scholarly journals Ion Transport Mechanism in Flexible PMMAIL/LiTf Films

2019 ◽  
Vol 7 (4.14) ◽  
pp. 515
Author(s):  
Nabilah Akemal Muhd Zailani ◽  
Famiza Abdul Latif ◽  
Ab Malik Marwan Ali ◽  
Mohd A Azri Ab Rani ◽  
Muhd Zu Azhan Yahya
Keyword(s):  
Hydrogen Bonding ◽  
Ionic Conductivity ◽  
Ion Transport ◽  
Transport Mechanism ◽  
Mechanical Stability ◽  
Pmma Film ◽  
Energy Storage Devices ◽  
Lithium Triflate ◽  
Free Standing ◽  
Storage Devices

Acrylates such as poly (methyl methacrylate) (PMMA) has been widely studied as polymer electrolyte film due to its good mechanical stability towards lithium electrode.  However, commercial PMMAs even at high molecular weight are not able to produce flexible films due to their polar nature that prone to form interchain crosslinking via hydrogen bonding. Therefore, the formation of hydrogen bonding was hindered by incarcerating ionic liquid (IL) of 1-methyl-3-pentamethyldisiloxymethylimidazolium bis(trifluoromethylsulfonyl)imide, [(SiOSi)C1C1im] [NTf2] during free radical polymerization of MMA. Interestingly, the synthesized PMMA containing IL (PMMAIL) produced flexible and free standing films with ionic conductivity of ~10-7 S cm-1. Though the ionic conductivity obtained is comparable with other doped PMMA film electrolytes that had been studied, it is still considered as low for application in energy storage devices. As an alternative, in this study, lithium triflate (LiTf) salt was added into the PMMAIL system and the highest ionic conductivity obtained was 2.65 ×10-4 S cm-1 with addition of 30 wt.% LiTf at ambient temperature. The temperature dependence conductivity and AC conductivity behaviour of PMMAIL/LiTf were further investigated in order to fully understand the ion transport mechanism that occurred in the system. It was found that the PMMAIL/LiTf system fits the Arrhenius behaviour and Correlated Barrier Hopping (CBH) model.  

How Certain Are the Reported Ionic Conductivities of Thiophosphate-Based Solid Electrolytes? an Interlaboratory Study

2020 ◽  
Author(s):  
Saneyuki Ohno ◽  
Tim Bernges ◽  
Johannes Buchheim ◽  
Marc Duchardt ◽  
Anna-Katharina Hatz ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Ionic Conductivity ◽  
Relative Standard Deviation ◽  
Solid Electrolytes ◽  
Ionic Conductivities ◽  
Ionic Conductors ◽  
Energy Storage Devices ◽  
Activation Barriers ◽  
Storage Devices ◽  
Relative Standard

<p>Owing to highly conductive solid ionic conductors, all-solid-state batteries attract significant attention as promising next-generation energy storage devices. A lot of research is invested in the search and optimization of solid electrolytes with higher ionic conductivity. However, a systematic study of an <i>interlaboratory reproducibility</i> of measured ionic conductivities and activation energies is missing, making the comparison of absolute values in literature challenging. In this study, we perform an uncertainty evaluation via a Round Robin approach using different Li-argyrodites exhibiting orders of magnitude different ionic conductivities as reference materials. Identical samples are distributed to different research laboratories and the conductivities and activation barriers are measured by impedance spectroscopy. The results show large ranges of up to 4.5 mScm<sup>-1</sup> in the measured total ionic conductivity (1.3 – 5.8 mScm<sup>-1</sup> for the highest conducting sample, relative standard deviation 35 – 50% across all samples) and up to 128 meV for the activation barriers (198 – 326 meV, relative standard deviation 5 – 15%, across all samples), presenting the necessity of a more rigorous methodology including further collaborations within the community and multiplicate measurements.</p>

MXene for aqueous zinc-based energy storage devices

2021 ◽  
Author(s):  
Ye Chen ◽  
Xinyu Yin ◽  
Shuyuan Lei ◽  
Xiaojing Dai ◽  
Xilian Xu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Mechanical Stability ◽  
Low Cost ◽  
Electronic Conductivity ◽  
Zinc Ion ◽  
Research Progress ◽  
Transition Metal Carbide ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
High Electronic Conductivity

MXene, a class of 2D transition metal carbide/nitride materials, has attracted widespread attention since its first discovery in 2011. Due to its high electronic conductivity, large specific surface area, good mechanical stability, and adjustable surface functional groups, MXene-based nanomaterials have shown great potential in energy storage devices. Meanwhile, zinc-based aqueous energy storage devices became a hotspot recently in energy storage field on account of their high security and low cost. In this review, the research progress on the preparation routes, preserving method, related structure and properties of MXene is first summarized. Followed by is an introduction of the recent state-of-the-art development of MXene-based electrodes for zinc-based aqueous energy storage devices, including zinc ion batteries (ZIBs), zinc-air batteries (ZABs), and zinc-halide batteries (ZHBs). Finally, the major bottleneck and perspectives for MXene-based nanomaterials in zinc-based aqueous energy storage devices are pointed out.

