Solid-state Li/LiFePO4 polymer electrolyte batteries incorporating an ionic liquid cycled at 40°C

Shin, Joon‐Ho; Henderson, Wesley A.; Scaccia, Silvera; Prosini, Pier Paolo; Passerini, Stefano

doi:10.1016/j.jpowsour.2005.06.026

Cited by 185 publications

(115 citation statements)

References 25 publications

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“…The works with a reasonable discharge capacity (ca. 130 mAh g -1 ) at a moderately increased temperature (40°C) [5,28,29]. Similarly, the temperature effect was found in the case of the Li/ LiFePO 4 cell working together with polymer electrolytes based on the quaternary ammonium cation, [NTf 2 -] anion and different co-polymers [30,31].…”

Section: Sei Formationmentioning

confidence: 52%

“…The LiFePO 4 cathode was studied in a series of ILs or polymer electrolytes based on ILs [5,13,[27][28][29][30][31][32][33]. Ionic liquids were based on pyrazolium, pyrrolidinium, imidazolium and tetraalkylammonium cations as well as -]/ LiFePO 4 cell worked with a capacity of 126 mAh g -1 at a C/10 rate without any molecular additive to the electrolyte [13].…”

Section: Sei Formationmentioning

confidence: 99%

“…used in Li ion cells are flammable due to the relatively high vapor pressure. However, conventional electrolytes may be replaced by practically nonvolatile and hence, nonflammable solventfree ionic liquids (ILs) [1][2][3][4][5][6][7][8]. Dissolution of a solid lithium salt LiX in a room temperature ionic liquid [A ?…”

Section: Introductionmentioning

confidence: 99%

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LiFePO4 cathode in N-methyl-N-propylpiperidinium and N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide

2010

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Ternary [Li ? ][MePrPip ? ][NTf 2 -] and [Li ? ] [MePrPyrr ? ][NTf 2 -] room temperature ionic liquids (ILs) were obtained by dissolution of solid lithium bis(trifluoromethanesulfonyl)imide (LiNTf 2 ) in liquid N-methyl-Npropylpiperidinium bis(trifluoromethanesulfonyl)imide and N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide, respectively, and studied as electrolytes for the use in Li/LiFePO 4 or C(Li)/LiFePO 4 batteries. The cell worked properly in the presence of 10 wt% of vinylene carbonate (VC). Impedance-spectroscopy studies showed that the additive (VC) forms a protective coating on the anode. The LiFePO 4 cathode shows good efficiency (135 mAh g -1 ) working together with [Li ? ][MePrPip ? ][NTf 2 -] ? VC and [Li ? ][MePrPyrr ? ][NTf 2 -] ? VC ionic liquid electrolytes.The flash point of ionic liquid electrolytes containing 10 wt% of VC is above 300°C, which makes them practically nonflammable.

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Section: Sei Formationmentioning

confidence: 52%

Section: Sei Formationmentioning

confidence: 99%

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LiFePO4 cathode in N-methyl-N-propylpiperidinium and N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide

2010

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“…Ionic liquids (ILs), namely room temperature molten salts, have been attracting much attention used as electrolytes in lithium ion batteries by their unique properties such as no measurable vapor pressure, non-flammability, high thermal, and electrochemical stability, high conductivity in wide temperature range [4,5]. The replacement of flammable organic electrolyte with ILs would greatly improve the safety of lithium ion batteries.…”

Section: Introductionmentioning

confidence: 99%

Vinyl ethylene carbonate as an additive to ionic liquid electrolyte for lithium ion batteries

Chen

Qiu

et al. 2009

J Appl Electrochem

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In this research, we investigated the potential application of vinyl ethylene carbonate (VEC) and ethylene carbonate (EC) as solid electrolyte interface (SEI) filmforming additive in 1-ethyl-3-methylimidazolium (EMI)-bis(trifluoromethyl-sulfonyl) imide (TFSI)-LiTFSI ionic liquid electrolyte (IL). The electrochemical performance of natural graphite (NG7) was studied in LiTFSI/EMI-TFSI containing different weight percent of EC/VEC via cyclic voltammetry (CV), electrochemical impedance spectrum (EIS), and galvanostatic charge/discharge cycles. Temperature effect on the discharge/charge performance of NG7 electrode in the researched IL electrolyte was also discussed.

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“…[5][6][7] Low conductivity in polymer electrolytes have recently been addressed by Shin and coworkers by the addition of room temperature ionic liquids (RTILs) to PEO. [8][9][10][11][12] Ionic liquids typically consist of an asymmetric organic cation and a bulky anion with a highly delocalized charge to minimize packing. RTILs are both nonvolatile and nonflammable, thereby maintaining the safety advantage of the polymer electrolyte while adding a liquid component.…”

Section: Introductionmentioning

confidence: 99%

Composite Electrolytes for Lithium Batteries: Ionic Liquids in APTES Cross-Linked Polymers

2007

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Solvent free polymer electrolytes were made consisting of Li + and pyrrolidinium salts of trifluoromethanesulfonimide added to a series of hyperbranched poly(ethylene oxide)s (PEO). The polymers were connected by triazine linkages and crosslinked by a sol-gel process to provide mechanical strength. The connecting PEO groups were varied to help understand the effects of polymer structure on electrolyte conductivity in the presence of ionic liquids. Polymers were also made that contain poly(dimethylsiloxane) groups, which provide increased flexibility without interacting with lithium ions. When large amounts of ionic liquid are added, there is little dependence of conductivity on the polymer structure. However, when smaller amounts of ionic liquid are added, the inherent conductivity of the polymer becomes a factor. These electrolytes are more conductive than those made with high molecular weight PEO imbibed with ionic liquids at ambient temperatures, due to the amorphous nature of the polymer.

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Solid-state Li/LiFePO4 polymer electrolyte batteries incorporating an ionic liquid cycled at 40°C

Cited by 185 publications

References 25 publications

LiFePO4 cathode in N-methyl-N-propylpiperidinium and N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide

LiFePO4 cathode in N-methyl-N-propylpiperidinium and N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide

Vinyl ethylene carbonate as an additive to ionic liquid electrolyte for lithium ion batteries

Composite Electrolytes for Lithium Batteries: Ionic Liquids in APTES Cross-Linked Polymers

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