期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 169, 期 4, 页码 -出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac6459
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [20H05673]
- JSPS [20J14291]
- [21H04697]
- [19H05816]
- Grants-in-Aid for Scientific Research [20J14291, 20H05673] Funding Source: KAKEN
This research reports on a high-capacity O2-type lithium-rich layered oxide Li1.22-x Ru0.78O2, which can achieve stable redox reactions and deliver a high capacity of 200 mAh g(-1).
Increasing the energy density of lithium-ion batteries is an important step towards flexible electricity supply, which can be achieved by developing large-capacity positive electrodes. Lithium-rich oxides have been a longstanding research target because of their large capacity involving extra oxygen-redox reactions. In this work, we report the synthesis, electrochemical properties, electronic structure, and structural evolution of O2-type lithium-rich layered oxide Li1.22-x Ru0.78O2. A robust Ru-O layered framework without Ru migration allows for unveiling the solid-state electrochemistry of O2-type lithium-rich layered oxides with possibility of a large yet stable extra capacity for oxygen-redox reaction. Using a combination of X-ray photoelectron spectroscopy, X-ray absorption/emission spectroscopy, and in situ/ex situ X-ray diffraction, we clarified that O2-Li1.22-x Ru0.78O2 delivers a large capacity of 200 mAh g(-1) in association with Ru5+/Ru4+ and Ru4+/Ru3+ two-electron redox reactions under a solid-solution process, but with no contribution from the extra oxygen-redox reaction.
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