Bimetallic synergistic modified layer promotes the cyclic stability of LiCoO2 under 4.6 V high voltage

Zhang, Jiahao; Zeng, Zao; Wang, Siyi; Han, Tingting; Liu, Jianwen; Wang, Shiquan; Liu, Hongying; Li, Lin

doi:10.1016/j.est.2024.112522

Cited by 2 publications

References 35 publications

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Stabilizing 4.6 V LiCoO₂ via Surface‐to‐Bulk Titanium Modification

Gao,

Li,

Zeng

et al. 2024

Adv Funct Materials

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Elevating the charging cut‐off voltage is an effective strategy to increase the energy density of LiCoO2. However, unstable interfacial structures and unfavorable phase transitions in bulk are inevitably triggered during deep de‐lithiation at high voltage. Herein, an integrated surface‐to‐bulk Ti‐modification strategy is applied to LiCoO2, enabling uniform Li2TiO3 coating on the surface and gradient Ti‐doping toward the structural bulk. The resultant Ti‐modified LiCoO2 (T‐LCO) electrode can be stably cycled up to 4.6 V, providing a high‐rate capability of 137 mAh g−1 at 5C and a long‐life stability with 80.5% capacity retention after 400 cycles at 1C, far outperforming the unmodified LiCoO2 electrode with only 50.7% capacity retention. In situ X‐ray diffraction characterization and density functional theory calculation reveal that the synergistic modification of T‐LCO enhances Li+ diffusion, facilitates the construction of high‐quality cathode/electrolyte interphase, reduces the phase transition from O3 to H1‐3 and Co3d/O2p band overlap, and restrains layer‐to‐spinel phase distortion, thus improving structural stability at 4.6 V. This work presents a “two birds one step” strategy to enhance the cycling stability and achievable capacity of high‐voltage LiCoO2 for developing high energy density lithium‐ion batteries.

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Stabilizing 4.6 V LiCoO₂ via Surface‐to‐Bulk Titanium Modification

Gao,

Li,

Zeng

et al. 2024

Adv Funct Materials

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Effect of TiO2 coating on structure and electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode material for lithium ion batteries

Li,

Kuang

et al. 2024

Preprint

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Many efforts have been made to improve the electrochemical performance of Ni-rich cathode materials, such as metal ion doping, surface modification, and fabricating nanostructured materials. Here, to enhance the electrochemical performance of the LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode, NCM622 was coated by TiO2 layers through the sol-gel process. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and electrochemical tests have been applied for material characterizations and electrochemical measurements. Compared with the pristine NCM622 electrode, the cycling stability and rate performance of the TiO2-coated NCM622 electrodes are significantly improved. Among all TiO2-coated NCM622, the NCM622 cathode with TiO2 coating content of 0.5% demonstrats a highest capacity retention of 89.3% and a discharge capacity of 163.9 mAh g− 1, in contrast to 80.9% and145 mAh g− 1 for the pristine NCM622 electrode, after 100 cycles at 0.3 C between 3-4.3 V. Under the high cutoff voltage of 4.6 V, the 5 wt% TiO2-coated. NCM electrode exhibit better electrochemical properties than bare NCM622 in terms of specific capacity and cyclability, similar to the results measured at a cut-off voltage of 4.3 V. The results prove that TiO2 modification can lower the polarization of the material, effectively raising the cycling stability rate performance of the battery. It provides a reference path for the further progress of high capacity and stability ternary cathode materials.

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Bimetallic synergistic modified layer promotes the cyclic stability of LiCoO2 under 4.6 V high voltage

Cited by 2 publications

References 35 publications

Stabilizing 4.6 V LiCoO₂ via Surface‐to‐Bulk Titanium Modification

Stabilizing 4.6 V LiCoO₂ via Surface‐to‐Bulk Titanium Modification

Effect of TiO2 coating on structure and electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode material for lithium ion batteries

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Bimetallic synergistic modified layer promotes the cyclic stability of LiCoO2 under 4.6 V high voltage

Cited by 2 publications

References 35 publications

Stabilizing 4.6 V LiCoO2 via Surface‐to‐Bulk Titanium Modification

Stabilizing 4.6 V LiCoO2 via Surface‐to‐Bulk Titanium Modification

Effect of TiO2 coating on structure and electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode material for lithium ion batteries

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Stabilizing 4.6 V LiCoO₂ via Surface‐to‐Bulk Titanium Modification

Stabilizing 4.6 V LiCoO₂ via Surface‐to‐Bulk Titanium Modification