Improvement of low-temperature performance by adopting polydimethylsiloxane-g-polyacrylate and lithium-modified silica nanosalt as electrolyte additives in lithium-ion batteries

Jung Ha Won, Hae Soo Lee, Louis Hamenu, Mohammed Latifatu, Yong Min Lee, Kwang Man Kim, Jemyung Oh, Won Il Cho, Jang Myoun Ko

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

In this work, poly[dimethylsiloxane-co-(siloxane-g-acrylate)] (PDMS-A) and lithium-modified silica nanosalt (Li202) are used together as low-temperature electrolyte additives in lithium-ion batteries (LIBs), taking advantage of the electrochemical and interfacial stabilities due to their surface functional groups. Using these additives together improves the electrochemical stability and ionic conductivity of liquid electrolyte solution to over 5.5 V and 4 × 10-4 S cm-1 at -20 °C, respectively. The room-temperature electrochemical performance of a conventional LIB (LiCoO2/graphite) is improved by the addition (e.g., initial discharge capacity of 95.9 mAh g-1 obtained after charging at 1.0 C-rate and consequent discharging at 5.0 C-rate). The low-temperature performance is also enhanced, achieving a capacity retention ratio of 63.4% after 50 cycles at -20 °C, compared to 38.7% without the additives. It is also notable that the PDMS unit commonly existing in both additives may be the main cause of the synergistic effects on the electrochemical performance due to the compatibility between PDMS-A and Li202.

Original languageEnglish
Pages (from-to)325-329
Number of pages5
JournalJournal of Industrial and Engineering Chemistry
Volume37
DOIs
Publication statusPublished - 25 May 2016
Externally publishedYes

Keywords

  • Electrolyte additives
  • Lithium-ion battery
  • Lithium-silica nanosalt
  • Low-temperature performance
  • Polydimethylsiloxane additive

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