Though not as small as the ITEN 100 µAh micro battery, this innovative lithium-ion battery developed by researchers at the Korea Institute of Science and Technology (KIST) can be printed on stretch fabric. What made it possible was an organic gel that could be applied it to an existing binder instead of adding a material, like rubber, thus facilitating ion transfer as well as electrode active material fixing.
This battery is also capable of integrating existing lithium-ion battery materials, as they exhibit ideal energy storage density (~2.8 mWh/cm2) of a level similar to that of commercially available hard lithium-ion batteries at a driving voltage of 3.3 V or higher. When every component of the stretchable lithium-ion battery is combined, they possess the mechanical stability to maintain their performance even after repeated pulling of the battery 1,000 or more times. Future applications include building these batteries directly into clothing to power wearable electronics.
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Due to structural and materials freedoms, we successfully fabricate several types of stretchable lithium-ion battery that reliably operates under various stretch deformations with capacity and rate capability comparable with a non-stretchable battery over 2.5 mWh cm–2 at 0.5 C, even under high mass loading conditions over 10 mg cm–2, including stacked configuration, direct integration on both sides of a stretch fabric, and application of various electrode materials and electrolytes,” said the researchers.
