In this paper, a series of silicone rubber (SR)/thermochromic microcapsules (TC@MF)/cuprous oxide (CuO) flexible phase change composites (STC) with multi-colors and reversible thermochromic were prepared. In this composite, SR was used as polymer matrix and TC@MF with phase change enthalpy of 193 J/g was used as functional filler. Moreover, different contents of CuO were introduced to change color of composites and improve thermal conductivity and photothermal conversion. The STC composites could undergo reversible color changes from blue-violet to red with a color change temperature of approximately 52 °C. And it exhibited excellent leakage resistance with the leakage rate of STC-2 as low as 0.41%. The thermal conductivity of the STC-3 composite reached 0.33 W m K at CuO content of 9 phr. The STC composites were applied to dissipate heat from the battery and the maximum surface temperature was only 49.0 °C at 9.8 A discharge rate which represented 24.03 % reduction in surface temperature compared to the bare battery. This work offers an effective route for preparation of battery thermal regulation materials based on thermochromic microcapsules, which has significant potential for application in the field of battery thermal management.

中文翻译：

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具有多种颜色和可逆热致变色的柔性相变复合材料，用于温度指示和电池热管理

本文制备了一系列多颜色、可逆热致变色的硅橡胶（SR）/热致变色微胶囊（TC@MF）/氧化亚铜（CuO）柔性相变复合材料（STC）。该复合材料以SR为聚合物基体，以相变焓为193 J/g的TC@MF为功能填料。此外，引入不同含量的CuO来改变复合材料的颜色并提高导热性和光热转换。STC 复合材料可以经历从蓝紫色到红色的可逆颜色变化，颜色变化温度约为 52 °C。并且表现出优异的耐漏电性能，STC-2的漏电率低至0.41%。当 CuO 含量为 9 phr 时，STC-3 复合材料的导热率达到 0.33 W m K。采用STC复合材料对电池进行散热，在9.8 A放电倍率下，最高表面温度仅为49.0 °C，与裸电池相比，表面温度降低了24.03%。该工作为基于热致变色微胶囊的电池热调节材料的制备提供了一条有效途径，在电池热管理领域具有巨大的应用潜力。