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journal article·2021-08

Critical Role of Ti4+ in Stabilizing High‐Voltage Redox Reactions in Li‐Rich Layered Material

Moses Cho, Seok Hyun Song, Seokjae Hong, Kyoung Sun Kim, Maxim Avdeev, Jong‐Gyu Yoo, Kyung‐Tae Ko, Jihyun Hong, Jongsoon Kim, Seongsu Lee, Hyungsub Kim

Small· Volume 17· Issue 32
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Source abstract

Abstract

Abstract Li‐rich layered oxide materials are considered promising candidates for high‐capacity cathodes for battery applications and improving the reversibility of the anionic redox reaction is the key to exploiting the full capacity of these materials. However, permanent structural change of the electrode occurring upon electrochemical cycling results in capacity and voltage decay. In view of these factors, Ti4+‐substituted Li2IrO3 (Li2Ir0.75Ti0.25O3) is synthesized, which undergoes an oxygen redox reaction with suppressed voltage decay, yielding improved electrochemical performance and good capacity retention. It is shown that the increased bond covalency upon Ti4+ substitution results in structural stability, tuning the phase stability from O3 to O1′ upon de‐lithiation during charging compared with O3 to T3 and O1 for pristine Li2IrO3, thereby facilitating the oxidation of oxygen. This work unravels the role of Ti4+ in stabilizing the cathode framework, providing insight for a fundamental design approach for advanced Li‐rich layered oxide battery 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

Neutron Science Division Korea Atomic Energy Research Institute (KAERI) 111 Daedeok‐daero 989 Beon‐Gil, Yuseong‐gu Daejeon 34 057 Republic of Korea

Department of Chemical and Biological Engineering Korea University 145 Anam‐Ro, Seongbuk‐Gu Seoul 0 2841 Republic of Korea

Australian Nuclear Science and Technology Organisation (ANSTO) New Illawarra Rd Lucas Heights NSW 2232 Australia

Max Planck POSTECH/Hsinchu Center for Complex Phase Materials 67 Cheongam‐ro Pohang 37 673 Republic of Korea

Department of Physics Pohang University of Science and Technology 67 Cheongam‐ro Pohang 37 673 Republic of Korea

Research Center for Materials Analysis Korea Basic Science Institute (KBSI) 169‐148 Gwahak‐ro, Yuseong‐gu Daejeon 34 133 Republic of Korea

Center for Energy Materials Research Korea Institute of Science and Technology (KIST) 5 Hwarang‐ro 14 Gil, Seongbuk‐gu Seoul 02792 Republic of Korea

Department of Energy Science Sungkyunkwan University Suwon 16419 Republic of Korea

Funding

National Research Foundation of Korea · Korea Atomic Energy Research Institute

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