热失控
材料科学
金属锂
阳极
分离器(采油)
电解质
锂(药物)
阴极
热的
放热反应
化学工程
电池(电)
电极
热力学
物理化学
有机化学
内分泌学
功率(物理)
工程类
化学
物理
医学
作者
Xiaohu Zhang,Lang Huang,Bin Xie,Shenghang Zhang,Zhaoxuan Jiang,Gaojie Xu,Jiedong Li,Guanglei Cui
标识
DOI:10.1002/aenm.202203648
摘要
Abstract Anode‐free lithium metal batteries (AFLMBs) are the subject of increasing attention due to their ultrahigh energy density, simplified structure, reduced cost, and relatively high safety, but their thermal runaway performance under abuse conditions has been rarely explored, and a clear understanding of whether the absence of a highly‐reactive lithium metal anode is equal to thermal runaway free remains elusive. Herein, by systematically examining the thermal runaway characteristics of a 2.0 Ah AFLMB, it is revealed that under elevated temperatures, discharged anode‐free pouch cell is safe while the fully‐charged one indeed undergoes thermal runaway, but with a milder intensity than that of a lithium metal battery with the same capacity. Moreover, mechanistic investigations demonstrate that thermal runaway of an AFLMB employing a conventional electrolyte is triggered and dominated by anode‐induced exothermic interactions and the broken separator induced electrodes interaction. Moreover, it is shown for the first time that adding fluoroethylene carbonate in an electrolyte leads to ring‐opening repolymerization at 170 °C to form a thermal‐stable solid layer between anode and cathode, which inhibits the direct contact of electrodes and effectively postpones violent self‐heating. This comprehensive exploration of thermal runaway characteristics and mechanisms of large format AFLMBs sheds fresh light on developing high energy density and safety‐enhanced lithium metal batteries.
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