A Half Millimeter Thick Coplanar Flexible Battery with Wireless Recharging Capability

Joo Seong Kim, Dongah Ko, Dong Joo Yoo, Dae Soo Jung, Cafer T. Yavuz, Nam In Kim, In Suk Choi, Jae Yong Song, Jang Wook Choi

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

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. (Figure Presented).
Original languageEnglish (US)
Pages (from-to)2350-2357
Number of pages8
JournalNano Letters
Volume15
Issue number4
DOIs
StatePublished - Apr 8 2015
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Materials Science(all)
  • Chemistry(all)
  • Mechanical Engineering
  • Condensed Matter Physics

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