Abstract
AbstractDielectric 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).
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