Talk:Nickel–hydrogen battery

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Why does this redirect to Sanyo? I don't think they're the only company that makes these types of batteries. This page (NASA) lists a company called Eagle-Picher Industries, Inc. as also making this type of battery, so this redirect should probably be changed. --67.70.123.116 (talk) 15:08, 4 October 2008 (UTC)

"Discharge voltage" v. "voltage under load"

Seems to me to be the same characteristic. Should it read "discharge voltage 1.25-1.5 volts"? Jim1138 (talk) 21:10, 26 April 2011 (UTC)

(months later) There's the open circuit voltage when fully charged, there's the average discharge voltage while delivering load, and there's the end=-point dishcharge voltage beyond which little useful capacity is available. (There's also charging voltage which can be higher than the open-circuit voltage). I've adjusted this to match what the reference was saying. --Wtshymanski (talk) 14:50, 23 March 2012 (UTC)

Dependent pressure vessel?

OK, individual PV cells have only one set of +/- plates in a bottle, common PV has two sets of plates, and a single pressure vessel design has all the plates of a stack (many sets of +/- cells) in one bottle. So what's a "dependent pressure vessel" ? The abstract snippets used as citations are perfectly opaque if you don't already know what a "dependent pressure vessel" battery looks like. This is the drawback with using NASA research paper snippets or graduate theses as references, instead of a more broad-based overview reference such as the Linden book, which, sadly, doesn't describe these developments. Do any of the diagrams show this? --Wtshymanski (talk) 14:50, 23 March 2012 (UTC)

Dubious claim

There is a sentence in the article which reads

"If the cell is over-charged, the oxygen produced at the nickel electrode reacts with the hydrogen present in the cell and forms water; as a consequence the cells can withstand overcharging as long as the heat generated can be dissipated."

If this is correct, then there is a limit to the amount of overcharging. It is constrained by the point at which all the available hydrogen has been turned into water. I B Wright (talk) 18:34, 17 December 2013 (UTC)

This is incorrect, both hydrogen and oxygen are generated during overcharge and will recombine indefinitely via catalyzation by platinum in the anode. There is no reason that this should be considered dubious, at least not by your explanation.

The first ext link: *Overview of the design, development, and application of nickel-hydrogen batteries cells are normally overcharged about 4%. I did not see anything on overcharge reversal. "An inappropriate charge-control method that uses an excessive amount of overcharge or allows the cell to experience an excessively high end-of-charge voltage will shorten the mission life of an otherwise good cell and battery design. Although most nickel-hydrogen cell designs can tolerate significant amounts of overcharge for a few cycles without catastrophic damage, overcharge has historically been one of the major causes for the accumulation of damage in cells leading to premature failure. Thus, the major charge-control issue is returning sufficient recharge to maintain all cells in a battery at an acceptable state of charge, while limiting overcharge stresses to the minimum possible level.". A bit of overcharge is OK, excessive overcharge will shorten life. Jim1138 (talk) 08:34, 18 December 2013 (UTC)

Inventors

The patent lists at least three (3) inventors: Alexandr Ilich Kloss, Vyacheslav Mikhailovic Sergeev, and Boris Ioselevich Tsenter; but only two inventors are mentioned in this article. There seems to be a tug of war between one reviewer and Dr. Tsenter (who wants to remove brackets around the two listed names because there currently are no Wikipedia articles about them; perhaps an earlier Wikipedian decided to delete the two articles, as so sadly is frequently the case in Wikipedia). Because there is no Wikipedia article for either inventor mentioned, Dr. Tsenter's mobile edits should stand, but all three inventors should be listed and the order of the inventors listed should that shown on the patent itself. MaynardClark (talk) 08:32, 27 December 2015 (UTC)

Research on energy density and cost improvements

Hi, I found this recent article , https://doi.org/10.1073/pnas.1809344115 , https://www.pnas.org/content/115/46/11694 from 2018, "Nickel-hydrogen batteries for large-scale energy storage", that does use different catalyst, which is cheaper, and different electrolyte, which is wet solution of base. It brings the cost to 85$/kWh (estimates), which is way below the current cheapest grid scale lithium-ion type batteries (not sure if it is cheaper with Vanadium redox flow batteries, or Zinc-bromide flow batteries), and energy density of 140 Wh/kg, which is twice of usual energy density associated with Nickle-hydrogen batteries. The Columbic efficiency of 98.5% and very long life (no visible capacity degradation after 1500 cycles, indicating it can last 30000 cycles or more). Figure 4 shows the cycling performance, and how much better it is than using Platinum for catalyst. I guess it might be worth mentioning in the article somehow. 2A02:168:F609:0:7782:D6E:7978:DAF0 (talk) 20:38, 31 July 2019 (UTC)