Critical Contribution of Imbalanced Charge Loss to Performance Deterioration of Si-Based Lithium-Ion Cells During Calendar Aging

Jiyu Cai, Xinwei Zhou, Hoai Nguyen, Gabriel Veith, Yan Qin, Wenquan Lu, Stephen Trask, Marco-Tulio Rodrigues, Yuzi Liu, Wenqian Xu, Maxwell Schulze, Anthony Burrell, Zonghai Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Increasing the energy density of lithium-ion batteries, and thereby reducing costs, is a major target for industry and academic research. One of the best opportunities is to replace the traditional graphite anode with a high-capacity anode material, such as silicon. However, Si-based lithium-ion batteries have been widely reported to suffer from a limited calendar life for automobile applications. Heretofore, there lacks a fundamental understanding of calendar aging for rationally developing mitigation strategies. Both open-circuit voltage and voltage-hold aging protocols were utilized to characterize the aging behavior of Si-based cells. Particularly, a high-precision leakage current measurement was applied to quantitatively measure the rate of parasitic reactions at the electrode/electrolyte interface. The rate of parasitic reactions at the Si anode was found 5 times and 15 times faster than those of LiNi0.8Mn0.1Co0.1O2 and LiFePO4 cathodes, respectively. The imbalanced charge loss from parasitic reactions plays a critical role in exacerbating performance deterioration. In addition, a linear relationship between capacity loss and charge consumption from parasitic reactions provides fundamental support to assess calendar life through voltage-hold tests. These new findings imply that longer calendar life can be achieved by suppressing parasitic reactions at the Si anode to balance charge consumption during calendar aging.

Original languageAmerican English
Pages (from-to)48085-48095
Number of pages11
JournalACS Applied Materials and Interfaces
Volume15
Issue number41
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 UChicago Argonne, LLC, Operator of Argonne National Laboratory. Published by American Chemical Society.

NREL Publication Number

  • NREL/JA-5700-87883

Keywords

  • calendar aging
  • charge balance
  • parasitic reactions
  • Si anode
  • steady leakage current

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