Efficient Charging of Li-Ion Batteries with Pulsed Output Current of Triboelectric Nanogenerators.

ABSTRACT: The triboelectric nanogenerator (TENG) is a promising mechanical energy harvesting technology, but its pulsed output and the instability of input energy sources make associated energy-storage devices necessary for real applications. In this work, feasible and efficient charging of Li-ion batteries by a rotating TENG with pulsed output current is demonstrated. In-depth discussions are made on how to maximize the power-storage efficiency by achieving an impedance match between the TENG and a battery with appropriate design of transformers. With a transformer coil ratio of 36.7, ≈72.4% of the power generated by the TENG at 250 rpm can be stored in an LiFePO₄-Li₄Ti₅O₁₂ battery. Moreover, a 1 h charging of an LiCoO₂-C battery by the TENG at 600 rpm delivers a discharge capacity of 130 mAh, capable of powering many smart electronics. Considering the readily scale-up capability of the TENG, promising applications in personal electronics can be anticipated in the near future.

SUBMITTER: Pu X 

PROVIDER: S-EPMC5054865 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature