Flexi-battery stretches 300%

An international research team has made a stretchable battery by forming an array of 2mm diameter Li-ion cells in a layer of silicone elastomer.

Individual cells are connected into a battery using 50µm copper tracks deposited in a serpentined serpentine pattern to allow flexibility without breakage.

Capacity is around 1.1mAh/cm2, and a stretchable coil has been incorporated to allow the battery to be charged wirelessly.

Poor cycle life and self-discharge remain issues.

Contributing institutions are: University of Illinois at Urbana-Champaign, Tsinghua University (Beijing) , Northwestern University (Illinois) and Hanyang University (Seoul).

The work is covered in Nature Communications.

Tags: Battery, flexible, Li-ion, stretch

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