Fabrication and interfacial characterization of Ni-rich thin-film cathodes for stable Li-ion batteries

Jiang, Ming; Wu, Xiaochao; Zhang, Qian; Danilov, Dmitri L.; Eichel, Rüdiger-Albert; Notten, Peter H. L.

doi:10.1016/j.electacta.2021.139316

Cited by 16 publications

(9 citation statements)

References 53 publications

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“…While there are so far few examples for the use of GCIS in battery research, it offers promise due to its ability to sputter etch soft materials without leaving much chemical damage. 81,82 This is a result of using large clusters of argon atoms (up to several thousand atoms) with large incident energies (up to tens of thousands eV), giving a low average energy per atom. The low energy prevents significant chemical damage, but the large clusters allow for the removal of material from the sample at appreciable rates (though often not so high rate as for monatomic sputter etching).…”

Section: Ion Sputter Etchingmentioning

confidence: 99%

Advances in studying interfacial reactions in rechargeable batteries by photoelectron spectroscopy

et al. 2022

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Section: Ion Sputter Etchingmentioning

confidence: 99%

Advances in studying interfacial reactions in rechargeable batteries by photoelectron spectroscopy

et al. 2022

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“…In the O 1 s spectra ( Figure a), the peaks located at 529.4 and 531.4 eV can be assigned to the lattice oxygen (metal–oxygen) and surface oxygen, respectively. [ 18 ] Slightly shift to the lower energy of TMO bonding energy suggests a relatively weak TMO bond, further indicating the formation of oxygen vacancies at the particle surface. These oxygen vacancies on the surface play a critical role in the electrochemical properties as widely proved in the Li‐rich cathode materials.…”

Section: Resultsmentioning

confidence: 99%

Regulation of Surface Defect Chemistry toward Stable Ni‐Rich Cathodes

et al. 2022

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Surface reconstruction of Ni‐rich layered oxides (NLO) degrades the cycling stability and safety of high‐energy‐density lithium‐ion batteries (LIBs), which challenges typical surface‐modification approaches to build a robust interface with electrochemical activity. Here, a strategy of leveraging the low‐strain analogues of Li‐ and Mn‐rich layered oxides (LMR) to reconstruct a stable surface on the Ni‐rich layered cathodes is proposed. The new surface structure not only consists of a gradient chemical composition but also contains a defect‐rich structure regarding the formation of oxygen vacancies and cationic ordering, which can simultaneously facilitate lithium diffusion and stabilize the crystal structure during the (de)lithiation. These features in the NLO lead to a dramatic improvement in electrochemical properties, especially the cyclability under high voltage cycling, exhibiting the 30% increase in capacity retention after 200 cycles at the current density of 1 C (3.0–4.6 V). The findings offer a facile and effective way to regulate defect chemistry and surface structure in parallel on Ni‐rich layered structure cathodes to achieve high‐energy density LIBs.

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“…Finally, GITT measurements were carried out on these samples, and the relaxation time was extended to 3 h by the so-called voltage-prediction method so that the electrode could be considered to reach the equilibrium state. 34 The corresponding Li-ion diffusion coefficients during the discharge process calculated by GITT measurements are found to be more accurate.…”

Section: Introductionmentioning

confidence: 88%

“…It was found that Li 3 PO 4 can improve the Coulombic efficiency and stability of Si anodes, indicating that Li 3 PO 4 is an excellent artificial layer to protect Si anodes. Finally, GITT measurements were carried out on these samples, and the relaxation time was extended to 3 h by the so-called voltage-prediction method so that the electrode could be considered to reach the equilibrium state . The corresponding Li-ion diffusion coefficients during the discharge process calculated by GITT measurements are found to be more accurate.…”

Section: Introductionmentioning

confidence: 99%

Influence of the SEI Formation on the Stability and Lithium Diffusion in Si Electrodes

Chen

Danilov

et al. 2022

ACS Omega

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Silicon (Si) is an attractive anode material for Li-ion batteries (LIBs) due to its high theoretical specific capacity. However, the solid–electrolyte interphase (SEI) formation, caused by liquid electrolyte decomposition, often befalls Si electrodes. The SEI layer is less Li-ion conductive, which would significantly inhibit Li-ion transport and delay the reaction kinetics. Understanding the interaction between the SEI components and Li-ion diffusion is crucial for further improving the cycling performance of Si. Herein, different liquid electrolytes are applied to investigate the induced SEI components, structures, and their role in Li-ion transport. It is found that Si electrodes exhibit higher discharge capacities in LiClO 4 -based electrolytes than in LiPF 6 -based electrolytes. This behavior suggests that a denser and more conductive SEI layer is formed in LiClO 4 -based electrolytes. In addition, a coating of a Li 3 PO 4 artificial SEI layer on Si suppresses the formation of natural SEI formation, leading to higher capacity retentions. Furthermore, galvanostatic intermittent titration technique (GITT) measurements are applied to calculate Li-ion diffusion coefficients, which are found in the range of 10 –23 –10 –19 m 2 /s.

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Fabrication and interfacial characterization of Ni-rich thin-film cathodes for stable Li-ion batteries

Cited by 16 publications

References 53 publications

Advances in studying interfacial reactions in rechargeable batteries by photoelectron spectroscopy

Advances in studying interfacial reactions in rechargeable batteries by photoelectron spectroscopy

Regulation of Surface Defect Chemistry toward Stable Ni‐Rich Cathodes

Influence of the SEI Formation on the Stability and Lithium Diffusion in Si Electrodes

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