Coupling an electrochemical energy storage system with tribo-electric nanogenerators as self-charging power cells has attracted attention in the area of low-cost and sustainable energy technology research. This review discusses the advancement of self-charging power cells conforming to different energy storage systems and presents solutions to the main challenges, including building a DC-based triboelectric energy harvesting system, applying a high-efficiency power management circuit, developing low self-discharge current, proposing structure-and-performance-matching design, and exploring frontier application scenarios. This review highlights the significance of self-charging power cell technology and provides a guideline for future development and application of self-charging energy storage systems.
Coupling an electrochemical energy storage system (EES) to tribo-electric nanogenerators (TENGs) as the self-charging power cell (SCPC) enables critical enhancement in energy conversion and utili-zation, therefore attracting excitement in the area of low-cost and sustainable energy technology research. Rather than discussing TENG metrics, this review describes the advancement of SCPCs conforming to different EESs, including supercapacitor (SC), metal-ion battery (MIB), and metal-air battery (MAB). In view of the main challenges of SCPCs, solutions regarding (1) building a direct current (DC)-based triboelectric energy harvesting system, (2) applying a high-efficiency and commercial power management circuit (PMC), (3) developing low self-discharge current and new energy storage systems, (4) proposing ingenious structure-and per-formance-matching design, and (5) exploring frontier application scenarios are presented in detail, with the expectation of highlighting the significance of SCPC technology in power source -free circumstances and providing a forward-looking guideline for the future development and application of self-charging energy storage systems.
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