Bending-Tolerant Anodes for Lithium-Metal Batteries
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Bendy batteries could be made more durable by protecting vulnerable components in a flexible carbon frame.
batteries can hold a lot of power, but lithium crystals can grow inside the
cell with detrimental effects. Bending the battery leads to more crystal growth
and increases the likelihood of a short circuit.
team including researchers from the Collaborative Innovation Center of Chemical
Science and Engineering in Tianjin built an anode by combining lithium with
graphene, a single layer of carbon atoms. The graphene provided a flexible
frame that absorbed the stresses caused by bending and prevented the growth of
lithium crystals. The team tested their anode in a battery and found that it
lasted 1000 hours, whereas a cell made using a purely lithium anode short-circuited
after just 200 hours.
Durable, bendy batteries could be used in wearable electronics and flexible solar cells that can withstand damage.
- Advanced Materials 30, 1703891 (2017). doi: 10.1002/adma.201703891