Ce &amp; F multifunctional modification improves the electrochemical performance of LiCoO2 at 4.60 V

Feng, Jiangli; Wang, Chenhui; Lei, Hailin; Liu, Songtao; Liu, Jing; Han, You; Zhang, Jinli; Li, Wei

doi:10.1016/j.jechem.2023.06.033

Cited by 7 publications

(5 citation statements)

References 54 publications

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“…The full spectra of NM indicate Ni 2p, Mn 2p, O 1s, and C 1s peaks (Figure a). As shown in Figure b, Ni 2p XPS spectra of NM show the peaks at binding energies of 854.31 and 871.75 eV due to Ni 2+ , as well as those at 855.61 and 873.17 eV due to Ni 3+ . , For the O 1s XPS spectra, the peaks of NM appear at 528.69, 530.76, and 533.30 eV (Figure c), corresponding respectively to the lattice oxygen, oxygen vacancy, and the adsorbed oxygen at the surface. , …”

Section: Resultsmentioning

confidence: 89%

“…Figure e compares the total density of states (TDOS) between NMFe#1 and NM, indicating that NM has a band gap of 1.67 eV while NMFe#1 has a smaller gap (1.54 eV). The smaller band gap suggests easier electron transfer during the charge/discharge process. , The Li layer spacing is displayed in Figure f for NM and Figure g for NMFe#1, illustrating the enlarged Li layer spacings in NMFe#1, which is beneficial to accelerate the diffusion of Li + . Figure S8g,h show the Li layer spacings in NMFe#2 and NMFe#3.…”

Section: Resultsmentioning

confidence: 98%

“…The smaller band gap suggests easier electron transfer during the charge/discharge process. 45,49 The Li layer spacing is displayed in Figure 7f for NM and Figure 7g for NMFe#1, illustrating the enlarged Li layer spacings in NMFe#1, which is beneficial to accelerate the diffusion of Li + . Figure S8g,h show the Li layer spacings in NMFe#2 and NMFe#3.…”

Section: Resultsmentioning

confidence: 98%

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Fe Dopants Intensify the Electrochemical Performance of LiNi_0.60Mn_0.40O₂ Cathode Materials

Liao,

Wang,

Liu

et al. 2024

Ind. Eng. Chem. Res.

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Co-free Ni-rich layered oxide cathodes need urgent development due to the continuously increasing demand for highperformance lithium-ion batteries. Here, the cathode materials of LiNi 0.60 Mn 0.40 O 2 (NM) and Fe-doped LiNi 0.60 Mn 0.40−x Fe x O 2 (NMFe, x = 0.01−0.05) were prepared via a coprecipitation method associated with a high shear mixer, and the corresponding electrochemical performance was assessed. The optimal Fe-doped sample (NMFe-3) exhibits a discharge capacity of 185.3 mAh•g −1 (0.1C), higher than that of NM (182.5 mAh•g −1 ) at 2.8−4.5 V and 25 °C. Characterization based on XRD, XPS, HRTEM, EIS, CV, and GITT tests illustrates the presence of LiFeO 2 crystal planes inside the NMFe samples, the lower values of the electrode/electrolyte interface impedance of the Fe-doped samples, and the charge-transfer impedance of the electrodes, as well as higher Li + diffusion rate during charge/discharge processes. In situ XRD tests confirm that NMFe-3 exhibits excellent reversible phase transition during the charge/discharge process. DFT calculations disclose that Fe dopants would make Li layer spacings enlarged and lower the energy barrier of Li + diffusion. This work provides a facile route to synthesize Fe-substituted Co-free Ni-rich cathode materials with excellent electrochemical performance for lithium-ion batteries.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

See 1 more Smart Citation

Fe Dopants Intensify the Electrochemical Performance of LiNi_0.60Mn_0.40O₂ Cathode Materials

Liao,

Wang,

Liu

et al. 2024

Ind. Eng. Chem. Res.

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“…It is still a great challenge to achieve satisfactory ORR/OER electrocatalysts. However, metal fluoride has only recently gained attention, with most focus on its application as a solid material in supercapacitors, perovskites, and lithium-ion batteries. − As a negative electrode material for zinc-air batteries, this is seldom mentioned. Notably, because fluorine is the most electronegative element and can draw electrons from neighboring metals, metal fluoride should be a promising candidate for high-performance bifunctional ORR/OER electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Oxygen Electrocatalyst for Rechargeable Zinc-Air Batteries: Surface-Oxidized Cobaltous Fluoride Nanocrystals Embedded in Carbon Nanofibers

Qiao,

Zhang,

et al. 2024

ACS Appl. Eng. Mater.

