We report a new structure of thin, flexible Li-ion batteries using paper as separators and free-standing carbon nanotube thin films as both current collectors
2010
Key concepts
Scholarcy highlights
- There is a strong interest in thin, flexible energy storage devices to meet modern society needs for applications such as interactive packaging, radio frequency sensing, and consumer products
- It has been reported that CNT thin films have been used as anodes for Li-ion batteries due to their large surface areas, but they show large irreversible capacities and low coulombic efficiencies for the first cycle when cycled below 1 V vs Li/LiĻ©
- Full cells with integrated current collectors and battery electrodes onto a single sheet or paper are fabricated with the same lamination process
- Ajayan et al developed flexible batteries and supercapacitors based on nanocomposite paper in 2007; Mihranyan et al developed ultrafast all-polymer paperbased batteries in 2009; and we explored conductive paper for energy storage recently
- One method for increasing the total energy for the Li-ion paper battery is through stacking layer upon layer, as in Figure 4f, where conductive CNT films function as current collectors, and extended metal strips at the edge serve as connections to the external circuit
- We have demonstrated a Li-ion battery integrated onto a single sheet of paper through a simple lamination process
- Free Standing LTO/CNT Double Layer Films: Aqueous CNT ink was prepared with 10% by weight sodium dodecylbenzenesulfonate as surfactant based on commercial, arc-discharged CNTs www.acsnano.org
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