Phase evolution and Sn-substitution in LiMn2O4 thin films prepared by pulsed laser deposition

Shin, Dong Wook; Choi, Ji Won; Cho, Yong Soo; Yoon, Seok Jin

doi:10.1007/s10832-007-9378-x

Cited by 11 publications

(5 citation statements)

References 20 publications

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“…The generated Bi 2 O 3 was vaporized during the spinel Fe 3 O 4 composite creation (Figure ). The morphology prepared by PLD is controlled by the power of the pulse, the flow rate of the gas, and the temperature of the substrate …”

Section: Preparationmentioning

confidence: 99%

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Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

et al. 2017

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Spinels with the formula of ABO (where A and B are metal ions) and the properties of magnetism, optics, electricity, and catalysis have taken significant roles in applications of data storage, biotechnology, electronics, laser, sensor, conversion reaction, and energy storage/conversion, which largely depend on their precise structures and compositions. In this review, various spinels with controlled preparations and their applications in oxygen reduction/evolution reaction (ORR/OER) and beyond are summarized. First, the composition and structure of spinels are introduced. Then, recent advances in the preparation of spinels with solid-, solution-, and vapor-phase methods are summarized, and new methods are particularly highlighted. The physicochemical characteristics of spinels such as their compositions, structures, morphologies, defects, and substrates have been rationally regulated through various approaches. This regulation can yield spinels with improved ORR/OER catalytic activities, which can further accelerate the speed, prolong the life, and narrow the polarization of fuel cells, metal-air batteries, and water splitting devices. Finally, the magnetic, optical, electrical, and catalytic applications beyond the OER/ORR are also discussed. The future applications of spinels are considered to be closely related to environmental and energy issues, which will be aided by the development of new species with precise preparations and advanced characterizations.

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Section: Preparationmentioning

confidence: 99%

“…208 The morphology prepared by PLD is controlled by the power of the pulse, the flow rate of the gas, and the temperature of the substrate. 209 3.2. Solution-Phase Method 3.2.1.…”

Section: Preparationmentioning

confidence: 99%

Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

et al. 2017

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“…magnetron sputtering as synthesizing route of LiMn 2 O 4 thin films could very well be a solution when considering that powdered LiMn 2 O 4 shows less capacity retention during cycling and storage 3,4 . Therefore, thin films made of LiMn 2 O 4 have been deposited in the past by processes like electron beam evaporation 5 , electrostatic spray deposition (ESD) 6 , pulsed laser deposition (PLD) [7][8][9] or r.f. magnetron sputtering [10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Laser modification and characterization of Li-Mn-O thin film cathodes for lithium-ion batteries

et al. 2011

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The development of future battery systems is mainly focused on powerful rechargeable lithium-ion batteries. To satisfy this demand, current studies are focused on cathodes based on nano-composite materials which lead to an increase in power density of the LIB primarily due to large electrochemically active surface areas. Electrode materials made of lithium manganese oxides (Li-Mn-O) are assumed to replace commonly used cathode materials like LiCoO 2 due to less toxicity and lower costs. Thin films in the Li-Mn-O system were synthesized by non-reactive r.f. magnetron sputtering of a LiMn 2 O 4 target on silicon and stainless steel substrates. In order to enhance power density and cycle stability of the cathode material, direct laser structuring methods were investigated using a laser system operating at a wavelength of 248 nm. Therefore, high aspect ratio micro-structures were formed on the thin films. Laser annealing processes were investigated in order to achieve an appropriate crystalline phase for unstructured and structured thin films as well as for an increase in energy density and control of grain size. Laser annealing was realized via a high power diode laser system. The effects of post-thermal treatment on the thin films were studied with Raman spectroscopy, X-ray diffraction and scanning electron microscopy. The formation of electrochemically active and inactive phases was discussed. Surface chemistry was investigated via X-ray photoelectron spectroscopy. Interaction between UV-laser radiation and the thin film material was analyzed through ablation experiments. Finally, to investigate the electrochemical properties, the manufactured thin film cathodes were cycled against a lithium anode. The formation of a solid electrolyte interphase on the cathode side was discussed.

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“…Lithium manganese oxide has an inherent drawback in its unexpected phase transition from cubic spinel to tetragonal, which results from the known Jahn-Teller distortions [39]. The average valence state of Mn can be increased if a voltage of >3.54 V is applied, which leads to suppression of the Jahn-Teller distortion effect [40]. This result may indicate that the P4 thin film is electrochemically superior to the P9 thin film.…”

Section: Figure 5 Electrochemical Impedance Spectra (Eis) Patterns Of P4 and P9 And Equivalent Circuit (Inset)mentioning

confidence: 99%

“…A target was bombarded with He 2+ ions at MeV-energy (typically 1.6-3 MeV), and the energy of the backscattered projectiles at backscattering angles of ~170° was recorded with a solidstate Si detector. Data were fitted by computer simulation using the RUMP code, and the uncertainty in the RBS measurements is ~1%-5% [39][40][41]. The composition of P4 was characterized by RBS, and the results are shown in Figure 8a.…”

Section: Figure 5 Electrochemical Impedance Spectra (Eis) Patterns Of P4 and P9 And Equivalent Circuit (Inset)mentioning

confidence: 99%

Continuous Composition Spread and Electrochemical Studies of Low Cobalt Content Li(Ni,Mn,Co)O2 Cathode Materials

et al. 2019

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Many scientific efforts have been undertaken toward reducing the Co content in LiMn1/3Ni1/3Co1/3O2 cathode materials for thin-film batteries. In this study, we present cathodes with a wide range of Li(Ni, Mn, Co)O2 compositions to determine the material with the best electrochemical performance by changing the ratio of Ni to Mn at a fixed 0.1 at.% of Co by the continuous composition spread sputtering method. The cathode composition measurements by Rutherford backscattering spectroscopy show that the best electrochemical performance is obtained for a composition of Ni:Mn:Co = 19:71:10. The reasons for this improved electrochemical performance are further investigated by X-ray diffraction, electrochemical impedance spectroscopy, Fourier-transform infrared spectroscopy, and X-ray absorption near edge spectroscopy.

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Phase evolution and Sn-substitution in LiMn2O4 thin films prepared by pulsed laser deposition

Cited by 11 publications

References 20 publications

Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

Laser modification and characterization of Li-Mn-O thin film cathodes for lithium-ion batteries

Continuous Composition Spread and Electrochemical Studies of Low Cobalt Content Li(Ni,Mn,Co)O2 Cathode Materials

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