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New nickel-iron battery charges in seconds, survives 12,000 cycles (interestingengineering.com)
submitted 8 months ago by to c/technology@lemmy.world
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[–] 13 points 8 months ago (9 children)

the device achieves an excellent specific energy (47 W h kg−1) and superior specific power (18 kW kg−1)

I'm not familiar with this stuff. How does that compare to popular lithium batteries?

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  • [–] 10 points 8 months ago*

    Most li-ions land around 120-160 W-h /kg. So much poorer, but much cheaper on density

    The specific power (power density) is kind of crazy though. I think most li-ions top out around 10kW/kg, any more and they will overheat and boil their electrolyte which usually leads to fire.

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  • [–] 14 points 8 months ago* (4 children)

    Poorly. According to a random Wikipedia query, commodity lithium ion is ~270 Wh per kilogram. So this is around 20% of that, according to the above.

    "Excellent" may be in comparison to other byzantine specialty battery chemistries, but lithium ion remains resolutely enthroned.

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  • [–] 8 points 8 months ago

    Nickel iron is typically used for off grid solar energy storage. Weight doesn't matter at all since the battery won't be moved. The most important thing is lifetime. Traditional nickel iron batteries last for decades and can be refurbished.

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  • [–] 4 points 8 months ago*

    I looked around and found that lithium ion batteries will range from 100-270 Wh/kg and up to 10 kW/kg.

    So these particular batteries are sort of an improvement, less energy by weight but better power if I understand correctly. Definitely not an expert.

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