A bismuth oxide nanosheet-coated electrospun carbon nanofiber film: a free-standing negative electrode for flexible asymmetric supercapacitors

2016 ◽  
Vol 4 (42) ◽  
pp. 16635-16644 ◽  
Author(s):  
Lu Li ◽  
Xitian Zhang ◽  
Zhiguo Zhang ◽  
Mingyi Zhang ◽  
Lujia Cong ◽  
...  
Keyword(s):  
Energy Storage ◽  
Bismuth Oxide ◽  
Carbon Nanofiber ◽  
Negative Electrode ◽  
Next Generation ◽  
Energy Storage Devices ◽  
Free Standing ◽  
Asymmetric Supercapacitors ◽  
Storage Devices ◽  
Nanofiber Film

The development of a negative electrode for supercapacitors is very critical for the next-generation of energy-storage devices while it remains a great challenge.

scholarly journals Cathode–Sulfide Solid Electrolyte Interfacial Instability: Challenges and Solutions

2020 ◽  
Author(s):  
Teerth Brahmbhatt ◽  
◽  
Guang Yang ◽  
Ethan Self ◽  
Jagjit Nanda ◽  
...  
Keyword(s):  
Energy Storage ◽  
Solid State ◽  
Ionic Conductivity ◽  
Energy Density ◽  
Interfacial Instability ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Solid State Batteries ◽  
All Solid State Batteries ◽  
Solid State Electrolytes

All-solid-state batteries are a candidate for next-generation energy-storage devices due to potential improvements in energy density and safety compared to current battery technologies. Due to their high ionic conductivity and potential scalability through slurry processing routes, sulfide solid-state electrolytes are promising to replace traditional liquid electrolytes and enable All-solid-state batteries, but stability of cathode-sulfide solid-state electrolytes interfaces requires further improvement. Herein we review common issues encountered at cathode-sulfide SE interfaces and strategies to alleviate these issues.

scholarly journals Polymerizable Ionic Liquids for Solid-State Polymer Electrolytes

Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 324 ◽  
Author(s):  
Robert Löwe ◽  
Thomas Hanemann ◽  
Andreas Hofmann
Keyword(s):  
Ionic Liquids ◽  
Ionic Conductivity ◽  
Polymer Electrolytes ◽  
High Yield ◽  
Dsc Analysis ◽  
Energy Storage Devices ◽  
Methyl Group ◽  
Storage Devices ◽  
Alkyl Groups ◽  
Phase Transition Temperatures

Eight new polymerizable ammonium-TFSI ionic liquids were synthesized and characterized with respect to an application in energy storage devices. The ionic liquids feature methacrylate or acrylate termination as polymerizable groups. The preparation was optimized to obtain the precursors and ionic liquids in high yield. All products were characterized by NMR and IR spectroscopy. Phase transition temperatures were obtained by DSC analysis. Density, viscosity and ionic conductivity of the ionic liquids were compared and discussed. The results reveal that the length of attached alkyl groups as well as the methyl group at the polymerizable function have significant influences on the ionic liquids physicochemical properties. Ionic conductivity values vary between 0.264 mS cm−1 for [C2NA,22]TFSI and 0.080 mS cm−1 for [C8NMA,22]TFSI at 25 °C. Viscosity values are within a range of 0.762 Pa s for [C2NA,22]TFSI and 1.522 Pa s for [C6NMA,22]TFSI at 25 °C.

scholarly journals Graphene Papers with Tailored Pore Structures Fabricated from Crumpled Graphene Spheres

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 815 ◽  
Author(s):  
Je Kang ◽  
TaeGyeong Lim ◽  
Myeong Hee Jeong ◽  
Ji Won Suk
Keyword(s):  
Electrode Materials ◽  
Electrochemical Characteristics ◽  
Energy Storage Devices ◽  
Free Standing ◽  
Storage Devices ◽  
Mechanical And Electrical Properties ◽  
Pore Structures ◽  
Standing Structure ◽  
Crumpled Graphene ◽  
Inner Pore

Graphene papers have great potential for various applications, such as electrodes in energy storage devices, protective coating, and desalination, because of their free-standing structure, flexibility, and chemical tunability. The inner structures of the graphene papers can affect their physical properties and device performance. Here, we investigated a way to fabricate graphene papers from crumpled reduced graphene oxide (rGO) spheres. We found that ultrasonication was useful for tailoring the morphology of the crumpled graphene spheres, resulting in a successful fabrication of graphene papers with tunable inner pore structures. The fabricated graphene papers showed changes in mechanical and electrical properties depending on their pore structures. In addition, the tailored pore structures had an influence on the electrochemical performance of supercapacitors with the fabricated graphene papers as electrode materials. This work demonstrates a facile method to fabricate graphene papers from crumpled rGO powders, as well as a fundamental understanding of the effect of the inner pore structures in mechanical, electrical, and electrochemical characteristics of graphene papers.

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