Safety problems hinder the large-scale application of high-specific energy battery system. In this paper, a type of temperature thermo-responsive microcapsules to enhance the safety performance of lithium-ion batteries is proposed. The microcapsule is manufactured by encapsulating hydrates with melamine urea formaldehyde, and the outer shell will automatically rupture and release hydrates at ∼100 °C. It can react with the anode in advance and block reaction between the anode and the electrolyte, thereby reducing the generation of reductive gas and lowering down gas crosstalk. The thermos-responsive microcapsules are prepared by in situ polymerization, and the addition of the microcapsules could effectively reduce the reaction enthalpy by differential scanning calorimetry. Through a adiabatic accelerated calorimetry test, only 0.25 g microcapsules can increase the thermal runaway trigger temperature by 16.2 °C and reduce the maximum temperature by 117.5 °C. This innovative approach enhances the safety of high specific energy lithium-ion battery systems, providing extended thermal-runaway warning time and minimizing the hazard caused by high temperatures.

中文翻译：

---

温度响应型微胶囊减轻锂离子电池热失控危害


安全问题阻碍了高比能电池系统的大规模应用。本文提出了一种温度热响应微胶囊来增强锂离子电池的安全性能。该微胶囊由三聚氰胺脲甲醛封装水合物制成，外壳在~100℃时会自动破裂并释放水合物。它可以提前与阳极反应，阻断阳极与电解液的反应，从而减少还原性气体的产生，降低气体串扰。采用原位聚合法制备了热响应性微胶囊，差示扫描量热法表明微胶囊的添加可以有效降低反应热函。通过绝热加速量热测试，仅0.25 g微胶囊即可将热失控触发温度提高16.2℃，最高温度降低117.5℃。这种创新方法增强了高比能锂离子电池系统的安全性，提供更长的热失控警告时间并最大限度地减少高温造成的危险。