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Danshuo Chen,Yajing Li,Xiaochen Zhang,Sujuan Hu,Yingjian Yu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
Compared with metal-air batteries, Si-air batteries have advantages on gravimetric/volumetric capacityand safety. This novel battery using flat Si wafer as anode has been preliminarily researched in recent tenyears. In this work, Si nanowires (NWs) have been fabricated on p < 100 > and n < 100 > Si wafers andtheir discharging behaviors under various operating conditions have been systematically analyzed comparedwith flat Si wafer anodes. Si NWs anodes universally exhibit longer discharge times than flat Siwafer anodes because of their larger specific surface areas and superior resistance to the passivationcaused by SiO2 deposition. It is also demonstrated that a KOH electrolyte concentration of 1.9 M is thelowest threshold for the p < 100 > Si anode at a current density of 0.03 mA/cm2, and the p < 100 > Si anodecan discharge for more than 400 h. Furthermore, n < 100 > Si NWs anodes performed best with a dischargetime of more than 500 h at higher current density of 0.05 mA/cm2 with an electrolyte concentrationof 6 M. This work can aid in understanding the electrochemical properties of silicon anodes withdifferent configurations and doping types in Si-air batteries and provide direction for the operation ofSi-air batteries at appropriate conditions.