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Creating a safer phone battery that won't catch fire

Mr Zimmerman shows how he can repeatedly poke a screwdriver through a solid polymer lithium metal battery without causing a fire or other hazardous event.

San Francisco

MIKE Zimmerman likes to shock his guests by using a hammer to drive a nail through a solid polymer lithium metal battery.

Nothing happens - and that's a good thing.

Mr Zimmerman's battery is a new spin on lithium-ion batteries, which are widely used in products...

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