Thermally conductive separator with hierarchical nano/microstructures for improving thermal management of batteries
Thermally conductive separator with hierarchical nano/microstructures for improving thermal management of batteries
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DOI：
10.1016/j.nanoen.2016.01.026
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发表时间：
2016-04-01
期刊：
影响因子：
17.6
通讯作者：
Chen, Gang
中科院分区：
文献类型：
--
作者：
Yang, Yuan;Huang, Xiaopeng;Chen, Gang
热管理对于提高电池性能和抑制热失控至关重要。除了开发外部冷却技术外，了解和控制电池内部的热传输也很重要。本文首先分析了电池内部的传热，并测量了电池各部件的导热系数。结果表明，低导热系数的隔膜是一个主要的障碍，在锂离子电池的传热。为了提高隔板的热导率，制备了具有类似于1 W m（-1）K-1的热导率的分级纳米/微米-Al 2 O3/聚合物隔板，与商业聚乙烯基隔板相比提高了5倍。已进行建模，以了解背后的热导率的增强机制，这表明，添加纳米粒子显着减少微米级的Al 2 O3颗粒上的聚合物涂层的厚度，从而增加复合隔板的热导率。这种基于Al 2 O3的隔板也具有与商业聚合物隔板类似的离子电导率。这种复合隔膜在开发具有更好性能和安全性的电池中具有潜在的应用。(C)2016爱思唯尔有限公司版权所有
Thermal management is critical to improving battery performance and suppressing thermal runaway. Besides developing external cooling technologies, it is important to understand and control thermal transport inside batteries. In this paper, heat transfer inside batteries is first analyzed and the thermal conductivity of each component is measured. The results show that low thermal conductivity of the separator is one major barrier for heat transfer in Li-ion batteries. To improve thermal conductivity of the separator, a hierarchical nano/micro-Al2O3/polymer separator is prepared with thermal conductivity of similar to 1 W m(-1) K-1, representing an enhancement of 5 x compared to commercial polyethylene-based separators. Modeling has been performed to understand mechanism behind the enhancement of thermal conductivity, which suggests that addition of nanoparticles significantly reduces thickness of polymer coating on micron-sized Al2O3 particles and thus increase the thermal conductivity of the composite separator. This Al2O3-based separator also has similar ionic conductivity with commercial polymer separators. Such composite separator may have potential applications in developing batteries with better performance and safety. (C) 2016 Elsevier Ltd. All rights reserved.