Performance Comparison between AB5 and Superlattice Metal Hydride Alloys in Sealed Cells

Koch, J.; Kim, Young; Nei, Jean; Hu, Chaolan; Reichman, B.

doi:10.3390/batteries3040035

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…The specific power (P) was estimated by using formula: (E, F, and G) show lower R than that of the standard AB 5 (A) after KOH-etching. The as-prepared (no etch) E and G show even lower R than that from A and have been used in the high-power design of Ni/MH batteries [41,44]. Overall, G shows the lowest R and the highest estimated specific power of 390 W·kg -1 , which is considerably higher than that from the standard A (317 W·kg -1 ).…”

Section: Electrochemical Resultsmentioning

confidence: 96%

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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Section: Electrochemical Resultsmentioning

confidence: 96%

Effects of Alkaline Pre-Etching to Metal Hydride Alloys

Meng¹,

Kim

Hu³

et al. 2017

Batteries

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“…In the C-size cell, performances of AB 2 (between C14 and C15) [27], a Fe-free [28] and a Fe-doped [29] superlattice MH alloys were measured, and that results can be summarized as follows: C15-based MH alloy was more suitable for high-rate application comparing to those from C14 alloy and confirm previous half-cell results [16], superlattice alloy showed better high-rate and low-temperature performances comparing to those of AB 5 MH alloy, and Fe in the superlattice alloy can extend the cycle life by preventing Al-leaching from the negative electrode. In the newly developed pouch type cell, the high-capacity core-shell Ni(OH) 2 was compared to the conventional single-phase Ni(OH) 2 , and lower impedance and better charge retention were observed [30].…”

Section: Cell Performance Comparisonmentioning

confidence: 99%

Research in Nickel/Metal Hydride Batteries 2017

Kim

2018

Batteries

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“…These stacking structures are expected to take advantage of the properties of the AB2 compounds which have a larger sorption capacity [16] though lower crystalline stability [17], whereas the AB5 compounds have lower capacities, but improved cycling stability. Indeed, several studies attest for the better performance of these types of materials used as anodes in alkaline batteries [18,19]. However, ABy binary compounds often exhibit complex properties combining multiplateau isotherms curves, large hysteresis, and poor reversibility related to amorphization upon cycling.…”

Section: Introductionmentioning

confidence: 99%

Investigation of H Sorption and Corrosion Properties of Sm2MnxNi7−x (0 ≤ x < 0.5) Intermetallic Compounds Forming Reversible Hydrides

et al. 2020

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Intermetallic compounds are key materials for energy transition as they form reversible hydrides that can be used for solid state hydrogen storage or as anodes in batteries. ABy compounds (A = Rare Earth (RE); B = transition metal; 2 < y < 5) are good candidates to fulfill the required properties for practical applications. They can be described as stacking of [AB5] and [AB2] sub-units along the c crystallographic axis. The latter sub-unit brings a larger capacity, while the former one provides a better cycling stability. However, ABy binaries do not show good enough properties for applications. Upon hydrogenation, they exhibit multiplateau behavior and poor reversibility, attributed to H-induced amorphization. These drawbacks can be overcome by chemical substitutions on the A and/or the B sites leading to stabilized reversible hydrides. The present work focuses on the pseudo-binary Sm2MnxNi7−x system (0 ≤ x < 0.5). The structural, thermodynamic and corrosion properties are analyzed and interpreted by means of X-ray diffraction, chemical analysis, scanning electron microscopy, thermogravimetric analysis and magnetic measurements. Unexpected cell parameter variations are reported and interpreted regarding possible formation of structural defects and uneven Mn distribution within the Ni sublattice. Reversible capacity is improved for x > 0.3 leading to larger and flatter isotherm curves, allowing for reversible capacity >1.4 wt %. Regarding corrosion, the binary compound corrodes in alkaline medium to form rare earth hydroxide and nanoporous nickel. As for the Mn-substituted compounds, a new corrosion product is formed in addition to those above mentioned, as manganese initiates a sacrificial anode mechanism taking place at the early corrosion stage.

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Performance Comparison between AB5 and Superlattice Metal Hydride Alloys in Sealed Cells

Cited by 9 publications

References 29 publications

Effects of Alkaline Pre-Etching to Metal Hydride Alloys

Effects of Alkaline Pre-Etching to Metal Hydride Alloys

Research in Nickel/Metal Hydride Batteries 2017

Investigation of H Sorption and Corrosion Properties of Sm2MnxNi7−x (0 ≤ x < 0.5) Intermetallic Compounds Forming Reversible Hydrides

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