Dielectric capacitors play a key role in high power electronics, electric vehicles, and medical devices. Due to the biodegradability, high thermal stability, and ease of processing, poly(lactic acid)-based (PLA) films are widely used in applications of tissue engineering, actuators, and sensors. In this investigation, PLA films are prepared using a solution casting method for high energy density capacitor applications. It is found that the stretched poly(d-lactic acid) (PDLA) film exhibits an energy density and charge discharge efficiency of 18.5 J cm⁻³ and 95%, respectively, at room temperature. Furthermore, after a heating time of 30 min at 100 °C, it is found that the energy density and chargedischarge efficiency of the stretched PDLA films are maintained at 11.2 J cm⁻³ and 76%, respectively. In comparison, the energy density and efficiency of the stretched PDLA film are 1.03-fold and 53% higher, respectively, than those of the stretched poly(vinylidene fluoride-hexafluoropropylene) film at 100 °C with the same heat treatment. Compared with a high temperature polyimide material, the energy density of the stretched PDLA film is 1.98-fold higher at 100 °C. The PLA-based material shows great promise for application in high energy density capacitors operating at a high temperature (100 °C).

中文翻译：

---

具有优异热稳定性的聚乳酸基薄膜，适用于高能量密度电容器应用

介电电容器在大功率电子产品、电动汽车和医疗设备中发挥着关键作用。由于可生物降解、高热稳定性和易于加工，聚乳酸基 (PLA) 薄膜被广泛用于组织工程、执行器和传感器的应用中。在这项研究中，PLA 薄膜是使用溶液浇铸方法制备的，用于高能量密度电容器应用。发现拉伸的聚（d-乳酸）（PDLA）膜在室温下分别表现出18.5 J cm ^-3和95%的能量密度和充电放电效率。此外，在 100°C 下加热 30 分钟后，发现拉伸的 PDLA 薄膜的能量密度和充放电效率保持在 11.2 J cm^-3和 76%，分别。相比之下，拉伸后的 PDLA 薄膜在 100 °C 下相同热处理的能量密度和效率分别比拉伸的聚（偏二氟乙烯-六氟丙烯）薄膜高 1.03 倍和 53%。与高温聚酰亚胺材料相比，拉伸后的 PDLA 薄膜在 100°C 时的能量密度提高了 1.98 倍。PLA 基材料在高温 (100 °C) 下工作的高能量密度电容器中显示出巨大的应用前景。