放热反应
锂(药物)
热失控
石墨
更安全的
阶段(地层学)
材料科学
热的
化学
离子
化学工程
有机化学
医学
热力学
工程类
精神科
计算机科学
物理
电池(电)
复合材料
计算机安全
古生物学
功率(物理)
生物
量子力学
作者
Yuanke Wu,Ziqi Zeng,Sheng Lei,Mengchuang Liu,Wei Zhong,Mingsheng Qin,Shijie Cheng,Jun Xie
标识
DOI:10.1002/ange.202217774
摘要
Abstract The self‐exothermic in early stage of thermal runaway (TR) is blasting‐fuse for Li‐ion battery safety issues. The exothermic reaction between lithiated graphite (LiC x ) and electrolyte accounts for onset of this behavior. However, preventing the deleterious reaction still encounters hurdles. Here, we manage to inhibit this reaction by passivating LiC x in real time via targeted repair of SEI. It is shown that 1,3,5‐trimethyl‐1,3,5‐tris(3,3,3‐trifluoropropyl)cyclotrisiloxane (D 3 F) can be triggered by LiC x to undergo ring‐opening polymerization at elevated temperature, so as to targeted repair of fractured SEI. Due to the high thermal stability of polymerized D 3 F, exothermic reaction between LiC x and electrolyte is inhibited. As a result, the self‐exothermic and TR trigger temperatures of pouch cell are increased from 159.6 and 194.2 °C to 300.5 and 329.7 °C. This work opens up a new avenue for designing functional additives to block initial exothermal reaction and inhibit TR in early stage.
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