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Park, Soojin
Nano-Functional Materials Lab
Research Interests
  • Block Copolymers, nanostructured materials for Lithium-Ion batteries, wearable and stretchable energy storage applications

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Intramolecular deformation of zeotype-borogermanate toward a three-dimensional porous germanium anode for high-rate lithium storage

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Title
Intramolecular deformation of zeotype-borogermanate toward a three-dimensional porous germanium anode for high-rate lithium storage
Author
Yoon, TaeseungSong, GyujinHarzandi, Ahmad M.Ha, MiranChoi, SunghoShadman, SaharRyu, JaegeonBok, TaesooPark, SoojinKim, Kwang S.
Issue Date
201809
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.33, pp.15961 - 15967
Abstract
We demonstrate a new class of synthetic process for three-dimensional porous Ge materials (3D-pGe). Starting from zeotype-borogermanate microcubes, the 3D-pGe sample was synthesized through a thermal deformation of artificial Ge-rich zeolite, etching, and subsequent hydrogen reduction. After the synthesis, the resultant byproducts were simply removed by warm water instead of a harmful etchant such as hydrofluoric acid. Benefiting from the structural advantages with meso/macro porosity in the overall framework, the as-prepared 3D-pGe exhibits good electrochemical properties as anode materials for lithium-ion batteries with a high capacity (770 mA h g(-1)), cycling stability (capacity retention over 83%) after 250 cycles at 1C, and excellent rate capability (32% for 10C with respect to C/5) as well as pseudocapacitive contribution by surface-controlled reaction. This study paves the way to a new synthesis strategy of 3D porous Ge anode materials from zeolite for large-scale energy storage applications
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DOI
http://dx.doi.org/10.1039/c8ta04626c
ISSN
2050-7488
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