Bhange, Deu S. Ali, Ghulam Kim, Dong-Hyun Anang, Daniel A. Shin, Tae Joo Kim, Min-Gyu Kang, Yong-Mook Chung, Kyung Yoon Nam, Kyung-Wan 2024-01-20T02:31:11Z 2024-01-20T02:31:11Z 2021-09-04 2017-01-21 2050-7488 https://pubs.kist.re.kr/handle/201004/123182 The need to find sodium ion battery (SIB) cathodes with high voltage, capacity and improved cycle life has stimulated research on sodium containing layered transition metal oxides. With this perspective, the electrochemical properties of highly ordered, honeycomb layered Na3Ni2BiO6 with a monoclinic superstructure are explored as a cathode material in SIBs. It has been demonstrated that Na3Ni2BiO6 delivers a discharge capacity of 106 mA h g(-1), having high voltage plateaus at 3.50 and 3.25 V, with marginal capacity fading after 50 cycles. Operando X-ray diffraction studies during charging/discharging reveal two reversible two-phase transition mechanisms (initial O3 phase -> P3 intermediate phase -> O1 final phase) during sodium extraction. Ex situ X-ray absorption spectroscopy reveals the charge compensation mechanism for the reversible Ni3+/Ni2+ as an active redox couple while Bi5+ being inactive during cycling. Extended X-ray absorption fine structure analysis shows highly reversible local structural changes around both Ni and Bi atoms occurring during electrochemical cycling. In addition, unique local structure changes especially around Ni atoms due to the honeycomb ordering and size mismatch between Ni2+ and Bi5+ ions are revealed by EXAFS analysis during charging and discharging, which is quite different from the local structure changes in regular layer structured NaMO2 (M = transition metals) cathode materials. The present results suggest that honeycomb layered metal oxides with the general formula, Na3M((II)) M-2(V) O-6, can be considered as candidates for high voltage and long life cathode materials for SIBs. English ROYAL SOC CHEMISTRY MAGNETIC-PROPERTIES ION CHEMISTRY P2-TYPE Honeycomb-layer structured Na3Ni2BiO6 as a high voltage and long life cathode material for sodiumion batteries Article 10.1039/c6ta08661f 1 JOURNAL OF MATERIALS CHEMISTRY A, v.5, no.3, pp.1300 - 1310 JOURNAL OF MATERIALS CHEMISTRY A 5 3 1300 1310 scie scopus 000394430800050 2-s2.0-85010282429 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article MAGNETIC-PROPERTIES ION CHEMISTRY P2-TYPE Na3Ni2BiO6 high voltage long life cathode sodium-ion batteries Honeycomb-layer structured