Bifunctional surface modification coupled with oxygen defect engineering enables high performance Li-rich cathodes

Zheng, Chaoliang; Yang, Zhe; Feng, Jiameng; Zhong, Jianjian; Wei, Zhicheng; Li, Jianling

doi:10.1039/d2ta03475a

Cited by 25 publications

(10 citation statements)

References 51 publications

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“…It is also reported that oxygen defects can ensure a high degree of oxygen redox. 39 Furthermore, it is claimed that the phase transitions and volume variation are very sensitive to the impurity levels of LiCoO 2 particles and it can be used as a quality check for the synthetic LiCoO 2 material. 13,40 increases after more than 62.5-75% removal of Li (Fig.…”

Section: Methodsmentioning

confidence: 99%

Atomic-scale insight into the lattice volume plunge of Li_xCoO₂ upon deep delithiation

Wang

Zhang

et al. 2023

Energy Adv.

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Section: Methodsmentioning

confidence: 99%

Atomic-scale insight into the lattice volume plunge of Li_xCoO₂ upon deep delithiation

Wang

Zhang

et al. 2023

Energy Adv.

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“…The structural deterioration of the material will gradually extend from the surface to the interior, eventually exacerbating the performance decay of the material. [6] To solve the above problems, a variety of modification means have been proposed, such as element doping, [7] surface modification [8] and pretreatment, [9] etc. Among them, surface coating has become one of the most effective modification methods to improve the interfacial stability of the material.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Cycling Stability of Lithium‐Rich Cathode Materials Achieved by in‐situ Formation of LiErO₂ Coating

Wei

Zhang

Zhong

et al. 2023

Batteries & Supercaps

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Lithium‐rich manganese‐based cathode materials are considered ideal for the next‐generation lithium‐ion power batteries due to their high specific capacity. However, their widespread commercial deployment has received serious limitations, such as low initial coulombic efficiency (ICE), severe voltage and capacity degradation. To solve these issues, the surface of Li‐rich layered oxide (LLO) material is uniformly coated with a layer of ternary lithium‐rare earth oxides LiErO2 by synchronous lithium strategy. The LiErO2‐coated material exhibits higher capacity retention of 83.79 % with 182.7 mAh g−1 compared with that of the pristine material, which retained 60.54 % with 144.1 mAh g−1 after 200 cycles at 0.5 C. The excellent electrochemical performance is owing to the high Li+ conductivity of the LiErO2 coating which enhanced the lithiation kinetics of the material, and X‐ray photoelectron spectrometer (XPS) results indicate coating layer has abundant oxygen vacancies that facilitate reversible redox processes of oxygen. Meanwhile, the results of high resolution transmission electron microscope (HRTEM) and XPS analyses of the materials after cycling shows the uniform coating can suppress the side reactions between the electrode and electrolyte during long‐term cycling, reduce the phase transition of the surface structure, and enhance interfacial stability. This work provides innovative ideas for the design of lithium‐rich cathode materials.

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“…It attributed to PMO coating layers can effectively reduce the side reaction with electrolyte, increase the conductivity of Li + and effectively reduce the mixing of Li + /Ni 2 + , maintain the stability of structure, [9] and greatly increase the reversible capacity of LLOs. [10] Chaoliang Zheng et al [11] firstly propose to coat a layer of completely cyclized polyacrylonitrile on the surface of the Lirich cathode Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 , which forms a spinel layer and abundant oxygen vacancies on the surface to alleviate the above problems. As shown by the superior electrochemical performance, the specific capacity of the modified material was increased to 175 mAh g À 1 with a capacity retention rate of 73.7 % after 275 cycles at 0.5 C. Moreover, other coating oxides have also been used for surface coating modification of LLOs, which can help to improve the electrochemical performance of LLOs.…”

Section: Introductionmentioning

confidence: 99%

Dual Strategies with Anion/Cation Co‐Doping and Lithium Carbonate Coating to Enhance the Electrochemical Performance of Lithium‐Rich Layered Oxides

Chen,

Ma,

Liu

et al. 2023

Chemistry A European J

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Lithium‐rich layered oxides (LLOs, Li1.2Mn0.54Ni0.13Co0.13O2) are widely used as cathode materials for lithium‐ion batteries due to its high specific capacity, high operating voltage and low cost. However, the LLOs are faced with rapid decay of charge/discharge capacity and voltage, as well as interface side reactions, which limit its electrochemical performance. Herein, the dual strategies of sulfite/sodium ion co‐doping and lithium carbonate coating were used to improve it. It founds that modified LLOs achieve 88.74% initial coulomb efficiency, 295.3 mAh g–1 first turn discharge capacity, in addition to 216.9 mAh g–1 at 1 C, and 87.23% capacity retention after 100 cycles. Mechanism research indicated that the excellent electrochemical performance benefits from the doping of both Na+ and SO32‐, and it could significantly reduce the migration energy barrier of Li+ and promote Li+ migration. Meanwhile, anion and cation are co‐doped greatly reduces the band gap of LLOs and increase its electrical conductivity, and no electron spin barrier leap effect at the Fermi level. In addition, the lithium carbonate coating significantly inhibits the occurrence of interfacial side reactions of LLOs. This work provides a theoretical basis and practical guidance for the further development of LLOs with higher electrochemical performance.

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Bifunctional surface modification coupled with oxygen defect engineering enables high performance Li-rich cathodes

Abstract: Through the total cyclization of polyacrylonitrile, a bifunctional surface and abundant oxygen defects were constructed on the lithium-rich cathode, leading to an excellent electrochemical performance.

Cited by 25 publications

References 51 publications

Atomic-scale insight into the lattice volume plunge of Li_xCoO₂ upon deep delithiation

Atomic-scale insight into the lattice volume plunge of Li_xCoO₂ upon deep delithiation

Enhanced Cycling Stability of Lithium‐Rich Cathode Materials Achieved by in‐situ Formation of LiErO₂ Coating

Dual Strategies with Anion/Cation Co‐Doping and Lithium Carbonate Coating to Enhance the Electrochemical Performance of Lithium‐Rich Layered Oxides

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Bifunctional surface modification coupled with oxygen defect engineering enables high performance Li-rich cathodes

Abstract: Through the total cyclization of polyacrylonitrile, a bifunctional surface and abundant oxygen defects were constructed on the lithium-rich cathode, leading to an excellent electrochemical performance.

Cited by 25 publications

References 51 publications

Atomic-scale insight into the lattice volume plunge of LixCoO2 upon deep delithiation

Atomic-scale insight into the lattice volume plunge of LixCoO2 upon deep delithiation

Enhanced Cycling Stability of Lithium‐Rich Cathode Materials Achieved by in‐situ Formation of LiErO2 Coating

Dual Strategies with Anion/Cation Co‐Doping and Lithium Carbonate Coating to Enhance the Electrochemical Performance of Lithium‐Rich Layered Oxides

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Atomic-scale insight into the lattice volume plunge of Li_xCoO₂ upon deep delithiation

Atomic-scale insight into the lattice volume plunge of Li_xCoO₂ upon deep delithiation

Enhanced Cycling Stability of Lithium‐Rich Cathode Materials Achieved by in‐situ Formation of LiErO₂ Coating