Recent years have witnessed significant advances in all-solid-state lithium batteries (ASSLBs). However, soft breakdown hidden in ASSLBs has been overlooked in most previous research. Moreover, existing assessment criteria are insensitive to detecting soft breakdown. Here, we first discuss the current status of ASSLBs and highlight the challenges of evaluating the soft breakdown phenomenon with the existing evaluation method. A simple but effective strategy—cyclic voltammetry—is then proposed to diagnose soft breakdown in all-solid-state symmetric cells. To establish a standard testing protocol, several critical parameters that have not been well emphasized thus far, including areal capacity, thickness, and porosity of solid electrolytes, are numerically analyzed to understand their significant effect on the energy density of practical all-solid-state pouch cells. With these understandings, we establish a definitive testing benchmark with the aim of guiding the research efforts toward in-depth scientific understanding and practical engineering design.

近年来，全固态锂电池（ASSLB）取得了重大进展。然而，隐藏在 ASSLB 中的软故障在之前的大多数研究中都被忽视了。此外，现有的评估标准对检测软故障不敏感。在这里，我们首先讨论 ASSLBs 的现状，并强调用现有评估方法评估软击穿现象的挑战。然后提出了一种简单但有效的策略——循环伏安法——来诊断全固态对称电池的软击穿。为了建立一个标准的测试协议，迄今为止尚未得到很好强调的几个关键参数，包括固体电解质的面积容量、厚度和孔隙率，进行了数值分析，以了解它们对实际全固态软包电池能量密度的显着影响。有了这些理解，我们建立了一个明确的测试基准，旨在指导研究工作朝着深入的科学理解和实际的工程设计方向发展。