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Recent studies have highlighted the impressive performance of lithium metal batteries (LMBs), showcasing cell-level energy densities surpassing 350 Wh kg–1. However, the intricate mechanisms leading to cell degradation in these batteries remain elusive, impeding their widespread utilization as energy storage devices. Specifically, the influence of the discharge rate on the deterioration of lithium metal electrodes remains poorly understood. In this study, pouch-type Li|NMC811 cells were fabricated employing a lean electrolyte, and a comprehensive exploration was conducted into the effects of the discharge rate on the battery performance. Intriguingly, our findings illustrate a positive correlation between the increase in discharge rate within the range of 0.4–1.6 mA cm–2 and an improvement in the cycle life of LMBs. In-depth analyses indicate that increasing the discharge current density to 1.6 mA cm–2 effectively suppresses irreversible volume expansion in lithium metal electrodes. Consequently, this suppression in volume expansion is identified as a significant factor contributing to the enhanced cycle life at increased discharge rates. Conversely, when the discharge rate surpasses 1.6 mA cm–2, a detrimental impact on the cycle life is observed due to kinetic limitations experienced by the NMC electrode. These findings elucidate the operational principles governing LMBs, offering insights into achieving both high-power density and extended cycle life.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: lithium metal battery, high-capacity battery, failure analysis , discharge rate, battery diagnosis

刊行年月日: 2024-05-13

出版者: American Chemical Society (ACS)

掲載誌:

• ACS Applied Energy Materials (ISSN: 25740962) vol. 7 issue. 9 p. 3824-3830

研究助成金:

• JPMJPF2016

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acsaem.4c00180

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更新時刻: 2024-06-19 16:30:25 +0900

MDRでの公開時刻: 2024-06-19 16:30:25 +0900