신소재공학과

Research Highlight

from left: Dr. Bok Yeop Ahn, Dr. Chanhoon Kim, Professor Il-Doo Kim and Professor Jennifer A. Lewis
(from left: Dr. Bok Yeop Ahn, Dr. Chanhoon Kim, Professor Il-Doo Kim and Professor Jennifer A. Lewis)

 

Flexible, wireless electronic devices are rapidly emerging and have reached the level of commercialization; nevertheless, most of battery shapes are limited to either spherical and/or rectangular structures, which results in inefficient space use. Professor Il-Doo Kim’s team from the Department of Materials Science at KAIST has successfully developed technology to significantly enhance the variability of battery design through collaboration research with Professor Jennifer A. Lewis and her team from the School of Engineering and Applied Sciences at Harvard University.


Most of the battery shapes today are optimized for coin cell and/or pouch cells. Since the battery as an energy storage device occupies most of the space in microelectronic devices with different designs, new technology to freely change the shape of the battery is required. 

The KAIST-Harvard research collaboration team has successfully manufactured various kinds of battery shapes, such as ring-type, H, and U shape, using 3D printing technology. And through the research collaboration with Dr. Youngmin Choi at the Korea Research Institute of Chemical Technology (KRICT), 3D-printed batteries were applied to small-scale wearable electronic devices (wearable light sensor rings). 

The research group has adopted environmentally friendly aqueous Zn-ion batteries to make customized battery packs. This system, which uses Zn2+ instead of Li+ as charge carriers, is much safer compared with the conventional lithium rechargeable batteries that use highly inflammable organic electrolytes. Moreover, the processing conditions of lithium-ion batteries are very complicated because organic solvents can ignite upon exposure to moisture and oxygen.

As the aqueous Zn-ion batteries adopted by the research team are stable upon contact with atmospheric moisture and oxygen, they can be fabricated in the ambient air condition, and have advantages in packaging since packaged plastic does not dissolve in water even when plastic packaging is applied using a 3D printer. 

To fabricate a stable cathode that can be modulated in various forms and allows high charge-discharge, the research team fabricated a carbon fiber current collector using electrospinning process and uniformly coated electrochemically active polyaniline conductive polymer on the surface of carbon fiber for a current collector-active layer integrated cathode. The cathode, based on conductive polyaniline consisting of a 3D structure, exhibits very fast charging speeds (50% of the charge in two minutes) and can be fabricated without the detachment of active cathode materials, so various battery forms with high mechanical stability can be manufactured. 

Prof. Kim said, “Zn-ion batteries employing aqueous electrolytes have the advantage of fabrication under ambient conditions, so it is easy to fabricate the customized battery packs using 3D printing.” 

“3D-printed batteries can be easily applied for niche applications such as wearable, personalized, miniaturized micro-robots, and implantable medical devices or microelectronic storage devices with unique designs,” added Professor Lewis.

With Dr. Chanhoon Kim in the Department of Materials Science and Engineering at KAIST and Dr. Bok Yeop Ahn School of Engineering and Applied Sciences at Harvard University participating as equally contributing first authors, this work was published in the December issue of ACS Nano.

This work was financially supported by the Global Research Laboratory (NRF-2015K1A1A2029679) and Wearable Platform Materials Technology Center (2016R1A5A1009926).

Figure 1.Fabrication of shape-conformable batteries based on 3D-printing technology and the application of polyaniline carbon nanofiber cathodes and wearable electronic devices
Figure 1.Fabrication of shape-conformable batteries based on 3D-printing technology and the application of polyaniline carbon nanofiber cathodes and wearable electronic devices   

Figure 2.Fabricated shape-conformable batteries based on a 3D-printing method
Figure 2.Fabricated shape-conformable batteries based on a 3D-printing method 


Meanwhile, Professor Il-Doo Kim was recently appointed as an Associate Editor of ACS Nano, a highly renowned journal in the field of nanoscience. 

Professor Kim said, “It is my great honor to be an Associate Editor of the highly renowned journal ACS Nano, which has an impact factor reaching 13.709 with 134,596 citations as of 2017. Through the editorial activities in the fields of energy, I will dedicate myself to improving the prominence of KAIST and expanding the scope of Korea’s science and technology. I will also contribute to carrying out more international collaborations with world-leading research groups.” 

Associate Editor of ACS Nano Professor Il-Doo Kim
(Associate Editor of ACS Nano Professor Il-Doo Kim)
No. Subject Author Date Views
Notice Real-Time Analysis of MOF Adsorption Behavior ADMINI 2019.06.21 37
Notice Unravelling Inherent Electrocatalysis to Improve the Performance of Hydrogen Fuel Cells ADMINI 2019.03.28 267
Notice KAIST Top 10 Research Achievements of 2018 - Prof. Byong-Guk Park ADMINI 2019.02.01 739
Notice Stretchable Multi-functional Fiber for Energy Harvesting and Strain Sensing ADMINI 2019.02.01 757
» Fabrication of Shape-conformable Batteries Based on 3D-printing Technology ADMINI 2019.01.04 928
Notice New Anisotropic Conductive Film for Ultra-Fine Pitch Assembly Applications ADMINI 2018.11.30 877
Notice KAIST Introduces Faster and More Powerful Aqueous Hybrid Capacitor ADMINI 2018.11.13 817
56 “Nature Materials” News & Views wrote by Prof. Sang Ouk Kim file admin 2015.02.17 11754
55 Hyper-stretchable elastic piezoelectric energy harvester file ADMINI 2015.04.29 9807
54 The Way towards Commercialization of Highly Efficient Nanogenerator file admin 2015.02.17 9260
53 Academic Achievements & Related Awards file admin 2015.02.17 9256
52 Best Paper Award at 2014 Pan Pacific Microelectronic Symposium file admin 2015.02.17 9076
51 The First Demonstration of Self-powered Cardiac Pacemaker file admin 2015.02.17 9025
50 Equipment Development: “Hu:u” -New Concept Indoor Environmental Gauge file admin 2015.02.17 5725
49 Making Graphene Using Laser-induced Phase Separation file ADMINI 2016.12.07 4598
48 One of 2013 KAIST Top 10 Representative R&D Outcomes. file admin 2015.02.17 4516
47 Mobile Sensor Array Platform & its Circuit Development. file admin 2015.02.17 4101
46 Intel Best Paper Award at Electronic Components and Technology Conference file admin 2015.02.17 4082
45 Excellent Paper Award at the 2014 Conference on Next Generation Lithography file admin 2015.02.17 4072
44 Seon-Jin Choi, Jinsup Lee Prize Winner at the “9th 1nside” Edge International Thesis Competition from Samsung Electro-mechanics. file admin 2015.02.17 4028
43 Grand Prize at the Dow Chemical Korea Award 2014 file admin 2015.02.17 3986
42 3D Free Standing Structure Made of Graphene. file admin 2015.02.17 3968
41 The Convergence New Technology Fair Silver Award file admin 2015.02.17 3955
40 Prize Winner at 20th SAMSUNG Human Tech Paper award (2013) file admin 2015.02.17 3880
39 Review article from Prof. Sang Ouk, Kim group was published in 25th anniversary of Advanced Materials. file admin 2015.02.17 3833
38 Excellent paper Award at the Optical Society of Korea. file admin 2015.02.17 3672
37 New Nanocomposite Catalyst applied for Li-O2 Batteries with improved High-capacity and Long-cycle file admin 2015.02.17 3656