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This fully functional Li-ion battery is flexible

By Paul Grad |

A team from the Korea Advanced Institute of Science and Technology (Kaist; Daejeon, South Korea: www.kaist.ac.kr) and Seoul National University (www.useoul.edu) led by Kaist’s professor Keon Jae Lee, claims to have developed the first prototype of a fully functional all-flexible lithium ion battery (LIB). The LIB is based on all-solid-state materials with an energy density of 2.2 x 103 µWh/cm3 at a current flux rate of 46.5 µA/cm2 under polymer sheet wrapping. The Korean scientists claim this is the highest energy density ever achieved for flexible batteries. The construction of the bendable thin-film battery starts with a standard fabrication process upon a brittle mica substrate (diagram). A cathode current collector, a lithium cobalt oxide cathode (LiCoO2), high-temperature annealing of LiCoO2 at 700ºC), a lithium metal anode, and protective encapsulation multilayers are sequentially deposited on the substrate (Step 1). KAIST The next step is physical delamination of the mica substrate using sticky tapes (Step 2). The flexible LIB from substrate delamination is then transferred onto a PDMS (polydimethylsiloxane) polymer sheet (Step 3), where the surface bondability of the PDMS helps the stable settlement…
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