Bis(fluoromalonato)borate (BFMB) anion based ionic liquid as an additive for lithium-ion battery electrolytes

Xiao Guang Sun; Chen Liao; Loïc Baggetto; Bingkun Guo; Raymond R. Unocic; Gabriel M. Veith; Sheng Dai

doi:10.1039/c3ta14943a

Bis(fluoromalonato)borate (BFMB) anion based ionic liquid as an additive for lithium-ion battery electrolytes

Xiao Guang Sun, Chen Liao, Loïc Baggetto, Bingkun Guo, Raymond R. Unocic, Gabriel M. Veith, Sheng Dai

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

Propylene carbonate (PC) is a good solvent for lithium ion battery applications due to its low melting point and high dielectric constant. However, PC is easily intercalated into graphite causing it to exfoliate, killing its electrochemical performance. Here we report on the synthesis of a new ionic liquid electrolyte based on partially fluorinated borate anion, 1-butyl-1,2-dimethylimidazolium bis(fluoromalonato)borate (BDMIm·BFMB), which can be used as an additive in 1 M LiPF₆/PC electrolyte to suppress graphite exfoliation and improve cycling performance. In addition, both PC and BDMIm·BFMB can be used synergistically as additive to 1.0 M LiPF₆/methyl isopropyl sulfone (MIPS) to dramatically improve its cycling performance. It is also found that the chemistry nature of the ionic liquids has dramatic effect on their role as additive in PC based electrolyte.

Original language	English
Pages (from-to)	7606-7614
Number of pages	9
Journal	Journal of Materials Chemistry A
Volume	2
Issue number	20
DOIs	https://doi.org/10.1039/c3ta14943a
State	Published - May 28 2014

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title = "Bis(fluoromalonato)borate (BFMB) anion based ionic liquid as an additive for lithium-ion battery electrolytes",

abstract = "Propylene carbonate (PC) is a good solvent for lithium ion battery applications due to its low melting point and high dielectric constant. However, PC is easily intercalated into graphite causing it to exfoliate, killing its electrochemical performance. Here we report on the synthesis of a new ionic liquid electrolyte based on partially fluorinated borate anion, 1-butyl-1,2-dimethylimidazolium bis(fluoromalonato)borate (BDMIm·BFMB), which can be used as an additive in 1 M LiPF6/PC electrolyte to suppress graphite exfoliation and improve cycling performance. In addition, both PC and BDMIm·BFMB can be used synergistically as additive to 1.0 M LiPF6/methyl isopropyl sulfone (MIPS) to dramatically improve its cycling performance. It is also found that the chemistry nature of the ionic liquids has dramatic effect on their role as additive in PC based electrolyte.",

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T1 - Bis(fluoromalonato)borate (BFMB) anion based ionic liquid as an additive for lithium-ion battery electrolytes

AU - Sun, Xiao Guang

AU - Liao, Chen

AU - Baggetto, Loïc

AU - Guo, Bingkun

AU - Unocic, Raymond R.

AU - Veith, Gabriel M.

AU - Dai, Sheng

PY - 2014/5/28

Y1 - 2014/5/28

N2 - Propylene carbonate (PC) is a good solvent for lithium ion battery applications due to its low melting point and high dielectric constant. However, PC is easily intercalated into graphite causing it to exfoliate, killing its electrochemical performance. Here we report on the synthesis of a new ionic liquid electrolyte based on partially fluorinated borate anion, 1-butyl-1,2-dimethylimidazolium bis(fluoromalonato)borate (BDMIm·BFMB), which can be used as an additive in 1 M LiPF6/PC electrolyte to suppress graphite exfoliation and improve cycling performance. In addition, both PC and BDMIm·BFMB can be used synergistically as additive to 1.0 M LiPF6/methyl isopropyl sulfone (MIPS) to dramatically improve its cycling performance. It is also found that the chemistry nature of the ionic liquids has dramatic effect on their role as additive in PC based electrolyte.

AB - Propylene carbonate (PC) is a good solvent for lithium ion battery applications due to its low melting point and high dielectric constant. However, PC is easily intercalated into graphite causing it to exfoliate, killing its electrochemical performance. Here we report on the synthesis of a new ionic liquid electrolyte based on partially fluorinated borate anion, 1-butyl-1,2-dimethylimidazolium bis(fluoromalonato)borate (BDMIm·BFMB), which can be used as an additive in 1 M LiPF6/PC electrolyte to suppress graphite exfoliation and improve cycling performance. In addition, both PC and BDMIm·BFMB can be used synergistically as additive to 1.0 M LiPF6/methyl isopropyl sulfone (MIPS) to dramatically improve its cycling performance. It is also found that the chemistry nature of the ionic liquids has dramatic effect on their role as additive in PC based electrolyte.

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Bis(fluoromalonato)borate (BFMB) anion based ionic liquid as an additive for lithium-ion battery electrolytes

Abstract

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