Ku, Bonyoung Ahn, Hobin Lee, Seokjin Ahn, Jinho Choi, Myeongeun Kang, Jungmin Park, Hyunyoung Kim, Junseong Kim, A-Yeon Jung, Hun-Gi Yoo, Jung- Keun Kim, Jongsoon 2024-01-19T08:33:32Z 2024-01-19T08:33:32Z 2023-10-29 2023-09 2405-8297 https://pubs.kist.re.kr/handle/201004/113280 Sluggish kinetics and structural instability caused by oxygen redox can lead to poor electrochemical performance of cathode materials, resulting in a much lower operating voltage during discharging than charging (especially at high current densities) and poor power-capability. Additionally, undesirable phase transitions during charge/ discharge negatively affect the electrochemical performance of oxygen-redox-based P2-type Mn-based layered oxide cathodes. In this study, we demonstrate the successful stabilization of oxygen redox in P2-type Mn-based layered oxide cathodes through the synergy of Cu-Co. Particularly, the discharge operation voltage and energy density during fast charging are significantly enhanced. The average discharge voltage difference of P2-type Na0.67[Cu0.2Co0.2Mn0.6]O2 between 10 and 1000 mA g-1 is approximately-0.18 V, respectively, which is distinctly different from the case of P2-type Na0.67[Cu0.2Mn0.8]O2 showing differences of approximately-0.36 V under the same conditions. Moreover, after 100 cycles, the discharge capacity of P2-type Na0.67[Cu0.2Co0.2Mn0.6] O2 with oxygen redox is retained to-93% of the initial capacity, due to both a small volume change during charge/discharge (-0.6%) and successful suppression of undesirable phase transition of P2-OP4. The outcomes of this study underscore the viability of employing oxygen-redox-based P2-type Na-layered oxide as a reasonable method for achieving exceptional high-rate and high-voltage performance. English Elsevier BV Stable high-voltage operation of oxygen redox in P2-type Na-layered oxide cathode at fast discharging via enhanced kinetics Article 10.1016/j.ensm.2023.102952 1 Energy Storage Materials, v.62 Energy Storage Materials 62 N scie scopus 001080624600001 2-s2.0-85170411583 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article LI-ION ANIONIC REDOX BAND-GAPS ENERGY SUBSTITUTION BATTERIES TRANSITION CHALLENGES CHEMISTRY Na -ion batteries Oxygen redox Stabilization High voltage First-principle calculation