Two-dimensional and quasi-two-dimensional isotherms for Li intercalation and upd processes at surfaces

Conway, B. E.

doi:10.1016/0013-4686(93)80055-5

Cited by 108 publications

(83 citation statements)

References 20 publications

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“…The small capacitance fading in the first 150 cycles perhaps originates from the “active” sites saturation on the surface of MoS 2 film during the charge‐discharge process, and the later capacitance increase should be attributed to the “intercalation” induced capacitance behavior caused by the intercalation of foreign ions (Na + ) into van der Waals gaps of multilayers of MoS 2 . This phenomenon is similar to the one reported for most layered transition metal oxides (such as TiS 2 , TiO 2 (B), MoO 3 etc) applied in energy storage 3, 26–28…”

Section: Resultssupporting

confidence: 87%

Direct Laser‐Patterned Micro‐Supercapacitors from Paintable MoS₂ Films

Cao

Yang

Gao

et al. 2013

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481

385

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Micrometer-sized electrochemical capacitors have recently attracted attention due to their possible applications in micro-electronic devices. Here, a new approach to large-scale fabrication of high-capacitance, two-dimensional MoS2 film-based micro-supercapacitors is demonstrated via simple and low-cost spray painting of MoS2 nanosheets on Si/SiO2 chip and subsequent laser patterning. The obtained micro-supercapacitors are well defined by ten interdigitated electrodes (five electrodes per polarity) with 4.5 mm length, 820 μm wide for each electrode, 200 μm spacing between two electrodes and the thickness of electrode is ∼0.45 μm. The optimum MoS2 -based micro-supercapacitor exhibits excellent electrochemical performance for energy storage with aqueous electrolytes, with a high area capacitance of 8 mF cm(-2) (volumetric capacitance of 178 F cm(-3) ) and excellent cyclic performance, superior to reported graphene-based micro-supercapacitors. This strategy could provide a good opportunity to develop various micro-/nanosized energy storage devices to satisfy the requirements of portable, flexible, and transparent micro-electronic devices.

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Section: Resultssupporting

confidence: 87%

Direct Laser‐Patterned Micro‐Supercapacitors from Paintable MoS₂ Films

Cao

Yang

Gao

et al. 2013

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481

385

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“…In this paper, we concentrate on the intercalation of Li into Li 1Ϫx CoO 2 where 0.75 < 1 Ϫ x < 1 (0 < x < 0. 25 insertion with strong attractive interactions and first-order phase transition involving intrinsic hysteresis between the insertion and deinsertion processes, D, the effective diffusion coefficient calculated, is not defined at the intercalation levels (and the potential) along the unstable branch of the intercalation isotherm (i.e., in the vicinity of x ϭ 0.5 in Eq. 21).…”

Section: Comments On the Nature Of The Phase Transition In LI 1ϫx Coomentioning

confidence: 99%

Solid‐State Electrochemical Kinetics of Li‐Ion Intercalation into Li1 − x CoO2: Simultaneous Application of Electroanalytical Techniques SSCV, PITT, and EIS

Levi

Salitra

Markovsky

et al. 1999

J. Electrochem. Soc.

620

354

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The electroanalytical behavior of thin Li1−xCoO2 electrodes is elucidated by the simultaneous application of three electroanalytical techniques: slow‐scan‐rate cyclic voltammetry (SSCV), potentiostatic intermittent titration technique, and electrochemical impedance spectroscopy. The data were treated within the framework of a simple model expressed by a Frumkin‐type sorption isotherm. The experimental SSCV curves were well described by an equation combining such an isotherm with the Butler‐Volmer equation for slow interfacial Li‐ion transfer. The apparent attraction constant was −4.2, which is characteristic of a quasi‐equilibrium, first‐order phase transition. Impedance spectra reflected a process with the following steps: Li+ ion migration in solution, Li+ ion migration through surface films, strongly potential‐dependent charge‐transfer resistance, solid‐state Li+ diffusion, and accumulation of the intercalants into the host materials. An excellent fit was found between these spectra and an equivalent circuit, including a Voigt‐type analog ( Li+ migration through multilayer surface films and charge transfer) in series with a finite‐length Warburg‐type element ( Li+ solid‐state diffusion), and a capacitor (Li accumulation). In this paper, we compare the solid‐state diffusion time constants and the differential intercalation capacities obtained by the three electroanalytical techniques. © 1999 The Electrochemical Society. All rights reserved.

