Yinda Li

1. Introduction A DC link capacitor (DCLC) uses metallized films (MFs) with self-healing properties as a dielectric [1,2]. DCLCs have advantages in terms of withstanding high-temperature and their voltage, large ripple current, and lifespan [3,4]. DCLCs play a role in voltage equalization, energy storage and filtering in converters [5]. Currently, DCLCs are widely used in power transmission, clean energy and electric locomotives [6,7].

1 Introduction Sodium ion batteries are considered as the next generation electrochemical devices for large-scale energy storage because of low cost, abundant resources, environmental friendliness, and high safety.[1-5] The performance of the cathode materials plays a key role in realizing a stable and high-efficiency energy storage.

1. Introduction Metalized polypropylene film capacitors (MPFCs) are commonly regarded as specific capacitors fabricated based on biaxially oriented polypropylene (BOPP) film with a vapor-deposited metal layer as the dielectric. MPFCs are advantageous for their high temperatures, high voltages, large ripple currents, and long lifetimes [1,2]. Dry DC link capacitors (DCLCs) employ metalized polypropylene films (MPFs) as the dielectric, which possess self-healing properties [3].