Stabilizing Surface Lattice O<i><sup>n</sup></i><sup>−</sup> (0 &lt; <i>n</i> &lt; 2) for Long‐Term Durability of LiCoO<sub>2</sub>

Abstract The instability of surface lattice O n − (0 &lt; n &lt; 2) in charged LiCoO₂ (LCO) limits its long‐term cycling stability beyond 4.55 V versus Li/Li⁺. Herein, the spinel and rock‐salt (RS) phases are constructed on LCO surface to stabilize lattice O n − , namely S‐LCO and R‐LCO, respectively. Upon long‐term cycling at 4.6 V, the loss of lattice O n − leads to a progressive deterioration of surface spinel phase, which ultimately transforms into a strong Li + ‐blocking phase. In contrast, for R‐LCO, the surface lattice O n − in the RS phase remains stable in long‐term cycles. Theoretical calculations reveal that the migration barriers of lattice O n − are significantly higher in the RS phase than in the spinel phase. Due to the stabilized surface lattice O n − , the R‐LCO||Li cell shows an impressive capacity retention of 78.6% after 1000 cycles at 4.6 V (at 1C rate) and superior floating charge durability at 45 °C. This study highlights the importance of surface structure tailoring in developing advanced LCO cathodes.

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Publication Details

Journal
Angewandte Chemie
Published
2025-03-28
DOI
https://doi.org/10.1002/ange.202503100
Citations
7
Primary Topic
Semiconductor materials and devices
Type
article
Field-Weighted Citation Impact
5.11
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Stabilizing Surface Lattice On− (0 < n < 2) for Long‐Term Durability of LiCoO2

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7 citations
Angewandte Chemie
Semiconductor materials and devices
5.11
article

Stabilizing Surface Lattice On− (0 < n < 2) for Long‐Term Durability of LiCoO2

Hai Lin, Bin Fei, Shunning Li, Xingxing Yin, Hengyu Ren, Feng Pan, Guojie Chen, Qinghe Zhao, Wangyang Ding, Zijian Li, Mingyang Li, Dong Zhou, Wenguang Zhao, Xiaohu Wang, Lin Zhou, Shiming Chen, Haocong Yi, Jun Wang
article en
7 citations

Abstract

Abstract The instability of surface lattice O n − (0 &lt; n &lt; 2) in charged LiCoO₂ (LCO) limits its long‐term cycling stability beyond 4.55 V versus Li/Li⁺. Herein, the spinel and rock‐salt (RS) phases are constructed on LCO surface to stabilize lattice O n − , namely S‐LCO and R‐LCO, respectively. Upon long‐term cycling at 4.6 V, the loss of lattice O n − leads to a progressive deterioration of surface spinel phase, which ultimately transforms into a strong Li + ‐blocking phase. In contrast, for R‐LCO, the surface lattice O n − in the RS phase remains stable in long‐term cycles. Theoretical calculations reveal that the migration barriers of lattice O n − are significantly higher in the RS phase than in the spinel phase. Due to the stabilized surface lattice O n − , the R‐LCO||Li cell shows an impressive capacity retention of 78.6% after 1000 cycles at 4.6 V (at 1C rate) and superior floating charge durability at 45 °C. This study highlights the importance of surface structure tailoring in developing advanced LCO cathodes.

Angewandte ChemieVol. 137(23)
King University (US), Hong Kong Polytechnic University (HK), Sun Yat-sen University (CN), Shenzhen University (CN), Peking University (CN), Southern University of Science and Technology (CN), University of Malaya (MY), Advanced Energy (United States) (US), Peking University Shenzhen Hospital (CN)
Openalex Percentile: Top 5%
Semiconductor materials and devices
5.11
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