Germanium microflower-on-nanostem as a high-performance lithium ion battery electrode

Gwang Hee Lee, S. Joon Kwon, Kyung Soo Park, Jin Gu Kang, Jae Gwan Park, Sungjun Lee, Jae Chan Kim, Hyun Woo Shim, Dong-Wan Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We demonstrate a new design of Ge-based electrodes comprising three-dimensional (3-D) spherical microflowers containing crystalline nanorod networks on sturdy 1-D nanostems directly grown on a metallic current collector by facile thermal evaporation. The Ge nanorod networks were observed to self-replicate their tetrahedron structures and form a diamond cubic lattice-like inner network. After etching and subsequent carbon coating, the treated Ge nanostructures provide good electrical conductivity and are resistant to gradual deterioration, resulting in superior electrochemical performance as anode materials for LIBs, with a charge capacity retention of 96% after 100 cycles and a high specific capacity of 1360 mA h g<sup>21</sup> at 1 C and a high-rate capability with reversible capacities of 1080 and 850 mA h g<sup>21</sup> at the rates of 5 and 10 C, respectively. The improved electrochemical performance can be attributed to the fast electron transport and good strain accommodation of the carbon-filled Ge microflower-on-nanostem hybrid electrode.

Original languageEnglish
Article number6883
JournalScientific Reports
Volume4
DOIs
Publication statusPublished - 2014 Nov 3

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Germanium
Nanorods
Carbon
Electrodes
Diamond
Thermal evaporation
Deterioration
Etching
Nanostructures
Anodes
Crystalline materials
Coatings
Lithium-ion batteries
Electron Transport
Electric Conductivity

ASJC Scopus subject areas

  • General

Cite this

Germanium microflower-on-nanostem as a high-performance lithium ion battery electrode. / Lee, Gwang Hee; Kwon, S. Joon; Park, Kyung Soo; Kang, Jin Gu; Park, Jae Gwan; Lee, Sungjun; Kim, Jae Chan; Shim, Hyun Woo; Kim, Dong-Wan.

In: Scientific Reports, Vol. 4, 6883, 03.11.2014.

Research output: Contribution to journalArticle

Lee, GH, Kwon, SJ, Park, KS, Kang, JG, Park, JG, Lee, S, Kim, JC, Shim, HW & Kim, D-W 2014, 'Germanium microflower-on-nanostem as a high-performance lithium ion battery electrode', Scientific Reports, vol. 4, 6883. https://doi.org/10.1038/srep06883
Lee, Gwang Hee ; Kwon, S. Joon ; Park, Kyung Soo ; Kang, Jin Gu ; Park, Jae Gwan ; Lee, Sungjun ; Kim, Jae Chan ; Shim, Hyun Woo ; Kim, Dong-Wan. / Germanium microflower-on-nanostem as a high-performance lithium ion battery electrode. In: Scientific Reports. 2014 ; Vol. 4.
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