The Effect of Additives in Room Temperature Molten Salt - based Lithium Battery Electrolytes

Egashira, Makoto; Kiyabu, Toshiyasu; Watanabe, Izumi; Okada, Shigeto; Yamaki, Jun Ichi

doi:10.5796/electrochemistry.71.1114

Cited by 32 publications

(7 citation statements)

References 11 publications

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“…The second way is to use additives that can form a solid electrolyte interface ͑SEI͒ film on the lithium anode and prevent the cathodic reduction physically or kinetically. 15,16 The last way is to employ other anode active materials possessing a higher reduction potential than metallic Li 3 . For example, lithiated metal oxide, Li 4 Ti 5 O 12 , 3 which provides an intercalation/extraction potential of around 1.5 V vs Li + /Li ͑Ϫ1.5 V vs Ag + /Ag͒, can be used for this purpose.…”

mentioning

confidence: 99%

Performance of NASICON Symmetric Cell with Ionic Liquid Electrolyte

Plashnitsa¹,

Kobayashi²,

Noguchi

et al. 2010

J. Electrochem. Soc.

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244

226

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To improve the thermal stability of lithium- and sodium-ion batteries, the room-temperature molten salts LiBF4 /1-ethyl-3-methyl imidazolium tetrafluoroborate (EMIBF4) and NaBF4/EMIBF4 were used as ionic liquid (IL) electrolytes instead of flammable carbonate-type organic electrolyte solvents. To avoid cathodic decomposition of the IL electrolytes, a symmetric cell configuration with Na Superionic CONductor (NASICON)-type normalA3normalV2(PO4)3 (where A is Li or Na) as both cathode and anode was tried in a coin-type cell (type 2320). As a result, both the polyanionic-based Li3normalV2(PO4)3 (LVP) as well as Na3normalV2(PO4)3 (NVP) symmetric cells using organic electrolytes were found to operate as secondary batteries and exhibited satisfactory electrochemical performances. The substitution of the organic electrolytes by the appropriate IL electrolytes in both cases resulted in the reduction in the first discharge capacities. However, the IL-based cells revealed better cyclability and a more stable behavior at elevated temperatures. The obtained electrochemical behavior of the symmetric cells was confirmed by the complex impedance measurements at 25 and 80°C . In addition, the thermal stability of LVP and NVP with the IL electrolytes was also examined.

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mentioning

confidence: 99%

Performance of NASICON Symmetric Cell with Ionic Liquid Electrolyte

Plashnitsa¹,

Kobayashi²,

Noguchi

et al. 2010

J. Electrochem. Soc.

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244

226

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“…In practical viewpoints, conductivity of such gel electrolytes and the interfacial stability between electrodes and the gel electrolytes are to be improved. On liquid-phase electrolyte, the addition of carbonate solvents into ionic liquid appears to be effective to improve such problems [1][2][3][4]. In the present study, a series of gel electrolytes consisting of ionic liquids containing ethylene carbonate (EC) as additive and a methylmethacrylate polymer matrix having poly(ethylene oxide) side chain (PEO-PMA) were prepared, and the effect of the addition of EC on the conductivity and interfacial stability has been estimated.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Ethylene Carbonate Addition on the Properties of Ionic Liquid-based Gel Electrolyte

Egashira,

Kanetomo,

Yoshimoto

et al. 2008

Meet. Abstr.

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“…For example, batteries using ionic liquids based on 1-ethyl-3-methylimidazolium (EMI) cation as electrolytes has been reported (2). EMI ionic liquids have relatively low viscosity, but the reduction stability is insufficient without any additives (3). However, the ionic liquids need to have both low viscosity and a wide electrochemical window.…”

Section: Introductionmentioning

confidence: 99%

Cycle Performance of Lithium-Ion Batteries Containing Ionic Liquids with Improved Reduction Stability

et al. 2013

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The high-temperature cycling performance of lithium-ion batteries containing a new series of ionic liquids based on an aliphatic quaternary ammonium cation and a bis(fluorosulfonyl)amide anion were investigated, by conducting charge-discharge cycling tests of graphite / LiFePO4 cells. The new series of ionic liquids were 1,3-dimethyl-1-propylpiperidinium bis(fluorosulfonyl)amide (3mPP13-FSA) and 7-methyl-5-azoniaspiro[4,5]decane bis(fluorosulfonyl)amide (7mAS45-FSA), which were obtained by introducing methyl groups to known compounds. The relationship between a change in electronic structure and reduction stability was researched. Introducing methyl group improved reduction stability as electron-donating ability. Further, melting points were lowered owing to the asymmetric structures of the cations. The electrochemical properties of these ionic liquids were evaluated by linear sweep voltammetry. The cycle performance of graphite/LiFePO4 cells containing these ionic liquids for the electrolytes was improved compared with that of cells containing organic electrolytes based on LiPF6/ECDEC, and the capacity retention ratios were more than 50% at the 500th cycle at 60°C.

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The Effect of Additives in Room Temperature Molten Salt - based Lithium Battery Electrolytes

Cited by 32 publications

References 11 publications

Performance of NASICON Symmetric Cell with Ionic Liquid Electrolyte

Performance of NASICON Symmetric Cell with Ionic Liquid Electrolyte

The Effect of the Ethylene Carbonate Addition on the Properties of Ionic Liquid-based Gel Electrolyte

Cycle Performance of Lithium-Ion Batteries Containing Ionic Liquids with Improved Reduction Stability

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