FTIR and Raman Study of the Li[sub x]Ti[sub y]Mn[sub 1−y]O[sub 2] (y=0, 0.11) Cathodes in Methylpropyl Pyrrolidinium Bis(fluoro-sulfonyl)imide, LiTFSI Electrolyte

Hardwick, Laurence J.; Saint, Juliette; Lucas, Ivan T.; Doeff, Marca M.; Kostecki, Robert

doi:10.1149/1.3040210

Cited by 51 publications

(33 citation statements)

References 27 publications

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“…The addition of more than 2 wt% FEC changed the nitrogen/sulfur ratio to 1:2, which is a typical ratio for this salt. 32 To further investigate the electrochemical performance and longterm cycling stability of 1 M LiTFSI in TEGDME without FEC on graphite, CCCP cycling measurements were carried out. The potential vs. time diagram of graphite electrodes using 1 M LiTFSI in TEGDME with and without FEC showed insufficient intercalation and deintercalation of lithium ions into/from the graphite electrode (Figure 5a).…”

Section: Resultsmentioning

confidence: 99%

Fluoroethylene Carbonate as Electrolyte Additive in Tetraethylene Glycol Dimethyl Ether Based Electrolytes for Application in Lithium Ion and Lithium Metal Batteries

Heine

Hilbig

et al. 2015

J. Electrochem. Soc.

225

124

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Solid electrolyte interphase (SEI) forming electrolyte additives are able to improve the performance of lithium ion and lithium metal batteries. In this work, the electrochemical performance of graphite and lithium metal, when using 1 M LiTFSI (lithium bis(trifluoro-methanesulfonyl)imide) in tetraethylene glycol dimethyl ether (TEGDME) with and without the addition of different amounts of fluoroethylene carbonate (FEC), is compared. It is shown that 1 M LiTFSI in TEGDME without additive is not able to form an effective SEI on graphite and that this electrolyte is also continuously decomposing on lithium metal. By the addition of > 2 wt% FEC, an effective SEI is formed on both, lithium metal and graphite, enabling good cycling stability. Furthermore, 1 M LiTFSI in TEGDME with FEC as additive is a suitable electrolyte for lithium iron phosphate (LFP) based lithium ion batteries.In analogy to metallic lithium and lithium-rich "lithium-alloys", lithiated (charged) graphite/carbon is thermodynamically unstable in the typically used organic solvent-based electrolytes. 1 Therefore, the carbon surfaces, which are exposed to the electrolyte, have to be kinetically protected by an solid electrolyte interphase (SEI). 2 Nevertheless, there are significant differences in the SEI formation process between metallic lithium and graphite/carbon. 3 Film formation on metallic lithium takes place right upon contact with the electrolyte. The various electrolyte components decompose spontaneously with low selectivity on the Li metal surface and parts of the decomposition products form the SEI. Due to an increase in IR drop across the SEI, with SEI growth, the reactivity of metallic lithium electrode vs. electrolyte decreases. As a consequence, the reduction of the electrolyte becomes more and more selective. The number of electrolyte components, which are still sensitive to reduction vs. the (now partially electronically "passivated") lithium electrode are limited. On the contrary, SEI formation on carbonaceous lithium storage materials takes place as a charge consuming side reaction in the first few cycles, especially during the first reduction (charge reaction). The electrolyte components, which are the least stable toward reduction, selectively react first. This makes SEI forming electrolyte additives particularly attractive for the use with carbonaceous anodes. When the electrolyte additive forms an effective SEI and is sensitive to reduction, the additive is reduced first and forms an initial SEI before reduction reactions of the other (main) electrolyte components takes place. 4 With the addition of suitable electrolyte additives, the initial SEI can be tailored and appropriate cell formation can be achieved. As a result of the different SEI formation processes, the SEI compositions on lithium metal and on carbonaceous anodes are different. 3,5 In addition to the above mentioned differences, the surface of metallic lithium is periodically renewed during cycling, causing formation of a new SEI in each following cycle (Figure 1). ...

