A study on the effect of annealing treatment on the electrochemical properties of La0.67Mg0.33Ni2.5Co0.5 alloy electrodes

Pan, Hongge

doi:10.1016/s0360-3199(02)00035-6

Cited by 60 publications

(7 citation statements)

References 15 publications

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“…Negative electrodes were fabricated by compacting the alloy powder onto an expanded nickel substrate through a roll mill without any binder. Half-cell measurements were performed using a CTE MCL2 Mini cell testing Annealing has been used to effectively alter the phase components in the AB [38,39], AB 2 [40][41][42][43], AB 3 [44][45][46][47], A 2 B 7 [48][49][50][51], A 5 B 19 [52], AB 5 [53][54][55], A 8 B 21 [56,57], and body-centered-cubic (bcc) [58] MH alloys. According to first-principle calculations on superlattice MH alloy systems, the preferable phase abundance can be influenced by the starting composition and annealing condition [59,60].…”

Section: Methodsmentioning

confidence: 99%

Comparison among Constituent Phases in Superlattice Metal Hydride Alloys for Battery Applications

Kim

Ouchi²,

Nei³

et al. 2017

Batteries

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Abstract:The effects of seven constituent phases-CeNi 3 , NdNi 3 , Nd 2 Ni 7 , Pr 2 Ni 7 , Sm 5 Ni 19 , Nd 5 Co 19 , and CaCu 5 -on the gaseous phase and electrochemical characteristics of a superlattice metal hydride alloy made by induction melting with a composition of Sm 14 La 5.7 Mg 4.0 Ni 73 Al 3.3 were studied through a series of annealing experiments. With an increase in annealing temperature, the abundance of non-superlattice CaCu 5 phase first decreases and then increases, which is opposite to the phase abundance evolution of Nd 2 Ni 7 -the phase with the best electrochemical performance. The optimal annealing condition for the composition in this study is 920 • C for 5 h. Extensive correlation studies reveal that the A 2 B 7 phase demonstrates higher gaseous phase hydrogen storage and electrochemical discharge capacities and better battery performance in high-rate dischargeability, charge retention, and cycle life. Moreover, the hexagonal stacking structure is found to be more favorable than the rhombohedral structure.

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Section: Methodsmentioning

confidence: 99%

Comparison among Constituent Phases in Superlattice Metal Hydride Alloys for Battery Applications

Kim

Ouchi²,

Nei³

et al. 2017

Batteries

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“…The current density

I_{0}

which is generally used to describe the kinetics properties of the charge transfer reaction, is obtained by the following Equation 62,63 :

I_{0} = \frac{italicRT}{F} \frac{1}{{mR}_{ct}}

Where

T

F

m

R

and

R_{ct}

are the absolute temperature, the faraday constant (96,500 C mol −1 ), the effective mass of material, the gas constant and the charge‐transfer resistance. The calculated

I_{0}

of the LaGaO 3 oxide electrode is plotted in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical study of LaGaO₃ as novel electrode material of hydrogen battery (Ni/MH)

Tliha

Kaabi

Khaldi

et al. 2022

Env Prog and Sustain Energy

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The physico‐chemical performance of the novel anode LaGaO3 for Ni/MH accumulators was studied using the electrochemical impedance spectroscopy (EIS) method during cycling. The measured EIS data of the perovskite oxide are fitted according to the proposed equivalent circuit representing various processes involved in the mechanism of hydrogenation/dehydrogenation reactions of the oxide. Different kinetic elements such as current density I0, charge transfer resistance Rct, hydrogen transfer resistance Rht, double layer capacitance Cdl, and mass hydrogen diffusion Y0 were estimated under cycling. The EIS results relieved that current density I0 of the oxide increases quickly during the activation process and its maximum value is obtained at the second cycle (377.67 mA g−1). The degradation of the charge transfer rate of the oxide after activation can be ascribed to the corrosion of the electrode/electrolyte interface. The variation of the Warburg impedance Y0 could be attributed to the change in the morphological and the structure of the working electrode over cycling. The EIS analysis relieved that electrochemical behavior of the oxide is controlled by the charge‐transfer rate and the modification of the electrode surface.

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“…Potentiodynamic polarization technique was used to characterize the kinetic behavior of the working electrode after activation at different temperatures. The exchange current density ( I 0 ) and the polarization resistance ( R p ) are the effective parameters to estimate the electrocatalytic activity of the electrochemical reaction on the electrolyte/electrode interface . In Figure , experimental anodic Tafel curves for the LaGaO 3 working oxide are presented.…”

Section: Resultsmentioning

confidence: 99%

Effect of temperature on behavior of perovskite-type oxide LaGaO₃ used as a novel anode material for Ni-MH secondary batteries

et al. 2018

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Summary To obtain a novel negative electrode for nickel‐metal hydride rechargeable batteries, perovskite‐type oxide LaGaO3 was synthesized by the sol‐gel method. The electrochemical properties of the oxide were systematically investigated at different temperatures by using galvanostatic, chronoamperometric, and potentiodynamic polarization methods. We have selected 298, 313, and 328 K as room, intermediate, and high temperatures, respectively. The galvanostatic results showed that the discharge capacity of the oxide LaGaO3 increased with the temperature elevating during the first 3 cycles. This oxide has the highest discharge capacity of about 220 mAh g−1at high temperature. For room and intermediate temperatures, we observed that the discharge capacity maintains a constant about of 5 and 13 mAh g−1 for 298 and 313 K, respectively, when the number of cycles is increased. The electrochemical kinetic analysis indicates that the exchange current density and the hydrogen diffusion coefficient of the oxide LaGaO3 increase with the rise in temperature. The apparent activation energy (Ea) for hydrogen diffusion process and the activation energy (ΔrH*) for charge‐transfer reaction of the investigated oxide electrode LaGaO3 are estimated. The calculated values of the Ea and ΔrH* are 117.46 and 105 kJ mol−1, respectively. The above experimental results indicated that the kinetic properties of the working electrode have been significantly improved by the elevating of the temperature. The best electrochemical performance (faster activation and highest maximum capacity) of the oxide electrode is obtained at high temperature (328 K).

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A study on the effect of annealing treatment on the electrochemical properties of La0.67Mg0.33Ni2.5Co0.5 alloy electrodes

Cited by 60 publications

References 15 publications

Comparison among Constituent Phases in Superlattice Metal Hydride Alloys for Battery Applications

Comparison among Constituent Phases in Superlattice Metal Hydride Alloys for Battery Applications

Electrochemical study of LaGaO₃ as novel electrode material of hydrogen battery (Ni/MH)

Effect of temperature on behavior of perovskite-type oxide LaGaO₃ used as a novel anode material for Ni-MH secondary batteries

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A study on the effect of annealing treatment on the electrochemical properties of La0.67Mg0.33Ni2.5Co0.5 alloy electrodes

Cited by 60 publications

References 15 publications

Comparison among Constituent Phases in Superlattice Metal Hydride Alloys for Battery Applications

Comparison among Constituent Phases in Superlattice Metal Hydride Alloys for Battery Applications

Electrochemical study of LaGaO3 as novel electrode material of hydrogen battery (Ni/MH)

Effect of temperature on behavior of perovskite-type oxide LaGaO3 used as a novel anode material for Ni-MH secondary batteries

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Electrochemical study of LaGaO₃ as novel electrode material of hydrogen battery (Ni/MH)

Effect of temperature on behavior of perovskite-type oxide LaGaO₃ used as a novel anode material for Ni-MH secondary batteries