Synthesis and optimization of nanoparticle Ge confined in a carbon matrix for lithium battery anode material
- Authors
- Lee, Hyojin; Kim, Hansu; Doo, Seok-Gwang; Cho, Jaephil
- Issue Date
- 2007
- Publisher
- ELECTROCHEMICAL SOC INC
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.154, no.4, pp A343 - A346
- Journal Title
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- Volume
- 154
- Number
- 4
- Start Page
- A343
- End Page
- A346
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/27197
- DOI
- 10.1149/1.2437059
- ISSN
- 0013-4651
1945-7111
- Abstract
- Ge nanoparticles with different particle sizes confined in a carbon matrix were prepared by annealing Ge nanoparticles terminated with butyl groups at 400, 600, and 800 degrees C. X-ray diffraction and transmission electron microscopy results showed that the Ge nanoparticles' size increased from 8 to 100 nm as the annealing temperature of the as-prepared samples increased from 400 to 800 degrees C. Raman spectra confirmed that the parts of the Ge nanoparticles were not covered by the carbon starting at 600 degrees C after annealing for 9 h. Moreover, the graphitization degree of the carbon increases with increasing temperature, and the sample, annealed at 800 degrees C for 3 h, showed the graphitization degree. Electrochemical cycling results revealed that the 10 nm Ge nanoparticles, confined in a carbon matrix obtained after annealing the as-prepared sample at 600 degrees C for 3 h, showed the best charge capacity of 1067 mAh/g with 12% capacity loss after 30 cycles. On the other hand, Ge nanoparticles that had not been covered with the carbon matrix showed a rapid capacity decrease, along with pulverization of Ge nanoparticles to a size of about 5-10 nm after cycling.
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