High-voltage and intrinsically safe supercapacitors based on a trimethyl phosphate electrolyte

2021 ◽  
Vol 9 (36) ◽  
pp. 20725-20736
Author(s):  
Hoai Van T. Nguyen ◽  
Junam Kim ◽  
Kyung-Koo Lee
Keyword(s):  
High Voltage ◽  
Trimethyl Phosphate ◽  
Electrolyte System ◽  
Promising Candidate ◽  
Phosphate Electrolyte

The trimethyl phosphate-based electrolyte system can be considered as a promising candidate for high-voltage and intrinsically safe supercapacitors.

Dissociative ionization dynamics of dielectric gas C3F7CN

2019 ◽  
Vol 21 (30) ◽  
pp. 16451-16458 ◽  
Author(s):  
M. Ranković ◽  
J. Chalabala ◽  
M. Zawadzki ◽  
J. Kočišek ◽  
P. Slavíček ◽  
...  
Keyword(s):  
High Voltage ◽  
Dissociative Ionization ◽  
Promising Candidate ◽  
High Voltage Insulation

Fluoronitrile C3F7CN is a promising candidate for the replacement of SF6 dielectric gas in high-voltage insulation.

Identification of electrochemical reaction products in lithium–oxygen cells with 7Li nutation spectroscopy

2015 ◽  
Vol 93 (9) ◽  
pp. 976-982 ◽  
Author(s):  
Zoë E.M. Reeve ◽  
Gillian R. Goward ◽  
Alex D. Bain
Keyword(s):  
Dimethyl Carbonate ◽  
Tetraethylene Glycol ◽  
The Novel ◽  
Trimethyl Phosphate ◽  
Reaction Products ◽  
Battery System ◽  
Nutation Frequency ◽  
Main Discharge ◽  
Discharge Product ◽  
Phosphate Electrolyte

In the Li–O2 battery system, it is has been shown to be challenging to differentiate the discharge products or determine the electrolyte stability with direct 7Li NMR. Defined 7Li quadrupole lineshapes are not observed for cycled cathodes. Here, 7Li nutation NMR is demonstrated to be an effective method for the identification of Li2O2 in cycled cathodes. The 7Li quadrupole interaction of Li2O2 (35 kHz) and Li2CO3 (120 kHz) are of similar magnitude to typically radiofrequency fields (ranging from 40 to 60 kHz). The 7Li nutation frequency will therefore be influenced by both interactions. The discharge products of the cycled cathodes were determined by comparing the 7Li nutation frequencies of the cycled cathodes to the 7Li nutation frequency of the pristine materials when the applied radiofrequency field was 30 kHz. Li2CO3 was determined to be the main discharge product in the propylene carbonate/dimethyl carbonate and trimethyl phosphate electrolyte systems, since the 7Li nutation frequencies of the cathodes corresponded to the 7Li nutation frequency of pristine Li2CO3. The 7Li nutation frequency of the tetraethylene glycol dimethyl ether cathode was between the 7Li nutation frequencies of both pristine Li2O2 and pristine Li2CO3, indicating that both Li2O2 and Li2CO3 were discharge products influencing the observed nutation frequency. From 7Li nutation NMR the novel trimethyl phosphate electrolyte was determined to be an unsuitable Li–O2 electrolyte, as the fast 7Li nutation frequency indicated that Li2O2 was not a primary discharge species. With 17O NMR, Li2CO3 was confirmed to be a main discharge product formed with the trimethyl phosphate electrolyte.

Developing high voltage Zn(TFSI)2 / Pyr14TFSI / AN hybrid electrolyte for carbon-based Zn ion hybrid capacitor

Nanoscale ◽  
2021 ◽  
Author(s):  
Li Zhang ◽  
ziqiang liu ◽  
gaowei wang ◽  
Jianze Feng ◽  
quanhu ma
Keyword(s):  
Energy Storage ◽  
High Voltage ◽  
Lithium Ion ◽  
Zinc Ion ◽  
Promising Candidate ◽  
Ion Energy ◽  
Storage Technology ◽  
Energy Storage Technology ◽  
Hybrid Capacitors ◽  
Carbon Based

Aqueous Zn-ion hybrid capacitors (ZIHCs), integrating the typical characteristics of Zinc ion batteries and supercapacitors, have become a promising candidate to replace or supplement lithium-ion energy storage technology. However, the...

