journal article·2021-10-08Open access

Distinct Oxygen Redox Activities in Li2MO3 (M = Mn, Ru, Ir)

Zengqing Zhuo, Kehua Dai, Jinpeng Wu, Liang Zhang, Nobumichi Tamura, Yi-de Chuang, Jun Feng, Jinghua Guo, Zhi-xun Shen, Gao Liu, Feng Pan, Wanli Yang

ACS Energy Letters· Volume 6· Issue 10

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 Li2MnO3; (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.
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Research context

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced battery technologies research

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Affiliations

School of Advanced Materials, Peking University, Shenzhen Graduate School, Shenzhen 518055, China

Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States

College of Chemistry, Tianjin Normal University, Tianjin 300387, China

Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States

Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, United States

Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

Department of Materials Science and Engineering, South University of Science and Technology, Shenzhen 518055, China

Department of Physics and Applied Physics, Stanford University, Stanford, California 94305, United States

Energy Storage and Distributed Resources Division, Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Funding

Office of Science

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