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Interesting commentary on niobium from a segment on batteries by...

  1. Fredbear2
    69 Posts.
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    07/12/23
    12:13
    Post #: 71324065
    Interesting commentary on niobium from a segment on batteries by the Nickel Institute. Key sections extracted below. Ultimately, good for niobium demand in the long term, although not too sure how long it will take to commercialise - probably as long as it takes to get this into mining.

    https://nickelinstitute.org/en/blog/2023/december/battery-chat-with-parri-5-dr-stanley-whittingham/

    PA: You are currently working on the impact of Nb coating/substitution in Ni-rich cathode materials. How does the modification with Nb affect the overall battery performance?

    SW: We know that 60% nickel is stable in the air and works well. However, once the nickel content reaches 80%, stability in the air becomes compromised. This means we have to control the atmosphere more as the reactivity with the battery electrolyte increases so we lose capacity fairly fast. We started stabilizing the 80% nickel by adding valence elements. We found niobium works best. We got several hundred cycles out of 90% Ni (NMC 9055) with about 1% Nb. You do not need more than that. It looks like Nb stops the cracking of those cathode particles , and there is no capacity loss over several hundred cycles. The results are published in our 2022 open access paper:

    PA: What are the next steps for this research?

    SW: The next step is to study behavior at different temperatures and see if we can get to 800-1000 cycles, meaning build bigger cells for EVs. The theoretical energy density possible for high-nickel cathodes should be 1000 Wh/kg. In reality the cell is at 250 Wh/kg, so we are only getting 25%. The goal is to get up to 500 Wh/kg to double the energy density. We are also doing some research funded by the U.S. army to see how well the Nb-coated NMC behaves at higher and lower temperatures.

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    lightbulb Created with Sketch.  Great analysis
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