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“…12,13 One such compound, LiMn 0.33 Ni 0.33 Co 0. 33 O 2 , has been investigated extensively and is a leading candidate for the positive-electrode active material in lithium-ion batteries for transportation applications. 14,15 In this paper we describe the morphology, structure, and electrochemical behavior of oxides prepared by partial substitution of nickel and manganese in LiMn 0.5 Ni 0.5 O 2 by chromium.…”

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confidence: 99%

Morphology, Structure, and Electrochemistry of Solution-Derived LiMn[sub 0.5−x]Cr[sub 2x]Ni[sub 0.5−x]O[sub 2] for Lithium-Ion Cells

Karan

Abraham

Balasubramanian

et al. 2009

J. Electrochem. Soc.

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In recent years LiMn 0.5 Ni 0.5 O 2 has emerged as a promising alternative to LiCoO 2 because of its lower cost, better high voltage stability, and improved thermal abuse characteristics. In this paper we report on Li͓Mn 0.5−x Cr 2x Ni 0.5−x ͔O 2 ͑0 ഛ 2x ഛ 0.2͒ compounds, which is formed by the partial substitution of nickel and manganese in LiMn 0.5 Ni 0.5 O 2 by chromium. The Li͓Mn 0.5−x Cr 2x Ni 0.5−x ͔O 2 particles, prepared by a chemical solution route, displayed a faceted morphology, with particle size increasing with increasing chromium content. Rietveld refinement of X-ray diffraction data from the oxides showed that the c lattice parameter of the layered ␣-NaFeO 2 -type structure increased, and lithium/nickel intermixing decreased, with increasing chromium content. Electrochemical cycling in the 3-4.3 V voltage window indicated that the discharge capacity was highest for the 2x = 0.05 oxide composition. Charge and discharge capacities decreased with increasing chromium content for electrodes cycled in the 3-4.8 V range, and cells containing the higher chromium content oxides showed significant polarization. Peaks corresponding to oxygen loss were observed in dQ/dV plots of cells containing the 2x = 0, 0.05, and 0.1 oxides, but not for the 2x = 0.2 oxide. The first cycle "irreversible" capacity observed for cells cycled up to 145 mAh/g capacity was recovered by deep-discharging the cells to voltages below 1.5 V. Oxidation state and local structural analysis of X-ray absorption spectroscopy data from the deep-discharged and as-prepared samples showed remarkable similarity, which indicated that the deep-discharge allowed the sample to almost regain its original state. Significant capacity loss was observed during electrochemical cycling, especially for the high chromium containing oxides, which appears to result from rate limitations induced by the coupling of lithium diffusion and chromium migration to and from the tetrahedral sites during the charge-discharge cycles.The use of rechargeable lithium-ion batteries for consumer electronic applications has increased dramatically ever since Sony Corp. introduced the first commercial cell in 1990. The search for alternative positive-electrode materials that are cheaper, safer, and more environmentally benign than the currently used LiCoO 2 is an active area of research in the rechargeable lithium-ion battery community. Among the various manganese-based materials being considered, a substantial amount of research has been done on manganese-based spinel, LiMn 2 O 4 , systems. 1,2 Although this material has excellent structural stability upon lithium cycling at ambient temperatures, its moderate capacity ͑ϳ120 mAh/g͒ and severe capacity fade at elevated temperatures ͑ϳ50°C͒ make it less appealing for practical applications. LiMnO 2 has also been examined as a potential alternative to LiCoO 2 . However, the thermodynamically stable phase with the composition LiMnO 2 crystallizes with an orthorhombic structure ͑space group Pmmn͒ and not with the rhombohedral structur...

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Two-dimensional and quasi-two-dimensional isotherms for Li intercalation and upd processes at surfaces

Cited by 108 publications

References 20 publications

Direct Laser‐Patterned Micro‐Supercapacitors from Paintable MoS₂ Films

Direct Laser‐Patterned Micro‐Supercapacitors from Paintable MoS₂ Films

Solid‐State Electrochemical Kinetics of Li‐Ion Intercalation into Li1 − x CoO2: Simultaneous Application of Electroanalytical Techniques SSCV, PITT, and EIS

Morphology, Structure, and Electrochemistry of Solution-Derived LiMn[sub 0.5−x]Cr[sub 2x]Ni[sub 0.5−x]O[sub 2] for Lithium-Ion Cells

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Two-dimensional and quasi-two-dimensional isotherms for Li intercalation and upd processes at surfaces

Cited by 108 publications

References 20 publications

Direct Laser‐Patterned Micro‐Supercapacitors from Paintable MoS2 Films

Direct Laser‐Patterned Micro‐Supercapacitors from Paintable MoS2 Films

Solid‐State Electrochemical Kinetics of Li‐Ion Intercalation into Li1 − x CoO2: Simultaneous Application of Electroanalytical Techniques SSCV, PITT, and EIS

Morphology, Structure, and Electrochemistry of Solution-Derived LiMn[sub 0.5−x]Cr[sub 2x]Ni[sub 0.5−x]O[sub 2] for Lithium-Ion Cells

Contact Info

Product

Resources

About

Direct Laser‐Patterned Micro‐Supercapacitors from Paintable MoS₂ Films

Direct Laser‐Patterned Micro‐Supercapacitors from Paintable MoS₂ Films