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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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Electrical Conductivity Gradient Based on Heterofibrous Scaffolds for Stable Lithium-Metal Batteries

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Title
Electrical Conductivity Gradient Based on Heterofibrous Scaffolds for Stable Lithium-Metal Batteries
Author
Hong, Sang-HoJung, Dae-HanKim, Jung-HwanLee, Yong-HyeokCho, Sung-JuJoo, Sang HoonLee, Hyun-WookLee, Ki-SukLee, Sang-Young
Issue Date
2020-04
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED FUNCTIONAL MATERIALS, v.30, no.14, pp.1908868
Abstract
The inability to guide the nucleation locations of electrochemically deposited Li has long been considered the main factor limiting the utilization of high-energy-density Li-metal batteries. In this study, an electrical conductivity gradient interfacial host comprising 1D high conductivity copper nanowires and nanocellulose insulating layers is used in stable Li-metal anodes. The conductivity gradient system guides the nucleation sites of Li-metal to be directed during electrochemical plating. Additionally, the controlled parameter of the intermediate layer affects the highly stable Li-metal plating. The electrochemical behavior is confirmed through experiments associated with the COMSOL Multiphysics simulation data. The distributed Li-ion reaction flux resulting from the controlled electrical conductivity enables stable cycling for more than 250 cycles at 1 mA cm(-2). The gradient system effectively suppresses dendrite growth even at a high current density of 5 mA cm(-2) and ensures Li plating and stripping with ultra-long-term stability. To demonstrate the high-energy-density full-cell application of the developed anode, it is paired with the LiNi0.8Co0.1Mn0.1O2 cathode. The cells demonstrate a high capacity retention of 90% with an extremely high Coulombic efficiency of 99.8% over 100 cycles. These results shed light on the formidable challenges involved in exploiting the engineering aspects of high-energy-density Li-metal batteries.
URI
https://scholarworks.unist.ac.kr/handle/201301/31522
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201908868
DOI
10.1002/adfm.201908868
ISSN
1616-301X
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