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Building a Thermal Shutdown Cathode for Li‐Ion Batteries Using Temperature‐Responsive Poly(3‐Dodecylthiophene)
Energy Technology ( IF 3.6 ) Pub Date : 2020-05-28 , DOI: 10.1002/ente.202000365 Hui Li 1 , Xinnuo Zhang 1 , Chongrong Zhang 1 , Yuliang Cao 1 , Hanxi Yang 1 , Xinping Ai 1 , Faping Zhong 2
Energy Technology ( IF 3.6 ) Pub Date : 2020-05-28 , DOI: 10.1002/ente.202000365 Hui Li 1 , Xinnuo Zhang 1 , Chongrong Zhang 1 , Yuliang Cao 1 , Hanxi Yang 1 , Xinping Ai 1 , Faping Zhong 2
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Thermal shutdown electrodes can provide a safety control for lithium‐ion batteries (LIBs) under a wide range of applications. However, developing such an electrode is difficult due to the lack of electrochemically compatible materials with suitable temperature‐responsive functions. Herein, a new thermal‐responsive conductive polymer—poly(3‐dodecylthiophene) (P3DDT)—is reported, and this polymer is used as a coating layer of electrode substrate to fabricate a thermal shutdown cathode of Al/P3DDT/LiCoO2 (LCO‐P3DDT). Benefited by the high room‐temperature conductivity, strong positive‐temperature‐coefficient (PTC) effect, and appropriate transition temperature of the P3DDT layer, the LCO‐P3DDT cathode not only exhibits similar electrochemical performance as a conventional LCO cathode at normal operating temperatures, but also plays a desired shutdown function to switch off the electrode reaction at elevated temperatures of ≥90 °C, thus protecting the cell from thermal runaway. This PTC effect of p‐doped P3DDT is found to be given rise by the thermal de‐doping of anions from the doped P3DDT skeleton at elevated temperature. This temperature‐responsive mechanism may provide a new insight for designing better thermal shutdown electrodes for a wide variety of battery applications.
中文翻译：
使用温度响应性聚（3-十二烷基噻吩）为锂离子电池构建热关断阴极
热关断电极可以在广泛的应用范围内为锂离子电池（LIB）提供安全控制。但是，由于缺乏具有合适的温度响应功能的电化学兼容材料，因此很难开发这种电极。本文报道了一种新型的热响应型导电聚合物聚（3-十二烷基噻吩）（P3DDT），该聚合物被用作电极基板的涂层以制造Al / P3DDT / LiCoO 2的热关断阴极（LCO-P3DDT）。得益于较高的室温电导率，强大的正温度系数（PTC）效应以及适当的P3DDT层转变温度，LCO-P3DDT阴极不仅在正常工作温度下具有与常规LCO阴极相似的电化学性能，而且还具有所需的关机功能，可在≥90°C的高温下关闭电极反应，从而保护电池免受热失控。发现通过在高温下从掺杂的P3DDT骨架中对阴离子进行热去掺杂，可以增强p掺杂的P3DDT的PTC效应。这种温度响应机制可能为为各种电池应用设计更好的热关断电极提供新的见解。
更新日期：2020-07-02
中文翻译：
使用温度响应性聚（3-十二烷基噻吩）为锂离子电池构建热关断阴极
热关断电极可以在广泛的应用范围内为锂离子电池（LIB）提供安全控制。但是，由于缺乏具有合适的温度响应功能的电化学兼容材料，因此很难开发这种电极。本文报道了一种新型的热响应型导电聚合物聚（3-十二烷基噻吩）（P3DDT），该聚合物被用作电极基板的涂层以制造Al / P3DDT / LiCoO 2的热关断阴极（LCO-P3DDT）。得益于较高的室温电导率，强大的正温度系数（PTC）效应以及适当的P3DDT层转变温度，LCO-P3DDT阴极不仅在正常工作温度下具有与常规LCO阴极相似的电化学性能，而且还具有所需的关机功能，可在≥90°C的高温下关闭电极反应，从而保护电池免受热失控。发现通过在高温下从掺杂的P3DDT骨架中对阴离子进行热去掺杂，可以增强p掺杂的P3DDT的PTC效应。这种温度响应机制可能为为各种电池应用设计更好的热关断电极提供新的见解。
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