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

Abstract

Apparent critical current density (jAca) 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 jAca is proposed for the first time. With garnet-based plane-surface structure ASSLSCs as an exemplification, the jAca is quite small when the capacity is dramatically large. Under a perturbed capacity of 0.001 mA h cm−2, the jAca is determined to be as high as 2.35 mA cm−2 at room temperature. This investigation demonstrates that the capacity perturbation strategy is a feasible strategy for measuring the possible maximum jAca of Li/ solid electrolyte interface, and hopefully provides good references to explore the critical current density of other types of electrochemical systems.