New deep eutectic solvents based on ethylene glycol - LiTFSI and their application as an electrolyte in electrochemical double layer capacitor (EDLC)

Tran, Kieu Thuy Thi; Le, Linh; Phan, An Le Bao; Tran, Phuong Hoang; Võ, Dũng Trung; Truong, Tuyen T. T.; Nguyen, Ngoc Thanh; Garg, Akhil; Le, Phuong; Trần, Mẫn Văn

doi:10.1016/j.molliq.2020.114495

Cited by 53 publications

(28 citation statements)

References 17 publications

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“…Among the synthesized DESs, LiTFSI:EG 1:4 exhibited the highest ionic conductivity value (3.05 mS cm −1 at 30 °C). 146 With the increase in the EG amount up to 80wt%, the ionic conductivity of the corresponding DES increased since EG promotes the hydrogen interaction between Li + and the oxygen of EG or the -SO2 group of TFSI − and the hydrogen of EG. When EG concentration exceeded 80wt%, the conductivity started to decrease, likely due to the significant decrease in charge carrier concentration.…”

Section: Lithium Salts and Alcoholsmentioning

confidence: 99%

“…A wide array of alcohols have been used so far as HBDs for DESs, 5 but to the best of our knowledge their mixtures with lithium salts have not been applied as electrolytes for batteries yet. A few reports investigate their application for electrochemical double layer capacitors, 146 or electrochromic devices, 7,152,153 giving some insights into their characterization for electrochemical applications. Cruz et al showed for instance that for the same lithium salt (LiCl or lithium iodide LiI) DESs containing G showed lower conductivity values than the EG analogues.…”

Section: Lithium Salts and Alcoholsmentioning

confidence: 99%

“…Cruz et al showed for instance that for the same lithium salt (LiCl or lithium iodide LiI) DESs containing G showed lower conductivity values than the EG analogues. 7,153 The same HBD EG was used by Tran et al to prepare mixtures with LiTFSI, 146 as alternative electrolytes to LiTFSI:amide systems, which are characterized by high viscosity at ambient temperature. The viscosity values of mixtures with mole ratio between 1:1 and 1:5 range from ca.…”

Section: Lithium Salts and Alcoholsmentioning

confidence: 99%

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Deep eutectics and analogues as electrolytes in batteries

Pietro

Mele

2021

Journal of Molecular Liquids

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Deep eutectic Solvents (DESs) are an emerging class of materials showing a marked depression in melting points compared to those of the neat constituents and characterized by a number of beneficial properties. DES research currently prospers and out of the multiple current applications, the electrochemistry field is likely the most flourishing. This detailed review emphasizes recent research efforts in order to apply type III and type IV DESs and their analogues as electrolytes for rechargeable cationic batteries. The recent developments in the last decade are outlined, framing outstanding achievements and open questions, and identifying future optimisation directions to overcome the existing challenges.

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Section: Lithium Salts and Alcoholsmentioning

confidence: 99%

Section: Lithium Salts and Alcoholsmentioning

confidence: 99%

Section: Lithium Salts and Alcoholsmentioning

confidence: 99%

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Deep eutectics and analogues as electrolytes in batteries

Pietro

Mele

2021

Journal of Molecular Liquids

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“…EG was stirred at 80 o C for at least 8 hours to give a homogeneous DES (DES 1 : 4). DES 1 : 4 has been proved as the potential DES compromising the ionic conductivity [23,24]. Indeed, the low amount of LiTFSI induces a better dissociation of ions and low viscosity of DES fluid.…”

Section: Dess and Des-based Electrolytes Preparationmentioning

confidence: 99%

“…solvent (ethylene carbonate or acetonitrile) were investigated. e pure DES at a molar ratio of 1 : 4 between lithium bis((trifluoromethyl)sulfonyl) imide (LiTFSI) and ethylene glycol (EG) was selected to combine with the solvent owing to its lowest viscosity and highest ionic conductivity, as previously reported in our study [23].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Deep Eutectic Solvent of LiTFSI-Ethylene Glycol Organic Electrolyte for Activated Carbon-Based Supercapacitors

Tran

Truong

Nguyen

et al. 2021

Journal of Chemistry

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This research work demonstrates a novel hybrid electrolyte based on a deep eutectic solvent (DES) combined with organic solvents for high-performance supercapacitors. DES was formed between ethylene glycol (EG) and lithium bis((trifluoromethyl)sulfonyl) imide (LiTFSI) and diluted by ethylene carbonate (EC) or acetonitrile (AN) with different amounts (10–50% wt.). Such a combination gives superior properties for hybrid electrolytes compared to pure DESs and reduces the volatility of mixed organic solvents. Regarding the electrochemical properties, DES-AN mixtures exhibited a better performance under high applied voltage and more reversible behavior than DES-EC ones, which suffered from the increasing distance in the electrical double layer. DES 1 : 4 + 20% wt. AN exhibited favorable electrolyte properties such as high ionic conductivity (3.1 mS·cm−1 at 30oC), relatively lower viscosity (14.28 mPa s at 30oC, approximately 2 times lower thanDES pure), and quite large electrochemical stability window up to 3.4 V (at 20–30% wt. AN) compared to the baseline electrolyte (LiTFSI/TBABF4 in AN). With these interesting properties, selected hybrid electrolyte (DES 1 : 4 + 20% wt. AN) tested in the symmetric capacitor using the activated carbon offered decent capacitance (15 F·g−1 at 3.4 V with a scanning rate of 1 A·g−1 and remains around 95% after 100 cycles) and good charge-discharge durability (>80% retention after 2000 cycles), especially the EDLC with DES 1 : 4 + 20% wt. AN shows good rate capacity (13.2 F·g−1 at 2 A·g−1, remaining 6 F·g−1 at 10 A·g−1).

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Deep Eutectic Solvents for Boosting Electrochemical Energy Storage and Conversion: A Review and Perspective

Liang

et al. 2021

Adv Funct Materials

210

163

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The pursuit of sustainable energy utilization arouses increasing interest in efficiently producing durable battery materials and catalysts with minimum environmental impact. As green, safe, and cheap eutectic mixtures, deep eutectic solvents (DESs) provide tremendous opportunities and open up attractive perspectives as charge transfer and reaction media for electrochemical energy storage and conversion (EESC). In this review, the fundamental properties of DESs are first summarized. Then, the important roles that DESs play in various EESC technologies including advanced electrolytes for batteries/supercapacitors, media for the preparation of electrode materials and catalysts, and extracting agents for battery recycling are systematically reviewed. A particular focus is placed on the fundamental understanding of structure-composition-property-performance relationships. Finally, the challenges for the controllable design of DESs for EESC applications and future developments are presented. This review is expected to shed light on developing advanced DESs for next-generation EESC systems.

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New deep eutectic solvents based on ethylene glycol - LiTFSI and their application as an electrolyte in electrochemical double layer capacitor (EDLC)

Cited by 53 publications

References 17 publications

Deep eutectics and analogues as electrolytes in batteries

Deep eutectics and analogues as electrolytes in batteries

Hybrid Deep Eutectic Solvent of LiTFSI-Ethylene Glycol Organic Electrolyte for Activated Carbon-Based Supercapacitors

Deep Eutectic Solvents for Boosting Electrochemical Energy Storage and Conversion: A Review and Perspective

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