Li‐Rich Mn–Mg Layered Oxide as a Novel Ni‐/Co‐Free Cathode
Source abstract
Abstract
Abstract Although Li2MnO3 exhibits high capacity via anionic oxygen redox, it suffers from rapid capacity decay owing to structural disordering accompanying irreversible Mn migration and O2 release. To promote the reversibility of the anionic redox reaction, Li1.8Mg0.3Mn0.9O3 as a novel cathode material, prepared by partially substituting Li+ and Mn4+ of Li2MnO3 with the redox‐inactive Mg2+ as a structural stabilizer is proposed. Li1.8Mg0.3Mn0.9O3 delivers a high specific capacity and energy density of ≈310 mAh g−1 and ≈915 Wh kg−1, respectively. In particular, the power‐capability and cycle performance of Li1.8Mg0.3Mn0.9O3 greatly surpass those of Li2MnO3. Through first‐principles calculations and various experiments, it is revealed that Mg substitution effectively suppresses the Mn migration by stabilizing Mn cations in the original sites at the charged state. The energetically stabilized layered structure disfavors the distortion of the MnO6 octahedra, which induces the oxygen dimer (OO) formation through the metal–oxygen decoordination, thus mitigating oxygen release.
Source: crossref · Quality: baseline
Research context
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
Department of Energy Science Sungkyunkwan University Suwon 16419 Republic of Korea
SKKU Institute of Energy Science and Technology (SIEST) Sungkyunkwan University Suwon 16419 Republic of Korea
Advanced Analysis Center Korea Institute of Science and Technology (KIST) Seoul 02792 Republic of Korea
Department of Chemical and Biological Engineering Sookmyung Women's University Seoul 04310 Republic of Korea
Korea Atomic Energy Research Institute (KAERI) Daejeon 34057 Republic of Korea
Battery Materials Research Center Research Institute of Industrial Science and Technology (RIST) Incheon 21985 Republic of Korea
Energy Materials Research Center Korea Institute of Science and Technology (KIST) Seoul 02792 Republic of Korea
Funding
Korea Institute of Science and Technology
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