Kalyoncuoglu, Burcu Ozgul, Metin Altundag, Sebahat Altin, Emine Moeez, Iqra Chung, Kyung Yoon Arshad, Muhammad Aydin, Mustafa Goktan Depci, Tolga Altin, Serdar Sahinbay, Sevda 2024-01-19T08:02:43Z 2024-01-19T08:02:43Z 2023-12-28 2023-12 2574-0962 https://pubs.kist.re.kr/handle/201004/113028 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. English AMER CHEMICAL SOC High-Performance Ag-Doped Na0.67MnO2 Cathode: Operando XRD Study and Full-Cell Performance Analysis with Presodiated Anode Article 10.1021/acsaem.3c02134 1 ACS Applied Energy Materials, v.6, no.23, pp.11993 - 12002 ACS Applied Energy Materials 6 23 11993 12002 N scie scopus 001123856000001 2-s2.0-85179170682 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article SODIUM CO SUBSTITUTION PHASE NI TRANSITION COMPOSITE OXIDES OXYGEN MG Na-ion cathode P2 type cathode Na0.67MnO2