Stable cycling of graphite in an ionic liquid based electrolyte

Holzapfel, Michael; Jost, Carsten; Novák, Petr

doi:10.1039/b407526a

Cited by 157 publications

(126 citation statements)

References 11 publications

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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%

“…In addition, there are very few works testing metallic-lithium [20][21][22], while in the case of the graphite anode, there are numerous studies. In the latter case attention is focused on charging/discharging efficiency [23][24][25][26][27][28][29], SEM observations of the graphite surface [8, 14, 23-25, 27, 29-31] and EIS analysis [23,24,29,30,[32][33][34][35].…”

Section: Additivesmentioning

confidence: 99%

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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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Section: Additivesmentioning

confidence: 99%

Section: Additivesmentioning

confidence: 99%

Solid electrolyte interphase formation on metallic lithium

Lewandowski

Swiderska‐Mocek

Waliszewski

2012

J Solid State Electrochem

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“…Thus, many reports have demonstrated the use of ionic liquid electrolytes and shown their high potential for the development of LIBs. [20][21][22][23][24][25][26][27][28][29][30] However, compared with conventional organic solvent-based electrolytes, most of these ionic liquids, have drawbacks, such as relatively high viscosity and low ionic conductivity resulting in lower charge-discharge rate capability and poor low-temperature characteristics in LIB cells. We successfully identified a promising ionic liquid that contains bis(fluorosulfonyl)imide (FSI ¹ ) as an anion.…”

Section: Introductionmentioning

confidence: 99%

The First Lithium-ion Battery with Ionic Liquid Electrolyte Demonstrated in Extreme Environment of Space

et al. 2015

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A prototype lithium-ion battery with a bis(fluorosulfonyl)imide (FSI)-based ionic liquid electrolyte was developed. The prototype was mounted on a demonstration module of the "Hodoyoshi-3" microsatellite, which was successfully launched on June 20, 2014. Qualification tests for space application, including radiation tolerance and vacuum tests, revealed negligible degradation of the ionic liquid-based lithium-ion battery (IL-LIB) cell. According to the flight data, the IL-LIB cell can exist stably in an ultra-high vacuum environment despite its thin and flexible pouch casing without any rigid anti-vacuum reinforcements. Furthermore, the power unit showed the same charge-discharge performance as that predicted by the charge-discharge behavior of an identical cell on the ground, suggesting that the IL-LIB cell maintains performance in high vacuum a microgravity environment. These results prove that LIB cells with FSI-based ionic liquids can be used as a power source for space applications.

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“…Ionic liquids have been proposed as potential electrolytes for electrochemical capacitors and lithium-ion batteries, mainly due to their nonvolatility and hence, non-flammability [8,[11][12][13][14][15][16][17][18][19][20]. Among ILs, those based on 1-ethyl-3-methyl-imidazolium [ [12,13,18,19,[21][22][23], as well as with graphite, LaSi 2 /Si and TiO 2 nanotube anodes [14,20,24,25]. Recently, ionic liquids based on imidazolium and piperidinium cations with vinyl or allyl groups and [NTf 2 − ] anion are of great interest as co-solvents for the Li-ion battery (LiNi 0.5 Mn 1.5 O 4 and LiFePO 4 ) [26,27].…”

Section: Introductionmentioning

confidence: 99%

“…Salt liquids at room temperature, usually called room temperature ionic liquids or simply ionic liquids (IL), show considerable thermal stability, a wide liquid-phase range, non-flammability, negligible vapor pressure, and broad electrochemical stability [8][9][10]. Ionic liquids have been proposed as potential electrolytes for electrochemical capacitors and lithium-ion batteries, mainly due to their nonvolatility and hence, non-flammability [8,[11][12][13][14][15][16][17][18][19][20]. Among ILs, those based on 1-ethyl-3-methyl-imidazolium [ [12,13,18,19,[21][22][23], as well as with graphite, LaSi 2 /Si and TiO 2 nanotube anodes [14,20,24,25].…”

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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Stable cycling of graphite in an ionic liquid based electrolyte

Abstract: 1-Ethyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)imide (EMI-TFSI) has been shown to reversibly permit lithium intercalation into standard graphite when vinylene carbonate is used in small amounts as an additive.

Cited by 157 publications

References 11 publications

Solid electrolyte interphase formation on metallic lithium

Solid electrolyte interphase formation on metallic lithium

The First Lithium-ion Battery with Ionic Liquid Electrolyte Demonstrated in Extreme Environment of Space

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

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