High Voltage Li-Ion Capacitors in a Fluoro-Ether Based Electrolyte System

2018 ◽  
Vol 47 (9) ◽  
pp. 5118-5121 ◽  
Author(s):  
Bin Liu ◽  
Lingzhi Zhu ◽  
Enshan Han ◽  
Han Xu
Keyword(s):  
High Voltage ◽  
Electrolyte System ◽  
Li Ion

A low-cost “water-in-salt” electrolyte for a 2.3 V high-rate carbon-based supercapacitor

2019 ◽  
Vol 7 (13) ◽  
pp. 7541-7547 ◽  
Author(s):  
Xudong Bu ◽  
Lijun Su ◽  
Qingyun Dou ◽  
Shulai Lei ◽  
Xingbin Yan
Keyword(s):  
High Voltage ◽  
Low Cost ◽  
High Rate ◽  
Promising Candidate ◽  
Low Viscosity ◽  
Carbon Based

With the advantages including wide ESW, superior conductivity, low viscosity and low cost, NaClO4-based WIS electrolyte can be considered as a promising candidate for high-voltage and high-rate aqueous carbon based SCs with good safety.

scholarly journals Investigating on physical and electrochemical properties of high concentrated electrolytes based on LiBF4 salt for 5 V Li-ion rechargeable batteries

2021 ◽  
Vol 63 (11) ◽  
pp. 12-16
Author(s):  
Kim Ngan Pham ◽  
◽  
Minh Kha Le ◽  
Thi Thanh Tuyen Truong ◽  
Thi Kim Tuyen Huynh ◽  
...  
Keyword(s):  
High Voltage ◽  
Coulombic Efficiency ◽  
Oxidation Stability ◽  
Rechargeable Batteries ◽  
Li Ion Batteries ◽  
Trimethyl Phosphate ◽  
Voltage Range ◽  
Concentrated Electrolytes ◽  
Li Ion ◽  
Initial Coulombic Efficiency

In this work, highly concentrated electrolytes were prepared by dissolving tetrafluoroborate (LiBF4) salt in the two solvents including tetramethylene sulfone (TMS) and trimethyl phosphate (TMP) with different mole ratios. The results indicated that the electrolyte LiBF4/TMS (1:3) (~3.4 M) possessed the highest oxidation stability of 6.2 V (vs. Li+/Li) and high ionic conductivity of 1.0 mS/cm that could be promising for high voltage Li-ion batteries operated in the voltage range of 3.5-4.9 V. The electrolyte compatibility with high voltage cathode Li || LiNi0.5Mn1.5O4 (LNMO) was evaluated in coin-cell configuration, which displayed high reversible discharge capacity of 113 mAh/g in the first cycle and high initial Coulombic efficiency >91% and remained >80% of the initial capacity at the 100th cycle. By using the cyclic voltammetry (CV) method, the diffusion coefficient was also calculated as about 4.51×10-11 cm2/s.

scholarly journals Investigation of Ni doped LiMn2O4 used as cathode materials for high voltage Lithium batteries

2013 ◽  
Vol 16 (3) ◽  
pp. 48-59
Author(s):  
Giang Van Tran ◽  
Dung Thi Thuy Tran ◽  
Man Van Tran ◽  
Phung My Loan Le
Keyword(s):  
High Voltage ◽  
Lithium Batteries ◽  
Hybrid Electric Vehicles ◽  
High Energy ◽  
High Energy Density ◽  
Li Ion Batteries ◽  
Promising Candidate ◽  
Active Electrode ◽  
Xrd Diffraction ◽  
Li Ion

Li-ion batteries are already used in many nomad applications, but improvement of this technology is still necessary to be durably introduced on new markets such as electric vehicle (EVs), hybrid electric vehicles (HEVs). Modification of the nature of the active electrode material is the most challenging and innovative aspect. Among high voltage spinel-oxides with general composition LiMxMn2-xO4 (M transition metals), Ni doped LiMn2O4, LiNixMn2-xO4 (0 < x < 0.7) possessing a potential voltage of ca. 4.7 V versus Li+/Li, is promising candidate for high power and high voltage lithium batteries. The materials were synthesized by solid state reaction of two annealing steps at 600°C and 900°C. The structure and electrochemical properties of these materials were characterized by XRD diffraction (XRD), Raman spectroscopy, Scanning electron microscopy (SEM), Cyclic Voltammetry (CV) and charge – discharge cycling test using Swagelok cell. It is demonstrated that LiNi0.5Mn1.5O4 and LiNi0.4Mn1.6O4 have remarkable properties such as high potential, high energy density, and good cycle life.

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