| Title | Distinct Oxygen Redox Activities in Li2MO3 (M = Mn, Ru, Ir) |
| Authors | Zhuo, Zengqing Dai, Kehua Wu, Jinpeng Zhang, Liang Tamura, Nobumichi Chuang, Yi-de Feng, Jun Guo, Jinghua Shen, Zhi-xun Liu, Gao Pan, Feng Yang, Wanli |
| Affiliation | Peking Univ, Sch Adv Mat, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA Tianjin Normal Univ, Coll Chem, Tianjin 300387, Peoples R China Stanford Inst Mat & Energy Sci, SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China South Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China Stanford Univ, Dept Phys & Appl Phys, Stanford, CA 94305 USA Lawrence Berkeley Natl Lab, Energy Storage & Distributed Resources Div, Energy Technol Area, Berkeley, CA 94720 USA |
| Keywords | LI-ION LATTICE OXYGEN LAYERED OXIDES CAPACITY LI2MNO3 CHALLENGES CHEMISTRY BATTERIES PAIR |
| Issue Date | 8-Oct-2021 |
| Publisher | ACS ENERGY LETTERS |
| Abstract | Li2MO3 (M = transition metal) systems are parent compounds of Li-rich materials and widely considered to offer oxygen redox for high-energy batteries. However, recent clarifications have revealed that, among the three representative Li2MO3 (M = Mn, Ru, Ir) compounds, no reversible oxygen redox takes place in the Mn and Ir systems. Here, we reevaluate the redox reactions in Li2RuO3 through advanced spectroscopy, which shows both Ru redox and highly reversible O redox (96% initial-cycle reversibility, 80% retained after 10 cycles, and 77% after 50 cycles). This is in sharp contrast with the Li2MnO3 and Li2IrO3 systems and concludes the three distinct oxygen behaviors in the Li2MO3 systems during charging: (i) only irreversible oxygen oxidation in Li2MO3; (ii) reversible Ru and O redox in Li2RuO3; (iii) only cationic redox in Li2IrO3. This work suggests the critical role of transition metals and their coupling to oxygen for maintaining reversible oxygen redox activities for high-energy batteries. |
| URI | http://hdl.handle.net/20.500.11897/628525 |
| ISSN | 2380-8195 |
| DOI | 10.1021/acsenergylett.1c01101 |
| Indexed | SCI(E) |
| Appears in Collections: | 新材料学院 |
