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Sand-Based Anode Triples Lithium-Ion Battery Performance 60

Posted by timothy
from the but-where-will-it-comes-from? dept.
Zothecula (1870348) writes "Conventional lithium-ion batteries rely on anodes made of graphite, but it is widely believed that the performance of this material has reached its zenith, prompting researchers to look at possible replacements. Much of the focus has been on nanoscale silicon, but it remains difficult to produce in large quantities and usually degrades quickly. Researchers at the University of California, Riverside have overcome these problems by developing a lithium-ion battery anode using sand."
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Sand-Based Anode Triples Lithium-Ion Battery Performance

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  • Re:That said... (Score:4, Interesting)

    by swillden (191260) <shawn-ds@willden.org> on Saturday July 12, 2014 @11:23AM (#47437985) Homepage Journal

    Some EVs also let you limit the max that your pack charges up to to further extend lifespan (it's usually destructive both to use the very top end and the bottom end of the discharge range).

    That is the theory, but real-world experience with the world's most successful EV (Nissan LEAF) isn't bearing it out. There doesn't appear to be any significant benefit to limiting charging to the 80% level. What is proving to matter, a lot, is temperature. The risks of very cold temperatures are so extreme that the cars have built-in battery heaters (powered by the batteries, obviously) to protect against them, so in practice cold just reduces range, but hot temperatures seriously impact battery longevity.

    Another theoretically-predicted battery-killer that is not showing real-world degradation is quick charging. I believe Nissan has even stopped telling people they should limit the amount of level 3 charging they do.

    Excellent points about larger capacity batteries needing to survive fewer cycles, though.

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