Electrochemical investigation of CrO2.65 doped LiMn2O4 as a cathode material for lithium-ion batteries

Zhang, D.; Popov, Branko N.; White, Ralph E.

doi:10.1016/s0378-7753(98)00143-8

Cited by 138 publications

(68 citation statements)

References 40 publications

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“…8b and 9. The impedance spectra of the LiMn 2 O 4 are similar to those observed by others, 18,22,38,43 which reflects the Li ion migration through the surface film (high-to-medium frequency semicircle; 0.35 MHz-8 kHz), charge transfer at the interface coupled with the double layer capacitance (medium frequency; 8 kHz-10 Hz) and a Warburg contribution that reflects Li ion migration through the bulk of the material (0.2 Hz-3 mHz). The third semicircle at the low frequency side (10 Hz-0.2 Hz) , which is pronounced only in doped spinels was not, however, seen by others.…”

Section: Eissupporting

confidence: 86%

Li ion kinetic studies on spinel cathodes, Li(M1/6Mn11/6)O4 (M = Mn, Co, CoAl) by GITT and EIS

2002

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Pristine and substituted spinels, Li(M 1/6 Mn 11/6 )O 4 (M~Co 1/6 , Co 1/12 Al 1/12 ) were prepared and their cathodic performance up to 80 cycles at ambient temperature and at 50 uC and the Li ion kinetic parameters obtained by galvanostatic intermittent titration technique (GITT) at ambient temperature and 50 uC and electrochemical impedance spectroscopy (EIS) at ambient temperature up to 80 cycles were compared to understand the improved performance observed for the doped spinels. The apparent Li diffusion coefficient (D Li ) obtained from GITT in the voltage range of operation of the cell (3.5-4.3 V vs. Li) at ambient temperature and 50 uC is in the range 1 6 10 29 -10 210 cm 2 s 21 for M~Mn, Co and (Co,Al). The D Li vs. voltage plots show indication of suppression of two-phase formation in doped spinels. Distinct changes in the EIS-derived parameters and the D Li values in the compounds with M~Co, (Co,Al) as compared to LiMn 2 O 4 lead to the conclusion that the observed cycling stability in the doped spinels is contributed by the Li ion kinetics in addition to the suppression of the structural changes and associated material dissolution.

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Section: Eissupporting

confidence: 86%

Li ion kinetic studies on spinel cathodes, Li(M1/6Mn11/6)O4 (M = Mn, Co, CoAl) by GITT and EIS

2002

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“…10 becomes [23] where y| xϭ1 ϭ c s /c t and [24] which is a dimensionless parameter denoting the ratio of the diffusional resistance (r 0 /D) to the interfacial kinetic resistance {1/(kc l 1Ϫ␤ )}, involving the Li ϩ concentration in the liquid phase. Under potentiodynamic stimulus, the applied potential changes linearly with time, and can be expressed by where U app is the applied potential, U 0 is the initial applied potential, which we assign to be the same as the initial open-circuit potential and is further discussed below.…”

Section: Initial Conditionmentioning

confidence: 99%

“…Equation 24 gives the mathematical expression for this parameter. Larger a means faster interfacial charge-transfer kinetics when the diffusion coefficient is fixed.…”

Section: Cyclic Voltammograms For Various Scan Rates V-mentioning

confidence: 99%

Modeling Lithium Intercalation of a Single Spinel Particle under Potentiodynamic Control

Zhang

Popov

White

2000

J. Electrochem. Soc.

177

118

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A mathematical model is presented for the lithium intercalation of a single spinel particle as a microelectrode under the stimulus of a cyclic linear potential sweep. The model includes both lithium diffusion within the particle and kinetics at the particle/electrolyte interface. The model is used to predict that peak current densities depend linearly on the scan rate to a certain power with a constant term, which is different from the predicted peak current density for a conventional redox system.

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“…Both the solubility and the molecular size are related to their chemical diffusion coefficient. Diffusion coefficient is used to represent the active degree of the movement and is crucial for determining the reaction rate [26]. Compared with other electron mediators, MV and NQ have smaller molecular size, and better solubility, which lead to a higher chemical diffusion coefficient.…”

Section: Effects Of Doping With Different Electron Mediators On Dgafcmentioning

confidence: 99%

The Performance of Electron-Mediator Modified Activated Carbon as Anode for Direct Glucose Alkaline Fuel Cell

Liu

et al. 2016

Catalysts

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Abstract:Six different electron mediators were immobilized on the activated carbon (AC) anode and their effects on performance of a direct glucose alkaline fuel cell were explored. 2-hydroxy-1, 4-naphthoquinone (NQ), methyl viologen (MV), neutral red (NR), methylene blue (MB), 1, 5-dichloroanthraquinone (DA) and anthraquinone (AQ) were doped in activated carbon (AC), respectively, and pressed on nickel foam to fabricate the anodes. NQ shows comparable performance with MV, but with much lower cost and environmental impact. With NQ-AC anode, the fuel cell attained a peak power density of 16.10 Wm´2, peak current density of 48.09 Am´2, and open circuit voltage of 0.76 V under the condition of 1 M glucose, 3 M KOH, and ambient temperature. Polarization curve, EIS and Tafel measurements were also conducted to explore the mechanism of performance enhancement. The high performance is likely due to the enhanced charge transfer and more reactive sites provided on the anode.

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Electrochemical investigation of CrO2.65 doped LiMn2O4 as a cathode material for lithium-ion batteries

Cited by 138 publications

References 40 publications

Li ion kinetic studies on spinel cathodes, Li(M1/6Mn11/6)O4 (M = Mn, Co, CoAl) by GITT and EIS

Li ion kinetic studies on spinel cathodes, Li(M1/6Mn11/6)O4 (M = Mn, Co, CoAl) by GITT and EIS

Modeling Lithium Intercalation of a Single Spinel Particle under Potentiodynamic Control

The Performance of Electron-Mediator Modified Activated Carbon as Anode for Direct Glucose Alkaline Fuel Cell

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