@article{35238,
  author = {Zengqing Zhuo and Kehua Dai and Jinpeng Wu and Liang Zhang and Nobumichi Tamura and Yi- de Chuang and Jun Feng and Jinghua Guo and Zhi-xun Shen and Gao Liu and Feng Pan and Wanli Yang},
  title = {Distinct Oxygen Redox Activities in Li2MO3 (M = Mn, Ru, Ir)},
  abstract = {<p><span>Li</span><sub><span>2</span></sub><span>MO</span><sub><span>3</span></sub><span>&nbsp;(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 Li</span><sub><span>2</span></sub><span>MO</span><sub><span>3</span></sub><span>&nbsp;(M = Mn, Ru, Ir) compounds, no reversible oxygen redox takes place in the Mn and Ir systems. Here, we reevaluate the redox reactions in Li</span><sub><span>2</span></sub><span>RuO</span><sub><span>3</span></sub><span>&nbsp;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 Li</span><sub><span>2</span></sub><span>MnO</span><sub><span>3</span></sub><span>&nbsp;and Li</span><sub><span>2</span></sub><span>IrO</span><sub><span>3</span></sub><span>&nbsp;systems and concludes the three distinct oxygen behaviors in the Li</span><sub><span>2</span></sub><span>MO</span><sub><span>3</span></sub><span>&nbsp;systems during charging: (i) only irreversible oxygen oxidation in Li</span><sub><span>2</span></sub><span>MnO</span><sub><span>3</span></sub><span>; (ii) reversible Ru and O redox in Li</span><sub><span>2</span></sub><span>RuO</span><sub><span>3</span></sub><span>; (iii) only cationic redox in Li</span><sub><span>2</span></sub><span>IrO</span><sub><span>3</span></sub><span>. This work suggests the critical role of transition metals and their coupling to oxygen for maintaining reversible oxygen redox activities for high-energy batteries.</span></p>},
  year = {2021},
  journal = {ACS Energy Letters},
  volume = {6},
  pages = {3417 - 3424},
  month = {10/2021},
  issn = {2380-8195},
  url = {https://pubs.acs.org/doi/10.1021/acsenergylett.1c01101},
  doi = {10.1021/acsenergylett.1c0110110.1021/acsenergylett.1c01101.s001},
  language = {eng},
}