High flash point electrolyte for use in lithium-ion batteries

  • Isken P
  • Dippel C
  • Schmitz R
 et al. 
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Abstract

The high flash point solvent adiponitrile (ADN) was investigated as co-solvent with ethylene carbonate (EC) for use as lithium-ion battery electrolyte. The flash point of this solvent mixture was more than 110 °C higher than that of conventional electrolyte solutions involving volatile linear carbonate components, such as diethyl carbonate (DEC) or dimethyl carbonate (DMC). The electrolyte based on EC:ADN (1:1 wt) with lithium tetrafluoroborate (LiBF4) displayed a conductivity of 2.6 mS cm-1and no aluminum corrosion. In addition, it showed higher anodic stability on a Pt electrode than the standard electrolyte 1 M lithium hexafluorophosphate (LiPF6) in EC:DEC (3:7 wt). Graphite/Li half cells using this electrolyte showed excellent rate capability up to 5C and good cycling stability (more than 98% capacity retention after 50 cycles at 1C). Additionally, the electrolyte was investigated in NCM/Li half cells. The cells were able to reach a capacity of 104 mAh g-1at 5C and capacity retention of more than 97% after 50 cycles. These results show that an electrolyte with a considerably increased flash point with respect to common electrolyte systems comprising linear carbonates, could be realized without any negative effects on the electrochemical performance in Li-half cells. © 2011 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Adiponitrile
  • High flash point electrolyte
  • Lithium-ion battery
  • Safety

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Authors

  • P. Isken

  • C. Dippel

  • R. Schmitz

  • R. W. Schmitz

  • M. Kunze

  • S. Passerini

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