Phosphorus-Fixed Stable Interfacial Nonflammable Gel Polymer Electrolyte for Safe Flexible Lithium-Ion Batteries,Advanced Functional Materials

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Phosphorus-Fixed Stable Interfacial Nonflammable Gel Polymer Electrolyte for Safe Flexible Lithium-Ion Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-06-22 , DOI: 10.1002/adfm.202203006
Xiaowei Mu ₁ , Xingjun Li ₁ , Can Liao ₁ , Hen Yu ₁ , Yi Jin ₂ , Bin Yu ₁ , Longfei Han ₁ , LeiKan Chen ₃ , Yongchun Kan ₁ , Lei Song ₁ , Yuan Hu ₁

Affiliation

A high content of flame retardant in non-combustible electrolytes leads to deterioration of the electrochemical performance of lithium-ion batteries (LIBs). Besides, fire hazard of most non-flammable electrolytes is studied in coin cell, for which it is impossible to reveal real performance. Thus, the stable interfacial, phosphorus-fixed nonflammable gel polymer electrolyte (GPE) with low content of flame retardant (7.5 wt.%) has been designed by in situ polymerization of tri(acryloyloxyethyl) phosphate and triethylene glycol dimethacrylate in electrolyte. After being heated by fire for >10 s, the GPE is still not ignited. The average capacity attenuation rate of graphite//GPE//Li (0.008%) is much lower than that of the liquid electrolyte (0.039%). Besides, the nonflammable GPE based pouch cell with good flexibility and excellent fire safety is prepared. No fire, no thermal runaway and no electrolyte leakage occur for 1 Ah flexible pouch cell with 100% SOC. The mechanism for high safety of pouch cell has also been revealed. First the amount of combustible pyrolysis products from thermal degradation of GPE is reduced through forming P and F containing char. Second, the combustion of GPE is extinguished through OH free radical quenching effect of flame retardant molecular. This work provides a guideline for designing high-safety LIBs.

中文翻译：

用于安全柔性锂离子电池的磷固定稳定界面不易燃凝胶聚合物电解质

不可燃电解质中高含量的阻燃剂会导致锂离子电池（LIB）的电化学性能下降。此外，纽扣电池研究了大多数不可燃电解质的火灾危险，无法揭示其真实性能。因此，通过在电解液中原位聚合磷酸三（丙烯酰氧基）乙酯和三甘醇二甲基丙烯酸酯，设计了具有低阻燃剂含量（7.5 wt.%）的稳定界面、磷固定的不易燃凝胶聚合物电解质（GPE）。在被火加热>10 s 后，GPE 仍然没有被点燃。石墨//GPE//Li的平均容量衰减率（0.008%）远低于液态电解质（0.039%）。除了，制备了具有良好柔韧性和优异防火安全性的非易燃GPE基软包电池。100% SOC 的 1 Ah 软包电池不会发生火灾、热失控和电解液泄漏。软包电池的高安全性机制也已被揭示。首先，通过形成含 P 和 F 的炭，减少 GPE 热降解产生的可燃热解产物的量。其次，GPE的燃烧是通过阻燃分子的OH自由基猝灭作用而熄灭的。这项工作为设计高安全性 LIB 提供了指导。首先，通过形成含 P 和 F 的炭，减少 GPE 热降解产生的可燃热解产物的量。其次，GPE的燃烧是通过阻燃分子的OH自由基猝灭作用而熄灭的。这项工作为设计高安全性 LIB 提供了指导。首先，通过形成含 P 和 F 的炭，减少 GPE 热降解产生的可燃热解产物的量。其次，GPE的燃烧是通过阻燃分子的OH自由基猝灭作用而熄灭的。这项工作为设计高安全性 LIB 提供了指导。

更新日期：2022-06-22

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