Hybridizing Energy Conversion and Storage in a Mechanical-to-Electrochemical Process for Self-Charging Power Cell

School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332-0245, United States.
Nano Letters (Impact Factor: 13.03). 08/2012; 12(9):5048-54. DOI: 10.1021/nl302879t
Source: PubMed

ABSTRACT Energy generation and energy storage are two distinct processes that are usually accomplished using two separated units designed on the basis of different physical principles, such as piezoelectric nanogenerator and Li-ion battery; the former converts mechanical energy into electricity, and the latter stores electric energy as chemical energy. Here, we introduce a fundamental mechanism that directly hybridizes the two processes into one, in which the mechanical energy is directly converted and simultaneously stored as chemical energy without going through the intermediate step of first converting into electricity. By replacing the polyethylene (PE) separator as for conventional Li battery with a piezoelectric poly(vinylidene fluoride) (PVDF) film, the piezoelectric potential from the PVDF film as created by mechanical straining acts as a charge pump to drive Li ions to migrate from the cathode to the anode accompanying charging reactions at electrodes. This new approach can be applied to fabricating a self-charging power cell (SCPC) for sustainable driving micro/nanosystems and personal electronics.

  • [Show abstract] [Hide abstract]
    ABSTRACT: The properties of piezoelectric PVDF films as separators are studied in NiO/Li electrodes Li-ion power cell. The results show that the PVDF piezoelectric film with excellent insulation is suitable for the environmental energy harvesting application. This is attributable to the compact structure of the piezoelectric PVDF film, and which make it has low leakage current and low charge-discharge current characteristics.
    Science China Technological Sciences 11/2013; 56(11):2646-2648. DOI:10.1007/s11431-013-5367-2 · 1.11 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The nanocomposites of SnO2-CuO/graphene are synthesized via a two-step method. CuO nanorods are firstly uniformly loaded on the graphene nanosheets, and then SnO2 nanoparticles are coated on CuO nanorods. SnO2-CuO/graphene nanocomposites exhibit high cyclability and capacity as anode of Li-ion battery. After 30 cycles, the capacity can maintain at 584 mAh g−1 at 0.1C rate (10 h per half cycle). The high performance can be ascribed to the synergistic effect among SnO2 nanoparticles, CuO nanorods and graphene nanosheets. The results manifest that the nanocomposites of SnO2-CuO/graphene are very suitable for Li-ion battery anodes.
    Science China Technological Sciences 06/2014; 57(6):1081-1084. DOI:10.1007/s11431-014-5507-3 · 1.11 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Self-powered chaos signal generator is potentially useful in future medical system, such as low cost portable human healthy monitor and treatment without external power source. For both functional and power unit, the power level of electric energy generator and consumption is a key factor for self-powered system. In this paper, we have investigated the power consumption of three typical output modes of a simple chaos circuit. Analytical analysis for power consumption of fixed output mode is obtained for evaluating the power characteristics of chaos signal generator. Numerical calculations are given for predicting the power characteristics of periodical and chaotic output modes. This study is important for not only understanding the power consumption of chaos signal generator, but also guiding new self-powered chaos signal generator design.
    Science China Technological Sciences 06/2014; 57(6):1063-1067. DOI:10.1007/s11431-014-5544-y · 1.11 Impact Factor