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journal article·2024-07

Stabilizing 4.6 V LiCoO2 via Er and Mg Trace Doping at Li‐Site and Co‐Site Respectively

Jing Xia, Na Zhang, Ding Yi, Fei Lu, Yijun Yang, Xi Wang, Yonggang Wang

Small· Volume 20· Issue 29
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Source abstract

Abstract

Abstract Charging LiCoO2 to high voltages yields alluring specific capacities, yet the deleterious phase‐transitions lead to significant capacity degradation. Herein, this study demonstrates a novel strategy to stabilize LiCoO2 at 4.6 V by doping with Er and Mg at the Li‐site and Co‐site, respectively, which is different from the traditional method of doping foreign elements solely at the Co‐site. Theoretical calculations and experiments jointly reveal that the inclusion of Mg2+‐dopants at the Co‐site curbs the hexagonal‐monoclinic phase transitions ≈4.2 V. However, this unintentionally compromises the stability of lattice oxygen in LiCoO2, exacerbating the undesired phase transition (O3 to H1‐3) above 4.45 V. Fascinatingly, the introduction of Er3+‐dopants into Li‐sites enhances the stability of lattice oxygen in LiCoO2, effectively mitigating phase transitions above 4.45 V. Therefore, the Er, Mg co‐doped LiCoO2 exhibits high stability over 500 cycles when tested in a half‐cell with a cut‐off voltage of 4.6 V. Furthermore, the Er, Mg‐doped LiCoO2//graphite pouch‐type full cell demonstrates a high energy density of 310.8 Wh kg−1, preserving 91.3% of its energy over 100 cycles.
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Research context

OpenAlex topics: Advancements in Battery Materials · Semiconductor materials and devices · Supercapacitor Materials and Fabrication

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

Affiliations

College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China

Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM) Xiamen 361102 P. R. China

Institute of Molecular Plus Tianjin University Tianjin 300072 P. R. China

Key Laboratory of Luminescence and Optical Information Technology Department of Physics School of Physical Science and Engineering Beijing Jiaotong University Beijing 100044 P. R. China

Tangshan Research Institute of Beijing Jiaotong University Tangshan 063000 P. R. China

College of Physical Science and Technology Yangzhou University Yangzhou 225002 P. R. China

Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Institute of New Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Fudan University Shanghai 200433 P. R. China

Funding

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

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