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Section: Resultsmentioning

confidence: 99%

Fluoroethylene Carbonate as Electrolyte Additive in Tetraethylene Glycol Dimethyl Ether Based Electrolytes for Application in Lithium Ion and Lithium Metal Batteries

Heine

Hilbig

et al. 2015

J. Electrochem. Soc.

225

124

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“…38 Aer mixing PEO with LiTFSI, the peak shi of PEO at 1360 cm À1 to 1357 cm À1 , 1340 cm À1 to 1346 cm À1 and the peak shi of -SO 2 -at 1326 cm À1 in LiTFSI to 1334 cm…”

Section: 34mentioning

confidence: 96%

Biocompatible and biodegradable solid polymer electrolytes for high voltage and high temperature lithium batteries

Lin

Cheng

et al. 2017

RSC Adv.

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Solid polymer electrolytes (SPEs) have significant potential to improve the energy density of lithium batteries and exhibit good flexibility, electrochemical stability and increased safety. In this study, a biocompatible and biodegradable SPE is prepared by using the natural product, wheat flour. The SPE is found to have an ionic conductivity of 2.62 Â 10 À5 S cm À1 at 25 C with a Li + ionic transference number of 0.51.

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“…Intercalation of the IL cation into graphite was also reported to occur below 1 V vs Li/Li + , 24,25 which leads to poor cycling efficiency and also prevents the use of graphite, which is then exfoliated, with most IL-based electrolytes. 30,31 The cycling behavior of such ILs with LiFePO 4 cathodes was also studied. 8,26 Ishikawa et al 16,27,28 studied the feasibility of reversibly inserting Li + cations into graphite using LiTFSI as the lithium salt and FSI − -based ILs with either EMI + or N-methyl-N-propylpyrrolidinium ͑PY 13 + ͒ cations.…”

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confidence: 99%

Electrochemical and Physicochemical Properties of PY[sub 14]FSI-Based Electrolytes with LiFSI

Paillard

Zhou

Henderson

et al. 2009

J. Electrochem. Soc.

153

144

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We report here the characterization of Li battery electrolytes based upon the N -butyl- N -methylpyrrolidinium bis(fluorosulfonyl)imide ionic liquid (PY14FSI) with lithium bis(fluorosulfonyl)imide (LiFSI) as a support salt. These electrolytes show low viscosity relative to other pyrrolidinium-based ionic liquids (ILs) and corresponding higher conductivity at subambient temperatures. The melting point of the IL decreases with the addition of LiFSI and concentrated samples remain totally amorphous. The electrolytes exhibit decreased thermal stability and increased parasitic cathodic reactions with increasing LiFSI fraction relative to the pure IL, probably due to a higher impurity level for the commercial LiFSI. Despite this, the electrolytes have excellent lithium cycling behavior at 20°C .

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FTIR and Raman Study of the Li[sub x]Ti[sub y]Mn[sub 1−y]O[sub 2] (y=0, 0.11) Cathodes in Methylpropyl Pyrrolidinium Bis(fluoro-sulfonyl)imide, LiTFSI Electrolyte

Abstract: This work demonstrates the protective effect of partial titanium substitution in

Cited by 51 publications

References 27 publications

Fluoroethylene Carbonate as Electrolyte Additive in Tetraethylene Glycol Dimethyl Ether Based Electrolytes for Application in Lithium Ion and Lithium Metal Batteries

Fluoroethylene Carbonate as Electrolyte Additive in Tetraethylene Glycol Dimethyl Ether Based Electrolytes for Application in Lithium Ion and Lithium Metal Batteries

Biocompatible and biodegradable solid polymer electrolytes for high voltage and high temperature lithium batteries

Electrochemical and Physicochemical Properties of PY[sub 14]FSI-Based Electrolytes with LiFSI

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