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08.03.2017, 11:47 - nieeshoes - Rank 6 - 1073 Posts
recipes for a rechargeable electrochemical soup,
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, though,
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, battery researchers must beware of side reactions that can spoil everything.
“There’s the chemical reaction you want — the one that stores energy and releases it,
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,” Crabtree says. “But there are dozens of other … reactions that also take place.” Those side reactions can disable a battery, or worse,
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, lead to a risk of catastrophic discharge. (Consider the recent fires in Samsung’s Galaxy Note 7 smartphones.)
Early versions of the lithium-ion battery from the 1970s carried an anode made of pure lithium metal. Through repeated use,
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, lithium ions were stripped off and replated onto the anode, creating fingerlike extensions that reached across to the cathode,
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, shorting out the battery. Today’s lithium-ion batteries have an anode made of graphite (a form of carbon) so that loose lithium ions can snuggle in between sheets of carbon atoms.
Lithium-ion batteries were originally developed with small electronics in mind; they weren’t designed for storing electricity on the grid or powering electric vehicles. Electric cars need lots of power, a quick burst of energy to move from stop to start. Electric car manufacturers now bundle thousands of such batteries together to provide power for up to 200 miles before recharging,
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, but that range still falls far short of what a tank of gas can offer. And lithium-ion batteries drain too quickly to feed long hours of demand on the grid.
Simply popping more batteries into a car or the grid isn’t the answer,
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, Crabtree says. Stockpiling doesn’t improve the charging

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