Improving the Long-Term Cycle Performance of xLi2MnO3 (1-x)LiMeO2/Li4Ti5O12 Cells via Prelithiation and Electrolyte Engineering

Yicheng Zhang, Glenn Teeter, Young Jin Kim, Kyusung Park, Anthony Burrell, Yeyoung Ha

Research output: Contribution to journalArticlepeer-review

Abstract

Toward the development of high energy density and long lifetime batteries for behind-the-meter storage (BTMS) applications, Li- and Mn-rich layered oxide cathode (xLi2MnO3·(1-x)LiMeO2, Me = Ni, Mn, and etc., LMR-NM) and Li4Ti5O12 (LTO) anode system was examined. To mitigate the major degradation mechanisms at each electrode (i.e., loss of Li inventory (LLI) at the anode and transition metal dissolution and oxygen release at the cathode), two approaches were taken—prelithiating the LTO electrode and varying the electrolyte solvent compositions. The effect of prelithiation and electrolyte engineering on the long-term cycle performance of LMR-NM/LTO cells were systematically evaluated via electrochemical analyses and post-mortem characterizations. By using a prelithiated LTO anode and supplying additional Li to the system, the capacity retention of LMR-NM/LTO system was improved. The degree of enhancement was dependent on the types of electrolytes used, as their decomposition products determined the level of LLI. With increased capacity retention, however, the cathode was utilized to a greater extent, resulting in more severe loss of the cathode active material. Thus, all degradation mechanisms should be considered comprehensively when designing high performance LMR-NM/LTO cells to account for their complex interplay.

Original languageAmerican English
Article number090521
Number of pages10
JournalJournal of the Electrochemical Society
Volume170
Issue number9
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.

NREL Publication Number

  • NREL/JA-5K00-85215

Keywords

  • behind-the-meter storage (BTMS)
  • carbonate electrolytes
  • Li- and Mn-rich layered oxides
  • Li-ion batteries
  • LiTiO (LTO)
  • prelithiation

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