Fast formation cycling for lithium ion batteries

Seong Jin An, Jianlin Li, Zhijia Du, Claus Daniel, David L. Wood

Research output: Contribution to journalArticlepeer-review

146 Scopus citations

Abstract

The formation process for lithium ion batteries typically takes several days or more, and it is necessary for providing a stable solid electrolyte interphase on the anode (at low potentials vs. Li/Li+) for preventing irreversible consumption of electrolyte and lithium ions. An analogous layer known as the cathode electrolyte interphase layer forms at the cathode at high potentials vs. Li/Li+. However, several days, or even up to a week, of these processes result in either lower LIB production rates or a prohibitively large size of charging-discharging equipment and space (i.e. excessive capital cost). In this study, a fast and effective electrolyte interphase formation protocol is proposed and compared with an Oak Ridge National Laboratory baseline protocol. Graphite, NMC 532, and 1.2 M LiPF6in ethylene carbonate: diethyl carbonate were used as anodes, cathodes, and electrolytes, respectively. Results from electrochemical impedance spectroscopy show the new protocol reduced surface film (electrolyte interphase) resistances, and 1300 aging cycles show an improvement in capacity retention.

Original languageEnglish
Pages (from-to)846-852
Number of pages7
JournalJournal of Power Sources
Volume342
DOIs
StatePublished - 2017

Keywords

  • Cycle life
  • Fast formation
  • Full pouch-cell
  • Lithium-ion battery
  • Resistance
  • Solid electrolyte interphase

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