DataVXACS Energy LettersPaper
journal article·2022-07-08

Triggering and Stabilizing Oxygen Redox Chemistry in Layered Li[Na1/3Ru2/3]O2 Enabled by Stable Li–O–Na Configuration

Xin Cao, Haifeng Li, Yu Qiao, Zhi Chang, Pengfei Wang, Chao Li, Xiyan Yue, Ping He, Jordi Cabana, Haoshen Zhou

ACS Energy Letters· Volume 7· Issue 7
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Source abstract

Abstract

Li-rich layered oxides are promising cathode candidates for high-energy-density Li-ion batteries because of the combination of cationic and anionic redox activities. However, severe lattice oxygen loss inevitably induces irreversible Li migration in both transition metal (TM) and Li layers, which degrades the stability of the Li–O–Li configuration, resulting in serious structure distortion and capacity decay. Herein, a Li–O–Na configuration was first introduced in Li-based layered oxides by Na substitution within TM layers, which not only obtained a discharge capacity of 232 mAh g–1 boosted by oxygen redox reactions but also achieved superior structural and electrochemical stability upon cycling (capacity retention of 83.2% after 1000 cycles). Moreover, comprehensive analyses of anionic/cationic redox activities clarify the underlying charge compensation mechanisms upon cycling. Altogether, these findings demonstrated that the Li–O–Na configuration can be regarded as an effective structure to achieve stable oxygen redox chemistry within Li-based cathode materials.
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Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba 305-8568, Japan

Graduate School of System and Information Engineering, University of Tsukuba, 1-1-1, Tennoudai, Tsukuba 305-8573, Japan

Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States

Center of Energy Storage Materials & Technology, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China

Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, P. R. China

Graduate School of Science and Technology, Hirosaki University, 1-Bunkyocho, Hirosaki 036-8560, Japan

Funding

China Scholarship Council · Division of Materials Research

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