friction/entanglements of the polymeric segments which lowers even more the reduced segmental motion of the crosslinked polymer and decrease the dianion contribution to the overall ionic conductivity. DFT modeling of the same TFSI-based dianionic dilithium salts reveals that the reason for the trend observed is due to the variation in ion dissociation enthalpy, derived from minimum-energy structures, with respect to perfluoroalkylene chain length.

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