This was previously covered here This translates to an energy
cost of 10-20 watt-hour per US dollar for the membrane, as
compared to just 2.5 watt-hour per US dollar for lithium ion
batteries. This is 4 to 8 times cheaper. The research team, led
by Principal Investigator Dr Xie Xian Ning, used a polystyrene-
based polymer to deposit the soft, foldable membrane converted
from organic waste which, when sandwiched between and charged by
two graphite plates, can store charge at 0.2 farads per square
centimetre. This capability was well above the typical upper
limit of 1 microfarad per square centimetre for a standard
capacitor. The cost involved in energy storage is also
drastically reduced with this invention, from about US$7 to
store each farad using existing technologies based on liquid
electrolytes to about US$0.62 per farad. Dr Xie said: "Compared
to rechargeable batteries and supercapacitors, the proprietary
membrane allows for very simple device configuration and low
fabrication cost. Moreover, the performa