DataVXAdvanced MaterialsPaper
journal article·2019-10

Tuning Oxygen Redox Chemistry in Li‐Rich Mn‐Based Layered Oxide Cathodes by Modulating Cation Arrangement

Jicheng Zhang, Fangyi Cheng, Shulei Chou, Jianli Wang, Lin Gu, Heng Wang, Hirofumi Yoshikawa, Yong Lu, Jun Chen

Advanced Materials· Volume 31· Issue 42
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Source abstract

Abstract

Abstract Li‐rich Mn‐based oxides (LRMO) are promising cathode materials to build next‐generation lithium‐ion batteries with high energy density exceeding 400 W h kg−1. However, due to a lack of in‐depth understanding of oxygen redox chemistry in LRMO, voltage decay is not resolved thoroughly. Here, it is demonstrated that the oxygen redox chemistry could be tuned by modulating cation arrangement. It declares that the materials with Li/Ni disorder and Li vacancies can inhibit the formation of OO dimers. Because of the high chemical activity, OO dimers could accelerate lattice oxygen release and NiO/spinel formation. The samples without forming OO dimers show improved performance in suppressing oxygen overoxidation and mitigating cation dissolution. As a result, the optimized cathode exhibits a high capacity over 280 mA h g−1 at 0.1 C and a high plateau voltage of 3.58 V with a very low voltage decay of 1.6% after 150 cycles at 1 C. This study opens an attractive path in designing Li‐rich electrodes with stabilized redox chemistry.
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Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Extraction and Separation Processes

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

Affiliations

Key Laboratory of Advanced Energy Materials Chemistry College of Chemistry Nankai University Tianjin 300071 China

Renewable Energy Conversion and Storage Center Nankai University Tianjin 300071 China

Australian Institute of Innovative Materials University of Wollongong New South Wales North Wollongong 2500 Australia

Insititute of Physics Chinese Academy of Science Beijing 100190 China

School of Material and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou 450002 China

School of Science and Technology Kwansei Gakuin University 2‐1 Gakuen, Sanda Hyogo 669‐1337 Japan

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Ministry of Education of the People's Republic of China · Fundamental Research Funds for the Central Universities · China Postdoctoral Science Foundation

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