Mechanism of rapid degradation of nanostructured Mg2Ni hydrogen storage alloy electrode synthesized by mechanical alloying and the effect of mechanically coating with nickel

Goo, Nam Hoon; Woo, Jung Hoon; Lee, Kyung Sub

doi:10.1016/s0925-8388(99)00100-0

Cited by 74 publications

(35 citation statements)

References 12 publications

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“…The bulk electrode had a one-plateau potential (-0.8 V) and lost 80% of its maximum capacity within 10 cycles [20][21][22]. And also, it has been reported that the degradation mechanism is related with the oxidation of magnesium [15,22]. The magnesium oxide layer did not cause a significant loss of hydrogen storage capacity, but prevented the hydrogen transfer at the surface and hydrogen diffusion through the surface [15].…”

Section: Resultsmentioning

confidence: 95%

“…The experimental condition was similar with the bulk Mg 2 Ni type electrode except for using an Mg 0.9 Ni 0.1 based thin film. Many papers have been published on the bulk Mg 2 Ni based electrode [20][21][22]. The bulk electrode had a one-plateau potential (-0.8 V) and lost 80% of its maximum capacity within 10 cycles [20][21][22].…”

Section: Resultsmentioning

confidence: 99%

“…Many papers have been published on the bulk Mg 2 Ni based electrode [20][21][22]. The bulk electrode had a one-plateau potential (-0.8 V) and lost 80% of its maximum capacity within 10 cycles [20][21][22]. And also, it has been reported that the degradation mechanism is related with the oxidation of magnesium [15,22].…”

Section: Resultsmentioning

confidence: 99%

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A study on the electrochemical properties of an Mg−Ni based thin film electrode for a microbattery

et al. 2001

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In order to investigate the possibility of a microbattery using an Mg 2 Ni type alloy, we have studied the electrochemical properties of the Mg 1-x Ni x (x=0.33, 0.15, 0.10) thin film electrode. The thin films were prepared by DC magnetron co-sputtering using Mg and Ni targets and had an amorphous structure. The discharge capacities of the Mg 1-x Ni x (x=0.33, 0.15, 0.10) films increased as the Mg content increased, that of the Mg 0.9 Ni 0.1 electrode increased with repeated charge-discharge cycles reached the maximum value, 228 mAh/g, after 10 cycles. The surface morphology of the film was changed to a needle-type porous structure by cycling.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

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A study on the electrochemical properties of an Mg−Ni based thin film electrode for a microbattery

et al. 2001

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“…Therefore Mg from the Mg2Ni phase reacts with the OH-ion from the electrolyte to form a passive Mg(OH)2 layer for hydriding and dehydriding. The Mg(OH)2 is irreversible compared to Ni(OH)> Ni(OH)2 can be converted to nickel during charging process [7][8][9][10][11].…”

Section: Degradation In Mg~ni/ni(oh)2electrodesmentioning

confidence: 99%

Degradation in polymer Ni-MH battery

Mohamad

2005

Ionics

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Abstract. The alkaline solid polymer electrolyte system with the conductivity of (8.5 -0.2) x 104 Scm -~ composes of polyvinyl alcohol (PVA) and potassium hydroxide (KOH) have been used in fabrication of Mg2Ni/Ni(OH)2 nickel metal hydride cell. The self-dehydriding of the cell during storage was presented by open circuit voltage study. Cell degradation after charge-discharge cycling is characterized by means of X-ray diffraction and scanning electron microscopic analyses. The failure of the cell can be ascribed by a small formation of Mg(OH)2 oxide layer and surface resistance between electrode-electrolyte.

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“…One of its key applications is the rechargeable nickel/metal hydride (Ni/MH) battery, which is used widely in consumer electronics, as well as stationary and transportation energy storage areas. A large variety of IMCs have been used/proposed as the active materials in the negative electrode of Ni/MH battery, such as A 2 B [2], AB [3,4], AB 2 [5], AB 3 [6], A 2 B 7 [7], A 5 B 19 [8], AB 5 [9], body-centered-cubic (BCC) solid solution [10], and their combinations [11,12]. These IMCs are composed of mostly transition metals (TM), and some may contain rare-earth (RE) elements.…”

Section: Introductionmentioning

confidence: 99%

Effects of Alkaline Pre-Etching to Metal Hydride Alloys

Meng¹,

Kim

Hu³

et al. 2017

Batteries

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Abstract:The responses of one AB 5 , two AB 2 , four A 2 B 7 , and one C14-related body-centered-cubic (BCC) metal hydrides to an alkaline-etch (45% KOH at 110 • C for 2 h) were studied by internal resistance, X-ray diffraction, scanning electron microscope, inductively coupled plasma, and AC impedance measurements. Results show that while the etched rare earth-based AB 5 and A 2 B 7 alloys surfaces are covered with hydroxide/oxide (weight gain), the transition metal-based AB 2 and BCC-C14 alloys surfaces are corroded and leach into electrolyte (weight loss). The C14-predominated AB 2 , La-only A 2 B 7 , and Sm-based A 2 B 7 showed the most reduction in the internal resistance with the alkaline-etch process. Etched A 2 B 7 alloys with high La-contents exhibited the lowest internal resistance and are suggested for use in the high-power application of nickel/metal hydride batteries.

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Mechanism of rapid degradation of nanostructured Mg2Ni hydrogen storage alloy electrode synthesized by mechanical alloying and the effect of mechanically coating with nickel

Cited by 74 publications

References 12 publications

A study on the electrochemical properties of an Mg−Ni based thin film electrode for a microbattery

A study on the electrochemical properties of an Mg−Ni based thin film electrode for a microbattery

Degradation in polymer Ni-MH battery

Effects of Alkaline Pre-Etching to Metal Hydride Alloys

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