Amorphous GeOx-Coated Reduced Graphene Oxide Balls with Sandwich Structure for Long-Life Lithium-Ion Batteries
- Authors
- Choi, Seung Ho; Jung, Kyeong Youl; Kang, Yun Chan
- Issue Date
- 1-7월-2015
- Publisher
- AMER CHEMICAL SOC
- Keywords
- germanium oxide; graphene composite; anode material; lithium-ion battery; spray pyrolysis
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.7, no.25, pp.13952 - 13959
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 7
- Number
- 25
- Start Page
- 13952
- End Page
- 13959
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/93050
- DOI
- 10.1021/acsami.5b02846
- ISSN
- 1944-8244
- Abstract
- Amorphous GeOx-coated reduced graphene oxide (rGO) balls with sandwich structure are prepared via a spray-pyrolysis process using polystyrene (PS) nanobeads as sacrificial templates. This sandwich structure is formed by uniformly coating the exterior and interior of few-layer rGO with amorphous GeOx layers. X-ray photoelectron spectroscopy analysis reveals a Ge:O stoichiometry ratio of 1:1.7. The amorphous GeOx-coated rGO balls with sandwich structure have low charge-transfer resistance and fast Li+-ion diffusion rate. For example, at a current density of 2 A g(-1), the GeOx-coated rGO balls with sandwich and filled structures and the commercial GeO2 powders exhibit initial charge capacities of 795, 651, and 634 mA h g(-1), respectively; the corresponding 700th-cycle charge capacities are 758, 579, and 361 mA h g(-1). In addition, at a current density of 5 A g(-1), the rGO balls with sandwich structure have a 1600th-cycle reversible charge capacity of 629 mA h g(-1) and a corresponding capacity retention of 90.7%, as measured from the maximum reversible capacity at the 100th cycle.
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