| Title | Cycling mechanism of Li2MnO3: Li-CO2 batteries and commonality on oxygen redox in cathode materials |
| Authors | Zhuo, Zengqing Dai, Kehua Qiao, Ruimin Wang, Rui Wu, Jinpeng Liu, Yali Peng, Jiayue Chen, Liquan Chuang, Yi-de Pan, Feng Shen, Zhi-xun Liu, Gao Li, Hong Devereaux, Thomas P. Yang, Wanli |
| Affiliation | Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA Peking Univ, Sch Adv Mat, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China Lawrence Berkeley Natl Lab, Energy Storage & Distributed Resources Div, Energy Technol Area, Berkeley, CA 94720 USA Tianjin Normal Univ, Coll Chem, Tianjin 300387, Peoples R China Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China Chinese Acad Sci, Inst Phys, Beijing 100190, 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 Stanford Univ, Dept Phys & Appl Phys, Stanford, CA 94305 USA Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA |
| Keywords | POSITIVE ELECTRODE MATERIALS RICH LAYERED OXIDES LI-ION ANIONIC REDOX CHARGE-COMPENSATION ELECTROCHEMICAL-BEHAVIOR ANOMALOUS CAPACITY LATTICE OXYGEN METAL-OXIDES THIN-FILM |
| Issue Date | 21-Apr-2021 |
| Publisher | JOULE |
| Abstract | A SUMMARY Li2MnO3 has been considered to be a representative Li-rich compound with active debates on oxygen activities. Here, by evaluating the Mn and O states in the bulk and on the surface of Li2MnO3, we clarify that Mn( III/IV) redox dominates the reversible bulk redox in Li2MnO3, while the initial charge plateau is from surface reactions with oxygen release and carbonate decomposition. No lattice oxygen redox is involved at any electrochemical stage. The carbonate formation and decomposition indicate the catalytic property of the Li2MnO3 surface, which inspires Li-CO2/air batteries with Li2MnO3 acting as a superior electrocatalyst. The absence of lattice oxygen redox in Li2MnO3 questions the origin of the oxygen redox in Li-rich compounds, which is found to be of the same nature as that in conventional materials based on spectroscopic comparisons. These findings provide guidelines on understanding and controlling oxygen activities toward high-energy cathodes and suggest opportunities on using alkali-rich materials for catalytic reactions. |
| URI | http://hdl.handle.net/20.500.11897/612971 |
| ISSN | 2542-4351 |
| DOI | 10.1016/j.joule.2021.02.004 |
| Indexed | SCI(E) |
| Appears in Collections: | 新材料学院 |
