Effects of Organic Additives on Lithium Insertion/extraction for Graphite Electrode in Ionic Liquid Electrolytes Based on Bis(fluorosulfonyl)imide

Sugimoto, Toshinori; Atsumi, Yosuke; Handa, Naoyuki; Yamagata, Masaki; Kono, Mitsuhiko; Kikuta, Manabu; Ishiko, Eriko; Ishikawa, Masashi

doi:10.5796/electrochemistry.77.696

Cited by 8 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10 However, the use of electrolyte additives leads to an increase in graphite electrode/electrolyte interfacial resistance. 11 Therefore, we should consider a new method to form good SEI without any electrolyte additives.…”

Section: Introductionmentioning

confidence: 99%

A New Prospect for Stabilization of Graphite Electrode/Electrolyte Interface in Bis(fluorosulfonyl)imide Anion-based Ionic Liquid Electrolyte

2018

Self Cite

View full text Add to dashboard Cite

We investigated effects of high lithium bis(fluorosulfonyl)imide (LiFSI) salt concentration or heat treatment before initial charge on charge-discharge performance of a graphite electrode in a 1-ethyl-3-methylimidazolium (EMImFSI)-based ionic liquid (IL) electrolyte. LiF was observed at the surface of graphite electrodes taken out from 2.00 mol kg −1 LiFSI/EMImFSI system and from 0.32 mol kg −1 LiFSI/EMImFSI system with pre-heat treatment before the initial charge. The surface LiF effectively suppresses the reductive decomposition of EMIm + . As a result, the irreversible capacity of initial cycle was significantly suppressed and the coulombic efficiency of subsequent cycles was greatly improved.

show abstract

Section: Introductionmentioning

confidence: 99%

A New Prospect for Stabilization of Graphite Electrode/Electrolyte Interface in Bis(fluorosulfonyl)imide Anion-based Ionic Liquid Electrolyte

2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…This is supported by the CVs of the electrolytes based on PC and bis(uorosulfonyl)imide (FSI) based ionic liquids, which have been actively studied and shown to be compatible with graphite electrodes. [30][31][32][33] No lithium intercalation was observed in 0.8 M LiTFSI/EMIM$TFSI electrolyte but indeed in 0.8 M LiTFSI/EMIm$FSI electrolyte. 30 However, with addition of 10 wt% PC to 0.8 M LiTFSI/EMIm$FSI electrolyte, one big characteristic peak due to PC co-intercalation and decomposition was observed.…”

Section: The Role Of Bfmb Anion In Sei Formationmentioning

confidence: 91%

Bis(fluoromalonato)borate (BFMB) anion based ionic liquid as an additive for lithium-ion battery electrolytes

et al. 2014

View full text Add to dashboard Cite

show abstract

“…We successfully applied bis(fluorosulfonyl)imide anion (FSI)-based ionic liquids to electrolytes for Li-ion secondary batteries, which provide reversible Li-ion insertion/extraction and high charge-discharge efficiency for a graphitized negative electrode without any additives (1)(2)(3)(4)(5). We have also investigated electrochemical behavior of various electrodes in these ionic liquids, e.g., Ni-Si-C composite or La-Ni-Sn alloy (6).…”

Section: Introductionmentioning

confidence: 99%

Li-Ion Battery Performance with FSI-Based Ionic Liquid Electrolyte and Fluorinated Solvent-Based Electrolyte

et al. 2011

Self Cite

View full text Add to dashboard Cite

We evaluated the electrochemical behavior of a LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC) electrode in a neat ionic liquid, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMImFSI), electrolyte. According to charge/discharge measurements, the discharge capacity of the NMC cathode in EMImFSI at 1 C in a voltage range of 3.0-4.5 (vs. Li/Li + ) shows 165 mAh g -1 , which is higher than that in a conventional electrolyte, EC+DMC. The rate capability of a cell with EMImFSI exceeds that with EC+DMC, especially at high rates, probably due to a low resistance at the electrode/electrolyte interface. These results suggest that EMImFSI is a suitable electrolyte for Li-ion batteries utilizing a NMC cathode. Also, we applied fluorine-containing solvents (FCSs) to an electrolyte for Li-ion batteries with a cobalt oxide (LiCoO 2 ) cathode to enhance the upper voltage limit and investigated its electrochemical properties in a proposed FCS-based electrolyte. A test cell containing a FCS-based electrolyte exhibits high and stable discharge capacity for 30 cycles even with a high upper cutoff voltage of 4.5 V when compared with a cell containing a conventional electrolyte. IntroductionAmbient temperature ionic liquids have attracted increasing attention in batteries because of their wide potential window, acceptable conductivity, high thermal stability and negligible vapor pressure. However, Li-ion batteries with ionic liquid electrolytes have some difficulties in their charge-discharge performance. Decomposition of ionic liquids on a negative electrode and intercalation of an organic cation, which lead to irreversible Li + insertion/extraction, are serious problems of losing their charge-discharge capacity.We successfully applied bis(fluorosulfonyl)imide anion (FSI)-based ionic liquids to electrolytes for Li-ion secondary batteries, which provide reversible Li-ion insertion/extraction and high charge-discharge efficiency for a graphitized negative electrode without any additives (1-5). We have also investigated electrochemical behavior of various electrodes in these ionic liquids, e.g., Ni-Si-C composite or La-Ni-Sn alloy (6). We found these electrodes exhibit reversibility in our various ionic liquid electrolytes. Furthermore, a LiNi 1/3 Mn 1/3 Co 1/3 O 2 positive electrode showed excellent reversibility even at 4.5V in an EMIFSI-based electrolyte with an initial capacity of 171 ECS Transactions, 33 (28) 29-36 (2011) 10.1149/1.3563087 © The Electrochemical Society 29 ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 141.211.4.224 Downloaded on 2015-07-12 to IPmAh g -1 and 98% of this capacity at the 50th cycle. Elexcel Co. tested Li-ion batteries containing FSI ionic liquids. A Li-ion battery with LiMn 1/3 Ni 1/3 Co 1/3 O 2 as cathode material maintained over 80% of its initial capacity in 2000 cycles at 100% DOD. The power density of the cell reached to 2050W kg -1 at 50% SOC.On the other hand, recently, a nonflammable fluorine-containing solvent (FCS) has ...

show abstract

Effects of Organic Additives on Lithium Insertion/extraction for Graphite Electrode in Ionic Liquid Electrolytes Based on Bis(fluorosulfonyl)imide

Cited by 8 publications

References 21 publications

A New Prospect for Stabilization of Graphite Electrode/Electrolyte Interface in Bis(fluorosulfonyl)imide Anion-based Ionic Liquid Electrolyte

A New Prospect for Stabilization of Graphite Electrode/Electrolyte Interface in Bis(fluorosulfonyl)imide Anion-based Ionic Liquid Electrolyte

Bis(fluoromalonato)borate (BFMB) anion based ionic liquid as an additive for lithium-ion battery electrolytes

Li-Ion Battery Performance with FSI-Based Ionic Liquid Electrolyte and Fluorinated Solvent-Based Electrolyte

Contact Info

Product

Resources

About