LiFePO4 and graphite electrodes with ionic liquids based on bis(fluorosulfonyl)imide (FSI)− for Li-ion batteries

Guerfi, Abdelbast; Duchesne, Steve; Kobayashi, Yo; Vijh, Ashok K.; Zaghib, Karim

doi:10.1016/j.jpowsour.2007.09.030

Cited by 245 publications

(185 citation statements)

References 21 publications

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“…The pre-treated cell showed enhanced compatibility and better cycle properties [19]. In the present study, two methods were used to improve the poor compatibility of guanidinium-based RTIL electrolyte towards the LiFePO 4 cathode.…”

Section: Battery Performancementioning

confidence: 97%

“…The coulombic efficiency of the cell during the first cycle was 83.7%, which was a result of electrolyte decomposition and SEI formation, and in subsequent cycles it remained close to 100%. Guerfi et al [19] used N-methyl-N-propylpyrrolidiniumbis(fluorsulfonyl)imide (Py13-FSI) as a safe electrolyte with a LiFePO 4 cathode in lithium rechargeable cells. To improve the compatibility of the RTIL towards the cathode, LiFePO 4 was pre-treated by immersion in the Py13FSI/ LiFSI RTIL, and then placed under vacuum at 60°C for 8 h.…”

Section: Battery Performancementioning

confidence: 99%

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Li/LiFePO4 battery performance with a guanidinium-based ionic liquid as the electrolyte

et al. 2011

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A new guanidinium-based ionic liquid (IL) was investigated as a novel electrolyte for a lithium rechargeable battery. The viscosity, conductivity, lithium redox behavior, and charge-discharge characteristics of the lithium rechargeable batteries were investigated for the IL electrolyte with 0.3 mol kg −1 lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt. Li/ LiFePO 4 cells incorporating the IL electrolyte without additives showed good cycle properties at a charge-discharge current rate of 0.1 C, and exhibited good rate capabilities in the presence of a mass fraction of 10% vinylene carbonate or gamma-butyrolactone. The popularity of lithium rechargeable batteries has increased over the last two decades because of the demand for portable energy storage devices. Conventional organic electrolytes used in lithium rechargeable batteries are composed of organic solvents and inorganic salts. These batteries have a working temperature range from −20-50°C, which restricts the applications for lithium rechargeable batteries. There are also safety concerns over the organic solvents, which are volatile and flammable with flash points mostly below 30°C [1,2]. To overcome these, new and safe electrolytes need to be developed. Room temperature ionic liquids (RTILs) that consist of only cations and anions are non-volatile, non-flammable, and have high thermal stability, which makes them promising for application as electrolytes [3,4]. These new electrolytes can be combined electrodes such as lithium iron phosphate (LiFePO 4 ), which has a high theoretical capacity, low cost, and low environmental impact [5][6][7].Li/LiFePO 4 cells with RTILs-based electrolytes (flash point is >300°C) show good efficiency [8]. Unfortunately, RTILs-based electrolytes exhibit higher viscosity, lower conductivity and reduced compatibility with electrodes compared to conventional organic electrolytes, and this leads to relatively poor cell performance [9,10]. To resolve these problems, some organic additives such as ethylene carbonate and vinylene carbonate (VC) have been added to obtain a stable solid electrolyte interface (SEI) on the electrode [11][12][13][14][15].Recently, our group [16] synthesized a series of hydrophobic RTILs based on small guanidinium cations and the bis(trifluoromethanesulfonyl)imide (TFSI) anion. Both 1g13-TFSI (N-methyl-N-propyl-N′,N′,N″,N″-tetramethylguanidinium-TFSI) and 1g22TFSI (N,N-diethyl-N′,N′,N″,N″-tetramethylguanidinium-TFSI) could be used as electrolytes for Li/LiCoO 2 lithium rechargeable batteries [17]. Although the cells with guanidinium-based electrolytes had good capacities, they exhibited unfavorable cycle properties. In this study, a new guanidinium RTIL, 1g14TFSI (Figure 1), was investigated as a novel electrolyte for Li/LiFePO 4 lithium rechargeable batteries. Both VC and gamma-butyrolactone (GBL) were investigated as additives to the 1g14TFSI-based electrolyte, and their influence on electrochemical performance was studied using charge-discharge tests.

