Capacity degradation of lithium rechargeable batteries
نویسندگان
چکیده
Li rechargeable cells made with structural arrangement Li/membrane/LixV2O5 were examined under different charge states using ac impedance, environmental scanning electron microscope (ESEM), transmission electron microscope (TEM) and the high-resolution nuclear magnetic resonance (NMR). These states include charged, discharged, and over cycled. The lowest internal resistance was obtained from the cell at charged state; the resistance increased when the cell was discharged; and the highest resistance was obtained from the cell at over-cycled state. From the ESEM and TEM studies, it was found that the surface of cathode electrode was porous initially; however, it was coated with an amorphous film and porous features had also disappeared from the cell at over cycled state. In addition, higher concentration of aluminum w l d ©
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تاریخ انتشار 2005