Directly fabricated flexible thin film batteries on polymer substrate
Haena Yim, Y E Sung and J W Choi
Korea Institute of Science and Technology, South Korea
Seoul National University, South Korea
: J Nanomater Mol Nanotechnol
Abstract
The advanced wearable electronics such as bio-sensors and chemical-sensors require flexible and lightweight lithium batteries with a great cyclability and high energy density. All-solid-state lithium batteries have received attention in these years because of their safe characteristic and high density. Also, using a polymer substrate for electronics is the current trend due to its disposable, lightweight, and bendable properties. However, the major problem to investigate flexible batteries on the polymer substrate is a crystallization of the cathode thin film at high temperature. Eventually, the polymer substrate decomposed, so a new direction of crystallization should be considered. Here, we present a new fabricating method for all-solid-state LiNi0.5Mn1.5O4/LiPON/Li structure flexible lithium batteries using excimer laser annealing system. Excimer laser annealing can selectively crystallize LiNi0.5Mn1.5O4 cathode thin film in low temperature without thermal damage of substrate. The excimer laser annealed cathode thin films were well crystallized without damage and it could be easily applied large-area by scanning laser. Structural properties of the thin films were investigated by X-ray diffraction (XRD), transmission electron microscope (TEM), and scanning electron microscopy (SEM). The initial capacity of flexible battery on polyimide substrate was 20μAh μm-1 cm-2 at 0.2 C-rate with operating voltage of 4.6 V. Therefore, we expect that these batteries make it possible to be applied as a power source for various types of micro-sensors.
Biography
Email: haenayim@gmail.com
