Effects of cyclic carbonates as additives to γ-butyrolactone electrolytes for rechargeable lithium cells

Kinoshita, Shin-chi; Kotato, Minoru; Sakata, Yuichi; Ue, Makoto; Watanabe, Y.; Morimoto, Hideyuki; Tobishima, Shin‐ichi

doi:10.1016/j.jpowsour.2008.05.035

Cited by 69 publications

(45 citation statements)

References 7 publications

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“…Coulombic efficiency not higher than ∼97% may be ascribed to a slight reduction of electrolyte during discharge, but it remains almost constant during last 80 cycles at high current rate of 3 C. Since the system PYR 14 TFSI/LiTFSI does not decompose in even larger potential range than used here, 41 the reductive decomposition of electrolyte is most likely due to GBL as observed earlier at similar potentials in LiCoO 2 /graphite cell. 42 Although decomposition products of PYR 14 TFSI/GBL/LiTFSI electrolyte does not affect the capacity retention of bottle-like cell used here, they may affect the performance of coin type cell in which degradation products remain at the interface where they are formed. In order to investigate the influence of temperature on the insertion of lithium ion into anatase TiO 2 NTAs, CV experiments at elevated temperatures up to 55…”

Section: Resultsmentioning

confidence: 83%

Electrochemical Performance of Anatase TiO₂Nanotube Arrays Electrode in Ionic Liquid Based Electrolyte for Lithium Ion Batteries

Zec

Cvjetićanin

Bešter‐Rogač

et al. 2017

J. Electrochem. Soc.

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Ternary electrolyte composed of 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide ionic liquid (PYR 14 TFSI), γ-butyrolactone (GBL) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and anatase TiO 2 nanotube arrays (NTAs) electrode are investigated for the application in new generation of lithium-ion batteries (LIBs). The electrical conductivity and viscosity are measured in the whole composition range at several temperatures. Also, cyclic voltammetry experiments are performed at different temperatures and scan rates. At all scan rates, up to 100 mV · s −1 Ti 4+ /Ti 3+ redox peaks appear designating exceptionally fast intercalation/deintercalation reaction. At the end of cycling the intercalation/deintercalation capacity was 144.8/140.7 mAh · g −1 at current rate 3 C. The diffusion coefficient for Li + extraction from TiO 2 nanotubes (NTs) have been calculated for temperatures from (25 to 55) • C. Activation energy for diffusion was found to be 54.7 kJ/mol (0.57 eV The rapid development of portable electronic devices and technologies significantly increased demand for the next generation of energy storage systems.1 Because of enhanced energy and power density, efficiency and long life, LIBs are currently one of the most promising energy storage devices.2,3 Improvement of safety standards and low impact on human health and environment is essential for large-scale application of LIBs. 4 Safety concerns related to utilization of highly volatile and flammable organic solvents in commercial cells can be addressed by introducing ionic liquids (ILs) as emerging class of fluids.5 Numerous advantages of ILs such as negligible vapor pressure and high chemical and thermal stability make them ideal candidates for their application in LIBs. Potential application of ILs based on a combination of the pyrrolidinium (PYR + ) cation and bis(trifluoromethanesulfonyl)imide (TFSI -) anion as electrolytes in LIBs with long term cycling stability and very good capacity utilization, has been confirmed by several research groups. [6][7][8][9][10][11][12] Nevertheless, the utilization of IL-based electrolytes is usually limited by their high viscosity, which reduces transport capabilities and slows down the chemical processes that occur in these solvents. Mixing of ionic liquids with molecular solvents such as organic carbonates or lactones can reduce viscosity of applied electrolyte. 12-15Among other aprotic solvents, γ-butyrolactone (GBL) is usually applied in new generation of LIBs and other electrochemical devices. Besides its low cost, GBL has wide liquidus range and better thermal stability comparing to alkyl carbonate solvents. 16 In our previous papers we demonstrated that binary mixture of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, (IM 14 TFSI), and GBL has around 20% higher specific conductivity at low IL mole fractions compared to IM 14 TFSI + propylene carbonate (PC) binary mixture.15,17 Xu et al. observed similar trend in the case of 1-ethyl-3-methylimidazolium dicyanamide (IM 12 DC...

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Section: Resultsmentioning

confidence: 83%

Electrochemical Performance of Anatase TiO₂Nanotube Arrays Electrode in Ionic Liquid Based Electrolyte for Lithium Ion Batteries

Zec

Cvjetićanin

Bešter‐Rogač

et al. 2017

J. Electrochem. Soc.

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“…Decomposition of the ionic liquids is observed just above 400°C (e.g., EtMeImNTf 2 decomposed between 440 and 480°C [51]). However, GBL has a high boiling point (207°C at the atmospheric pressure) [28], but it does not exceed 230°C. GBL molecules in 0.7 M LiNTf 2 in MePrPyrNTf 2 are probably involved in ion salvation and hence they are non-volatile.…”

Section: Galvanostatic Charging/dischargingmentioning

confidence: 99%

“…Gamma-butyrolactone (GBL) has a high boiling point, a low freezing point, a high flashing point, a high dielectric constant, and low viscosity [28,29]. This low vapor pressure molecular solvent is a highly preferable co-solvent for lithium-ion batteries.…”

Section: Introductionmentioning

confidence: 99%

Properties of LiMn2O4 cathode in electrolyte based on ionic liquid with and without gamma-butyrolactone

