Deterioration mechanism of nickel metal-hydride batteries for hybrid electric vehicles

Shinyama, Katsuhiko; Magari, Yoshifumi; Kumagae, Kiyoshi; Nakamura, Hiroshi; Nohma, Toshiyuki; Takee, Masao; Ishiwa, Koji

doi:10.1016/j.jpowsour.2004.09.010

Cited by 34 publications

(16 citation statements)

References 11 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: 83%

“…Considerable amounts of Al (1 to 5 at%) were found in the cycled positive electrode which were the product of corrosion leaching out of negative electrode. This amount of Al is not sufficiently large to cause the irreversible β-to-g transformation of Ni(OH) 2 (source of positive electrode disintegration) [37]. Positive electrodes cycled using the C/2-C/2 scheme showed higher Al-contamination compared to those using the C-C scheme, due to the former's longer testing periods (longer duration and larger number of testing cycles).…”

Section: Failure Analysismentioning

confidence: 99%

“…The evolution trends of Co-and Zn-contents in the cycled positive electrode are opposite to that of Al ( Figure 20). Severe Al-contamination reduced the Zn and Co atom percentage in the composition of the positive electrode, which could eventually lead to the loss of the Co-conductive network and possibly the formation of a Zn-containing micro-short in the separator [37]. Although Al-contamination is not the main failure mechanism in this study, it can still degrade the cycle stability if oxidation of negative electrode is suppressed by the addition of surfactant binder in the negative electrode paste [38].…”

Section: Failure Analysismentioning

confidence: 99%

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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: 83%

Section: Failure Analysismentioning

confidence: 99%

Section: Failure Analysismentioning

confidence: 99%

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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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“…Li et al [18] applied the acrylic acid grafted polypropylene separator into the Ni-MH battery and analyzed the battery self-discharge mechanism. It is also found by the other researchers that a sulfonated polyolefin sheet can trap the nitrogen-containing impurities [19,20]. The rechargeable battery and its advancement are the key to the revolutionary change for further HEVs and PEVs' commercialization in the sustainable development for clean and efficient transportation needs.…”

Section: Introductionmentioning

confidence: 95%

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

Zhu

Tatarchuk

2014

International Journal of Hydrogen Energy

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Deterioration mechanism of nickel metal-hydride batteries for hybrid electric vehicles

Cited by 34 publications

References 11 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

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

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