A half millimeter thick coplanar flexible battery with wireless recharging capability

Nano Letters
Joo-Seong KimJang Wook Choi

Abstract

Most of the existing flexible lithium ion batteries (LIBs) adopt the conventional cofacial cell configuration where anode, separator, and cathode are sequentially stacked and so have difficulty in the integration with emerging thin LIB applications, such as smart cards and medical patches. In order to overcome this shortcoming, herein, we report a coplanar cell structure in which anodes and cathodes are interdigitatedly positioned on the same plane. The coplanar electrode design brings advantages of enhanced bending tolerance and capability of increasing the cell voltage by in series-connection of multiple single-cells in addition to its suitability for the thickness reduction. On the basis of these structural benefits, we develop a coplanar flexible LIB that delivers 7.4 V with an entire cell thickness below 0.5 mm while preserving stable electrochemical performance throughout 5000 (un)bending cycles (bending radius = 5 mm). Also, even the pouch case serves as barriers between anodes and cathodes to prevent Li dendrite growth and short-circuit formation while saving the thickness. Furthermore, for convenient practical use wireless charging via inductive electromagnetic energy transfer and solar cell integration is demonstrated.

References

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Citations

Oct 24, 2015·ACS Nano·Yong-Hee LeeJang Wook Choi
Sep 29, 2015·ACS Nano·Lu LiNikhil Koratkar
May 18, 2016·Scientific Reports·Aminy E OstfeldAna C Arias
Sep 9, 2016·ACS Nano·Gui-Wen HuangShao-Yun Fu
Feb 6, 2017·ACS Applied Materials & Interfaces·Abhinav M Gaikwad, Ana Claudia Arias
May 16, 2017·Angewandte Chemie·Jingwen ZhaoLiquan Chen
Jan 20, 2017·Advanced Materials·Minjoon ParkJaephil Cho
May 12, 2018·Advanced Materials·Se-Woong BaekJung-Yong Lee
Dec 9, 2015·Advanced Materials·Ye ZhangHuisheng Peng
Dec 2, 2017·Advanced Materials·Lie WangHuisheng Peng

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