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Section: Battery Performancementioning

confidence: 97%

Section: Battery Performancementioning

confidence: 99%

Li/LiFePO4 battery performance with a guanidinium-based ionic liquid as the electrolyte

et al. 2011

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“…Regardless of its high working potential, the material exhibits relatively low coulombic efficiency and poor specific capacity compared with other reported Fe-or Co-based polyanionic compounds in both organic and ionic liquid electrolytes. 36,37 The inferior electrochemical behavior of the Ni-based compound with respect to Fe-and Co-based analogs may be attributed to the intrinsic lower ionic conductivity of the former material. Sanz et al 12 have reported that the Ni-based compound exhibits the lowest ionic conductivity of ∼ 2.1 × 10 − 7 S cm − 1 at 300°C, with respect to Fe, Mn and Co.…”

Section: Exploring the Ni Redox Activity In Polyanionic Compoundsmentioning

confidence: 99%

Exploring the Ni redox activity in polyanionic compounds as conceivable high potential cathodes for Na rechargeable batteries

et al. 2017

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Although nickel-based polyanionic compounds are expected to exhibit a high operating voltage for batteries based on the Ni 2+/3+ redox couple activity, some rare experimental studies on the electrochemical performance of these materials are reported, resulting from the poor kinetics of the bulk materials in both Li and Na nonaqueous systems. Herein, the electrochemical activity of the Ni 2+/3+ redox couple in the mixed-polyanionic framework Na 4 Ni 3 (PO 4 ) 2 (P 2 O 7 ) is reported for the first time. This novel material exhibits a remarkably high operating voltage when cycled in sodium cells in both carbonate-and ionic liquid-based electrolytes. The application of a carbon coating and the use of an ionic liquid-based electrolyte enable the reversible sodium ion (de-)insertion in the host structure accompanied by the redox activity of Ni 2+/3+ at operating voltages as high as 4.8 V vs Na/Na + . These results present the realization of Ni-based mixed polyanionic compounds with improved electrochemical activity and pave the way for the discovery of new Na-based high potential cathode materials. NPG Asia Materials (2017) 9, e370; doi:10.1038/am.2017.41; published online 31 March 2017 INTRODUCTION Lithium-ion batteries have been largely recognized as the most efficient electrochemical energy storage devices for both portable electronics and electric vehicle applications. 1,2 However, the growth and diversification of the energy storage market trigger interest in low-cost and environmentally friendly alternative systems. In addition, recent concerns over the cost and future availability of lithium highlight the urgent need to exploit alternative energy storage systems. 3 In these terms, sodium (Na)-ion batteries are attractive candidates because of the electrochemistry that is similar to the well-established lithium-ion technology. 4 To date, the LiFePO 4 olivine with (PO 4 ) 3 − polyanionic framework, owing to its superior thermal stability and low cost, is considered to be one of the best electrode materials for lithium-ion batteries, mostly in view of its stable operating voltage and satisfactory specific capacity. However, the intrinsic tunability of the operating voltage of polyanionic compounds because of the presence of different transition metals such as Mn, Co and Ni 5-7 has triggered interest in alternative frameworks exhibiting higher cell voltages. According to theoretical prediction, lithium nickel phosphate has a remarkably high working potential (~5.1 V vs Li + /Li) because of the Ni 2+/3+ redox activity. 8 Unfortunately, several studies have demonstrated that the implementation of this material is restricted by several drawbacks such as the intrinsic sluggish kinetics attributable to the low electronic conductivity, the poor lithium transport in commonly used electrolyte systems and the structural

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“…12,13 In addition, we have investigated the electrochemical behavior of a high-capacitive Si-C composite anode in an FSI-based ionic liquid electrolyte, in which galvanostatic cycling of the anode in the ionic liquid with a charge limitation of 800 mAh g ¹1 is stable for 50 cycles. 14 Matsumoto et al, 1517 Guerfi et al, 18 and Seki et al 19 also reported the advantages of FSI-based ionic liquids for lithium-metal/lithium-ion batteries.…”

Section: Introductionmentioning

confidence: 99%

Charge-Discharge Characteristics of a LiNi1/3Mn1/3Co1/3O2 Cathode in FSI-based Ionic Liquids

et al. 2012

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We evaluated the charge-discharge behavior of a LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC) electrode in a 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMImFSI) ionic liquid. At 163 mAh g −1 after 50 cycles, the discharge capacity of the NMC cathode in LiTFSI/EMImFSI (TFSI − = bis(trifluoromethylsulfonyl)imide) at 1.0 C in the voltage range 3.0-4.5 V (vs. Li/Li + ) is comparable to that in the conventional electrolyte, LiPF 6 /EC+DMC. Moreover, the rate capability of the cell with LiTFSI/EMImFSI exceeded that with LiPF 6 /EC+DMC, especially at high rates, probably owing to the low resistance at the electrode/electrolyte interface. These results suggest that EMImFSI is a suitable electrolyte for lithium-ion batteries utilizing an NMC cathode.

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LiFePO4 and graphite electrodes with ionic liquids based on bis(fluorosulfonyl)imide (FSI)− for Li-ion batteries

Cited by 245 publications

References 21 publications

Li/LiFePO4 battery performance with a guanidinium-based ionic liquid as the electrolyte

Li/LiFePO4 battery performance with a guanidinium-based ionic liquid as the electrolyte

Exploring the Ni redox activity in polyanionic compounds as conceivable high potential cathodes for Na rechargeable batteries

Charge-Discharge Characteristics of a LiNi1/3Mn1/3Co1/3O2 Cathode in FSI-based Ionic Liquids

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