title: 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-Li4Ti5O12battery. 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.
authors: Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Science Beijing 100083 P.R. China.
authors: Xiong
authors: X
authors: Pu
authors: Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Science Beijing 100083 P.R. China.
authors: Mengmeng
authors: M
authors: Liu
authors: Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Science Beijing 100083 P.R. China.
authors: Linxuan
authors: L
authors: Li
authors: Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Science Beijing 100083 P.R. China.
authors: Chi
authors: C
authors: Zhang
authors: Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Science Beijing 100083 P.R. China.
authors: Yaokun
authors: Y
authors: Pang
authors: Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Science Beijing 100083 P.R. China.
authors: Chunyan
authors: C
authors: Jiang
authors: Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Science Beijing 100083 P.R. China.
authors: Lihua
authors: L
authors: Shao
authors: Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Science Beijing 100083 P.R. China.
authors: Weiguo
authors: W
authors: Hu
authors: School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332-0245 USA.
authors: Zhong Lin
authors: ZL
authors: Wang
keywords: Li‐ion battery; impedance match; power utilization efficiency; pulsed current; triboelectric nanogenerator