Journal of Energy Chemistry ›› 2023, Vol. 79 ›› Issue (4): 56-63.DOI: 10.1016/j.jechem.2022.12.047

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Revealing the potential of apparent critical current density of Li/garnet interface with capacity perturbation strategy

Zhihao Guoa, Xinhai Lia,b,c, Zhixing Wanga,b,c, Huajun Guoa,b,c, Wenjie Penga, Guangchao Lia, Guochun Yana,b,c, Qihou Lia,*, Jiexi Wanga,b,c,*   

  1. aSchool of Metallurgy and Environment, Central South University, Changsha 410083, Hunan, China;
    bEngineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha 410083, Hunan, China;
    cKey Laboratory of Value-added Metallurgy of Hunan Province, Central South University, Changsha 410083, Hunan, China
  • Received:2022-11-03 Revised:2022-12-27 Accepted:2022-12-29 Online:2023-04-15 Published:2023-05-30
  • Contact: * E-mail addresses: liqihou@csu.edu.cn (Q. Li), wangjiexikeen@csu.edu.cn (J. Wang).

Abstract: Apparent critical current density (jaAC) of garnet all-solid-state lithium metal symmetric cells (ASSLSCs) is a fundamental parameter for designing all-solid-state lithium metal batteries. Nevertheless, how much the possible maximum apparent current density that a given ASSLSC system can endure and how to reveal this potential still require study. Herein, a capacity perturbation strategy aiming to better measure the possible maximum jaAC is proposed for the first time. With garnet-based plane-surface structure ASSLSCs as an exemplification, the jaAC is quite small when the capacity is dramatically large. Under a per-turbed capacity of 0.001 mA h cm-2, the jaAC is determined to be as high as 2.35 mA cm-2 at room tem-perature. This investigation demonstrates that the capacity perturbation strategy is a feasible strategy for measuring the possible maximum jaAC of Li/ solid electrolyte interface, and hopefully provides good refer-ences to explore the critical current density of other types of electrochemical systems.

Key words: All-solid-state lithium batteries, Li/solid electrolyte interface, Apparent critical current density, Interfacial state variation, Capacity perturbation strategy