Details

Autor(en) / Beteiligte

• Kalyoncuoglu, Burcu
• Ozgul, Metin
• Altundag, Sebahat
• Altin, Emine
• Moeez, Iqra
• Chung, Kyung Yoon
• Arshad, Muhammad
• Aydin, Mustafa Goktan
• Depci, Tolga
• Altin, Serdar
• Sahinbay, Sevda

Titel

High-Performance Ag-Doped Na0.67MnO2 Cathode: Operando XRD Study and Full-Cell Performance Analysis with Presodiated Anode

Ist Teil von

• ACS applied energy materials, 2023-12, Vol.6 (23), p.11993-12002

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The key challenges of Na-ion batteries are to design structurally stable electrodes and reach high-enough capacities with full-cells. In this study, we report the positive effects of Ag substitution/addition to Na0.67MnO2. We determined that some of the intended Ag was incorporated into the structure, while the rest remained in metallic form. Ag substitution/addition increases the capacity (208 mA h/g at C/3 rate) and improves the cycle life of Na0.67MnO2 (42% capacity fade with 100 cycles) in half-cells. We attribute these results to an enlarged interlayer spacing due to the large ionic radius of Ag, a suppressed Jahn–Teller effect due to the reduced number of Mn3+ ions, and an increased electrical conductivity due to the presence of metallic Ag. We also produced full-cells with an electrochemically presodiated hard carbon anode. We reached a very high initial capacity of 190 mA h/g at the C/3 rate, showing that Ag substituted/added Na0.67MnO2 is a promising candidate for commercialization of Na-ion batteries.