Yaelim Hwang1,2,Ho Won Jang2,Ji-Won Choi1,3
Korea Institute of Science and Technology1,Seoul National University2,KIST-School of the Korea University of Science and Technology (UST)3
Yaelim Hwang1,2,Ho Won Jang2,Ji-Won Choi1,3
Korea Institute of Science and Technology1,Seoul National University2,KIST-School of the Korea University of Science and Technology (UST)3
In recent years, as the development of smart paper, smart windows, medical diagnostic smart lenses, and transparent displays is accelerated, the development of next-generation energy sources with flexibility or transparency is required. The only transparent component used in lithium-ion battery construction is the electrolyte, making it challenging to manufacture transparent batteries. The transparent anode of all-solid-state batteries has not been studied. We have created the transparent cathode LiFePO<sub>4</sub> in previous study. It is a promising candidate for the cathode of a transparent battery due to its wide bandgap of 3.7 eV and great transparency (76.3%). However, since a transparent anode is not present, a full-cell transparent battery has never been created.<br/>In this study, we report the optimized composition of Ag-doped SiN<sub>x</sub> to improve the electrical conductivity of SiN<sub>x</sub>. The effect of Ag doping on electrical conductivity and electrochemical characteristics in transparent SiN<sub>x</sub> anode is investigated using the continuous composition spread (CCS) method. By utilizing two 90° off-axis RF sputtering guns facing each other, the CCS approach allows for the simultaneous study of a large number of compositions. Here, we investigate the optimal transparent SiN<sub>x</sub>-Ag anode composition in terms of their optical absorption spectra, electrical performance and lithium storage capacities. The results come out very clear that doping Ag into SiNx can improve not only the electrical conductivity, but also the performance of the electrochemical system. Ag doped SiN<sub>x</sub> transparent anode is successfully approached to thin film battery and we have optimized SiN<sub>x</sub>-Ag content with high electrochemical properties balanced with the transmittance.