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The rational design and control of active sites are essential for achieving a highly active and stable electrocatalyst. Herein, we report a bifunctional oxygen electrocatalyst, nanocrystals of CoF 2 -inserted carbon nanofibers, which was prepared by electrospinning and a subsequent fluorination process. Due to the large specific surface area and hierarchical porous structure, carbon nanofibers provide rapid mass transfer and expose more active sites for electrocatalytic oxygen reactions. The surface-oxidized CoF 2 nanocrystals show high electroactivity for both the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in alkaline solution, marked by up to 0.822 V of the ORR half-wave potential and as low as 370 mV of the OER overpotential. Benefiting from the excellent electrocatalysis activity, this material exhibits an excellent application prospect in rechargeable zinc-air batteries. As an air electrode catalyst, it can endow the zinc-air battery with a high specific capacity (871.2 mAh g −1 ), a large power density (124.30 mW cm −2 ), and excellent stability (120 h continuous charge/discharge), dramatically outperforming that of commercial Pt/C and RuO 2 electrocatalysts. Density-functional theory (DFT) calculations indicate that surface oxygen atoms on CoF 2 play a key role in enhancing the activity of Co atoms by p-d orbital hybridization. This work provides a perspective for designing bifunctional oxygen electrocatalysts urgently needed by rechargeable zinc-air batteries.

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“…Also, it carries the risk of reducing the specific capacity of electrode materials due to the introduction of non-electrochemically active cations [ 27 , 28 ]. Constructing coating layers has been demonstrated as an effective strategy to obtain excellent electrochemical properties of LCO at high working voltages [ 29 , 30 ]. Specifically, coating layers could prevent the contact between LCO and electrolytes, thereby suppressing surface side reactions and promoting a stable surface structure, achieving excellent stability [ 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Construction of Uniform LiF Coating Layers for Stable High-Voltage LiCoO2 Cathodes in Lithium-Ion Batteries

Xiao,

Zhu,

Wang

et al. 2024

Molecules

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Stabilizing LiCoO2 (LCO) at 4.5 V rather than the common 4.2 V is important for the high specific capacity. In this study, we developed a simple and efficient way to improve the stability of LiCoO2 at high voltages. After a simple sol–gel method, we introduced trifluoroacetic acid (TA) to the surface of LCO via an afterwards calcination. Meanwhile, the TA reacted with residual lithium on the surface of LCO, further leading to the formation of uniform LiF nanoshells. The LiF nanoshells could effectively restrict the interfacial side reaction, hinder the transition metal dissolution and thus achieve a stable cathode–electrolyte interface at high working-voltages. As a result, the LCO@LiF demonstrated a much superior cycling stability with a capacity retention ratio of 83.54% after 100 cycles compared with the bare ones (43.3% for capacity retention), as well as high rate performances. Notably, LiF coating layers endow LCO with excellent high-temperature performances and outstanding full-cell performances. This work provides a simple and effective way to prepare stable LCO materials working at a high voltage.

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Ce & F multifunctional modification improves the electrochemical performance of LiCoO2 at 4.60 V

Cited by 7 publications

References 54 publications

Fe Dopants Intensify the Electrochemical Performance of LiNi_0.60Mn_0.40O₂ Cathode Materials

Fe Dopants Intensify the Electrochemical Performance of LiNi_0.60Mn_0.40O₂ Cathode Materials

Highly Efficient Oxygen Electrocatalyst for Rechargeable Zinc-Air Batteries: Surface-Oxidized Cobaltous Fluoride Nanocrystals Embedded in Carbon Nanofibers

Construction of Uniform LiF Coating Layers for Stable High-Voltage LiCoO2 Cathodes in Lithium-Ion Batteries

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Ce & F multifunctional modification improves the electrochemical performance of LiCoO2 at 4.60 V

Cited by 7 publications

References 54 publications

Fe Dopants Intensify the Electrochemical Performance of LiNi0.60Mn0.40O2 Cathode Materials

Fe Dopants Intensify the Electrochemical Performance of LiNi0.60Mn0.40O2 Cathode Materials

Highly Efficient Oxygen Electrocatalyst for Rechargeable Zinc-Air Batteries: Surface-Oxidized Cobaltous Fluoride Nanocrystals Embedded in Carbon Nanofibers

Construction of Uniform LiF Coating Layers for Stable High-Voltage LiCoO2 Cathodes in Lithium-Ion Batteries

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Product

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Fe Dopants Intensify the Electrochemical Performance of LiNi_0.60Mn_0.40O₂ Cathode Materials

Fe Dopants Intensify the Electrochemical Performance of LiNi_0.60Mn_0.40O₂ Cathode Materials