Nickel and manganese on lithium borate glass cathode for energy storage materials

Abstract

In this work, co-doped nickel and manganese ions in lithium-borate-based glass (xNiO-yMnO:0.8LBO) were successfully fabricated with different Ni and Mn ratios and studied their structure and function relationship, especially on electrochemical properties. All fabricated glasses were amorphous phase, observed by XRD and TEM techniques. Optical band gaps ranging from 3.336 to 3.539 eV were found in prepared glass system. The oxidation state of Ni2+ and the mixing of Mn2+/3+ were clearly observed using XPS technique and synchrotron-based XANES technique. Additionally, the Ni and Mn K-edge EXAFS analysis exhibited a co-existence of octahedral site structure (A-site) and tetrahedral site structure (B-site) in all glasses with a different proportional site. By electrochemical studies, the specific capacitances of these glass system significantly increased with increasing Ni contents in glass composition. Interestingly, the highest specific capacitance value of 81.57 F.g–1 was obtained for NM31 (0.15NiO-0.05MnO:0.8LBO) glass sample suggesting a new promising glass electrode in future Li-ion battery.