Highly Stable Germanium Microparticle Anodes with a Hybrid Conductive Shell for High Volumetric and Fast Lithium Storage
SCIE
SCOPUS
- Title
- Highly Stable Germanium Microparticle Anodes with a Hybrid Conductive Shell for High Volumetric and Fast Lithium Storage
- Authors
- Song, Gyujin; Lee, June Ho; Lee, Sangyeop; Han, Dong-Yeob; Choi, Sungho; Kwak, Myung-Jun; Jang, Ji-Hyun; Lee, Donghwa; Park, Soojin
- Date Issued
- 2022-01-12
- Publisher
- American Chemical Society
- Abstract
- The ability to realize a highly capacitive/conductive electrode is an essential factor in large-scale devices, requiring a high-power/energy density system. Germanium is a feasible candidate as an anode material of lithium-ion batteries to meet the demands. However, the application is constrained due to low charge conductivity and large volume change on cycles. Here, we design a hybrid conductive shell of multi-component titanium oxide on a germanium microstructure. The shell enables facile hybrid ionic/electronic conductivity for swift charge mobility in the germanium anode, revealed through computational calculation and consecutive measurement of electrochemical impedance spectroscopy. Furthermore, a well-constructed electrode features a high initial Coulombic efficiency (90.6%) and stable cycle life for 800 cycles (capacity retention of 90.4% for a fast-charging system. The stress-resilient properties of dense microparticle facilitate to alleviate structural failure toward high volumetric (up to 1737 W h L-1) and power density (767 W h L-1 at 7280 W L-1) of full cells, paired with highly loaded NCM811 in practical application.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/109521
- DOI
- 10.1021/acsami.1c18607
- ISSN
- 1944-8244
- Article Type
- Article
- Citation
- ACS Applied Materials and Interfaces, vol. 14, no. 1, page. 750 - 760, 2022-01-12
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