Swiderska‐Mocek

2013

J Solid State Electrochem

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LiMn 2 O 4 was examined as a cathode material for the lithium-ion battery, working together with a room temperature ionic liquid electrolyte, obtained by dissolution of solid lithium bis(trifluoromethanesulphonyl)imide (LiNTf 2 ) in liquid N-methyl-N-propylpyrrolidinium bis (trifluoromethanesulphonyl) imide (MePrPyrNTf 2 ) with and without gamma-butyrolactone (GBL). The Li/LiMn 2 O 4 cell was tested by cyclic voltammetry, galvanostatic charging/ discharging, and with impedance spectroscopy. In the cyclic voltammograms for these electrolytes pairs of oxidation current peaks and reduction current peaks for the cathode are distinct, revealing typical characteristics of two-stage reversible-phase transformation of the spinel. The LiMn 2 O 4 cathode showed good cyclability and Coulombic efficiency (126 mAh g −1 after 50 cycles) working together with 0.7 M LiNTf 2 in MePrPyrNTf 2 +10 wt%. GBL ionic liquid electrolyte. At the C/7and C/5 rates, the LiMn 2 O 4 showed stable capacities of 124 and 120 mAh g −1 , respectively. Scanning electron microscopy images of pristine electrodes and those taken after electrochemical cycling showed changes which may be interpreted as a result of solid electrolyte interphase formation. The 0.7 M LiNTf 2 in MePrPyrNTf 2 and 0.7 M LiNTf 2 in MePrPyrNTf 2 +10 wt%. GBL electrolytes have a greater thermal stability range (no peak is observed below 230°C).

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“…In addition, in some papers, only the LiC 6 anode was studied [11,[23][24][25][27][28][29][30], while in others, the complete cell was tested [13,[36][37][38][39][40][41]. The additives improving Li and LiC 6 performance were usually tested in electrolytes based on cyclic carbonates or carbonate mixtures, exhibiting SEI forming properties by themselves.…”

Section: Additivesmentioning

confidence: 99%

“…The non-volatility of room temperature ionic liquids is important from the point of view of their possible application as non-flammable electrolytes in lithium and Li-ion batteries [9][10][11][12]. Another approach is to find a low vapour pressure molecular solvent, for example γ-butyrolactone (γ-BL, T b 0205°C) [13] or tetramethylene sulfone (TMS, T b 0280°C) [14]. However, unconventional systems, such as ionic liquids and high boiling point solvents (γ-BL, TMS) do not form SEI protective layer but rather resistive corrosion products.…”

Section: Introductionmentioning

confidence: 99%

Solid electrolyte interphase formation on metallic lithium

Lewandowski

Swiderska‐Mocek

Waliszewski

2012

J Solid State Electrochem

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Solutions of three salts (LiBF 4 , LiNTf 2 , LiPF 6 ) in N-methyl-2-pyrrolidone (NMP), selected arbitrarily as a reference solvent, were investigated by electrochemical impedance spectroscopy (EIS) and scanning electron microscopy techniques. The lithium surface in contact with LiPF 6 in NMP electrolyte was covered with a protective layer (SEI) which morphology comprise small particles (of ca. 0.2 μm in radius). This salt was selected for further studies. The impedance of the Li|(LiPF 6 in NMP+additive)|Li system was measured immediately after cell assembly and after galvanostatic charging/discharging. Fifteen different additives (10 wt.%) were used. The efficiency of individual additives was evaluated in terms of the Li|electrolyte system resistance (ΔR) or total cell impedance reduction, both deduced from EIS. Some of the additives were able to form the SEI layer and to reduce resistance/impedance of the Li| electrolyte interphase. In such cases, the lithium surface was covered with relatively uniform conglomerates, or regions separated by cracks, of ca. 1-2 μm in dimension.

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Effects of cyclic carbonates as additives to γ-butyrolactone electrolytes for rechargeable lithium cells

Cited by 69 publications

References 7 publications

Electrochemical Performance of Anatase TiO₂Nanotube Arrays Electrode in Ionic Liquid Based Electrolyte for Lithium Ion Batteries

Electrochemical Performance of Anatase TiO₂Nanotube Arrays Electrode in Ionic Liquid Based Electrolyte for Lithium Ion Batteries

Properties of LiMn2O4 cathode in electrolyte based on ionic liquid with and without gamma-butyrolactone

Solid electrolyte interphase formation on metallic lithium

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Effects of cyclic carbonates as additives to γ-butyrolactone electrolytes for rechargeable lithium cells

Cited by 69 publications

References 7 publications

Electrochemical Performance of Anatase TiO2Nanotube Arrays Electrode in Ionic Liquid Based Electrolyte for Lithium Ion Batteries

Electrochemical Performance of Anatase TiO2Nanotube Arrays Electrode in Ionic Liquid Based Electrolyte for Lithium Ion Batteries

Properties of LiMn2O4 cathode in electrolyte based on ionic liquid with and without gamma-butyrolactone

Solid electrolyte interphase formation on metallic lithium

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Product

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Electrochemical Performance of Anatase TiO₂Nanotube Arrays Electrode in Ionic Liquid Based Electrolyte for Lithium Ion Batteries

Electrochemical Performance of Anatase TiO₂Nanotube Arrays Electrode in Ionic Liquid Based Electrolyte for Lithium Ion Batteries