According to one of the comments on the CNN article "She made a new battery made out of capacitors that can charge in 20 sec. This CNN article is misleading." so your title is now misleading too
In her project summary, Khare has clearly mentioned her objectives, methods and results.
Her goal was to design and synthesise a super capacitor with increased energy density while maintaining power density and long cycle life.
She designed, synthesised and characterised a novel core-shell nanorod electrode with hydrogemated TiO2(H-TiO2) core and polyaniline shell. H-TiO2 acts as the double layer electrostatic core.
Good conductivity of H-TiO2 combined with the high pseudo capacitance of polyaniline results in significantly higher overall capacitance and energy density while retaining good power density and cycle life.
This new electrode was fabricated into a flexible solid-state device to light an LED to test it in a practical application.
Khare then evaluated the structural and electrochemical properties of the new electrode. It demonstrated high capacitance of 203.3 mF/cm2 (238.5 F/g) compared to the next best alternative super capacitor in previous research of 80 F/g, due to the design of the core-shell structure.
This resulted in excellent energy density of 20.1 Wh/kg, comparable to batteries, while maintaining a high power density of 20540 W/kg. It also demonstrated a much higher cycle life compared to batteries, with a low 32.5% capacitance loss over 10,000 cycles at a high scan rate of 200 mV/s.
Therefore, she successfully managed to introduce this new energy device to replace conventional batteries in flexible electronic devices.