Improving Resistance‐Temperature Characteristic of Polyethylene/Carbon Black Composites by Poly(3,4‐Ethylenedioxythiophene)‐Functionalized Multilayer Graphene,Macromolecular Chemistry and Physics

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Improving Resistance‐Temperature Characteristic of Polyethylene/Carbon Black Composites by Poly(3,4‐Ethylenedioxythiophene)‐Functionalized Multilayer Graphene
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-06-28 , DOI: 10.1002/macp.202000144
Guangfa Shi ₁ , Xiaomin Cai ₁ , Wenqiang Wang ₁ , Gengchao Wang ₁

Affiliation

Polymeric positive temperature coefficient (PTC) materials can be used to install “brake” technology for the thermal runaway of lithium‐ion batteries. However, it still has poor cycle stability and obvious negative temperature coefficient (NTC) effect, which reduces the reliability of the material. In order to solve these problems, conductive polymer poly(3,4‐ethylenedioxythiophene) (PEDOT) modified multilayer graphene (MLG) conductive additive (PEDOT‐MLG) is introduced into middle density polyethylene/carbon black (MDPE/CB) system. Compared with the conventional modification, the PEDOT modified MLG shows high conductivity and excellent thermal stability. In addition, the introduction of PEDOT‐MLG into MDPE/CB can further reduce the room temperature resistivity due to the good compatibility between the modified graphene and the matrix, thus improving the PTC intensity to 7.1. What is more, MLG limits the re‐aggregation of CB particles when the temperature further rises, which effectively weakens the NTC effect.

中文翻译：

聚（3,4-乙撑二氧噻吩）-功能化多层石墨烯改善聚乙烯/炭黑复合材料的电阻-温度特性

聚合正温度系数（PTC）材料可用于安装“制动”技术，以使锂离子电池热失控。但是，它仍然具有较差的循环稳定性和明显的负温度系数（NTC）效应，这降低了材料的可靠性。为了解决这些问题，将导电聚合物聚（3,4-乙撑二氧噻吩）（PEDOT）改性的多层石墨烯（MLG）导电添加剂（PEDOT-MLG）引入了中密度聚乙烯/炭黑（MDPE / CB）系统中。与传统的修改相比，PEDOT修改的MLG具有高导电性和出色的热稳定性。此外，由于改性石墨烯与基质之间的良好相容性，将PEDOT-MLG引入MDPE / CB可以进一步降低室温电阻率，从而将PTC强度提高到7.1。而且，当温度进一步升高时，MLG限制了CB颗粒的重新聚集，这有效地削弱了NTC效应。

更新日期：2020-06-28

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