Self-discharge characteristics and performance degradation of Ni-MH batteries for storage applications

Zhu, Wenxin; Zhu, Ying; Tatarchuk, Bruce J.

doi:10.1016/j.ijhydene.2014.09.113

Cited by 52 publications

(23 citation statements)

References 28 publications

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“…All particles trapped in this region contain mainly Ni and some rare earth elements. This is significantly different from most of the debris containing high Mn and Zn-content observed in other Mn-containing MH alloys [20,30,37,39]. In this study, fine particles broke off from the negative electrode and did not form a micro-short conducting path.…”

Section: Failure Analysiscontrasting

confidence: 82%

Properties of Nickel Metal Hydride Battery Using Molybdenum-added Superlattice Metal Hydride Alloy

Kim¹

2018

Mater. Sci. Eng. Adv. Res

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The performance of sealed cells comprising of a series of superlattice metal hydride (MH) alloys with compositions of Mm 0.83 Mg 0.17 Ni 2.94-x Al 0.17 Co 0.20 Mo x (Mm is a mixture of La, Pr, and Nd, x = 0.00, 0.05, 0.10, 0.15, and 0.20) was evaluated and compared against other substitutional elements, such as Fe, Mn, and Co. The capacities of cells with Mo-containing alloys are higher than the ones using Mo-free alloy due to the former's higher active material utilization in positive electrodes. Cells with alloy of x = 0.10 showed the highest capacity and high-rate dischargeability, the best low-temperature (−10 and −20 °C), and the longest cycle performance (C-rates charge and discharge). This level of Mo (x = 0.10) is effective in protecting the alloy surface from oxidation. The main failure mechanism of the sudden capacity drop for cells in this study is the venting of gas/ electrolyte mixture from the build-up of internal pressure; this is caused by a dense surface oxide layer formed on the MH alloy blocking the path for gas-recombination during overcharge.

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Section: Failure Analysiscontrasting

confidence: 82%

Properties of Nickel Metal Hydride Battery Using Molybdenum-added Superlattice Metal Hydride Alloy

Kim¹

2018

Mater. Sci. Eng. Adv. Res

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“…A significant number of high Mn-content deposits are found in both cells. These Mn-rich deposits are the source of micro-shortening, due to their semiconductor nature [20,21], and cause a relatively inferior charge retention performance when compared to that of cell C14. The density of these Mn-rich oxides in the cycled C15 cell is higher than that in cell C15A and may explain the worse charge retention result of cell C15, when compared to cell C15A.…”

Section: Failure Analysis Of C15 and C15amentioning

confidence: 99%

Cell Performance Comparison between C14- and C15-Predomiated AB2 Metal Hydride Alloys

Kim

Koch²,

Wan

et al. 2017

Batteries

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Abstract:The performance of cylindrical cells made from negative electrode active materials of two selected AB 2 metal hydride chemistries with different dominating Laves phases (C14 vs. C15) were compared. Cells made from Alloy C15 showed a higher high-rate performance and peak power with a corresponding sacrifice in capacity, low-temperature performance, charge retention, and cycle life when compared with the C14 counterpart (Alloy C14). Annealing of the Alloy C15 eliminated the ZrNi secondary phase and further improved the high-rate and peak power performance. This treatment on Alloy C15 showed the best low-temperature performance, but also contributed to a less-desirable high-temperature voltage stand and an inferior cycle stability. While the main failure mode for Alloy C14 in the sealed cell is the formation of a thick oxide layer that prevents gas recombination during overcharge and consequent venting of the cell, the failure mode for Alloy C15 is dominated by continuous pulverization related to the volumetric changes during hydride formation and hysteresis in the pressure-composition-temperature isotherm. The leached-out Mn from Alloy C15 formed a high density of oxide deposits in the separator, leading to a deterioration in charge retention performance. Large amounts of Zr were found in the positive electrode of the cycled cell containing Alloy C15, but did not appear to harm cell performance. Suggestions for further composition and process optimization for Alloy C15 are also provided.

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“…It is also necessary to estimate the remaining useful life (RUL) of the used batteries by determining the number of cycles that the used battery can sustain before it fails in achieving the demanded performance [14]. Hence, a degradation test must be performed on the investigated batteries.…”

Section: Parametermentioning

confidence: 99%

Optimized modeling of Ni-MH batteries primarily based on Taguchi approach and evaluation of used Ni-MH batteries

Muhsen¹,

Almuhtady²

2019

Turk J Elec Eng & Comp Sci

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This paper aims to generate an optimized model of the Ni-MH battery based on the Taguchi method and it further aims to evaluate used Ni-MH batteries that served in hybrid electric vehicles and electric vehicles. The status of twelve used Ni-MH batteries is studied to determine their usefulness after their life cycle in automotive applications.The status of used batteries is evaluated by investigating their state of charge, remaining useful life, and degradation in performance. Accordingly, the tested batteries are classified into four categories and they are proposed to serve in different applications. The novelty of the work lies in modeling used Ni-MH hybrid batteries by extracting a model that can define and calculate the battery voltage during the discharging phase, and it can study the influence of design parameters under certain conditions regardless of whether the battery is brand-new or used. Therefore, a second-order model is used to represent the used battery where an explicit mathematical formula expresses the discharge voltage of the new Ni-MH battery at different discharge pulse times, optimized later utilizing the Taguchi optimization method.Finally, the discharge voltage obtained using the developed model for different batteries is benchmarked against the actual measured discharge voltage by calculating the root mean square error.

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Self-discharge characteristics and performance degradation of Ni-MH batteries for storage applications

Cited by 52 publications

References 28 publications

Properties of Nickel Metal Hydride Battery Using Molybdenum-added Superlattice Metal Hydride Alloy

Properties of Nickel Metal Hydride Battery Using Molybdenum-added Superlattice Metal Hydride Alloy

Cell Performance Comparison between C14- and C15-Predomiated AB2 Metal Hydride Alloys

Optimized modeling of Ni-MH batteries primarily based on Taguchi approach and evaluation of used Ni-MH batteries

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