Vertically aligned Si@reduced graphene oxide frameworks for binder-free high-areal-capacity Li-ion battery anodes
- Authors
- Park, Sung-Woo; Shin, Hyun Jung; Heo, Young Jin; Kim, Dong-Wan
- Issue Date
- 5월-2021
- Publisher
- WILEY
- Keywords
- binder-free anode; high areal capacity; lithium-ion battery; reduced graphene oxide; silicon
- Citation
- INTERNATIONAL JOURNAL OF ENERGY RESEARCH, v.45, no.6, pp.9704 - 9712
- Indexed
- SCIE
SCOPUS
- Journal Title
- INTERNATIONAL JOURNAL OF ENERGY RESEARCH
- Volume
- 45
- Number
- 6
- Start Page
- 9704
- End Page
- 9712
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/128104
- DOI
- 10.1002/er.6461
- ISSN
- 0363-907X
- Abstract
- In this study, lamellar-structured, vertically aligned silicon@reduced graphene oxide frameworks (VA-Si@rGO) are developed for binder-free, high-areal-capacity lithium ion battery (LiB) anodes. First, SiO2/rGO frameworks with unidirectional pores are constructed via the gelation of SiO2/graphene oxide sol and subsequent freeze-casting. Afterwards, the sturdy constructed frameworks are maintained during a series of processes, namely magnesiothermic reduction, acid etching, and thermal carbon coating, which result in carbon-coated VA-Si@rGO. The electrode exhibits a high specific capacity, reversibility, and cycle stability, which are attributed to its unique inner porous structure, high Si yield, and uniform carbon layers. A high areal capacity of approximately 9 mAh cm(-2) could be achieved by increasing the initial sol concentration up to 23.5 wt%. Furthermore, even at a high current density of 3 mA cm(-2), the electrode delivered a high areal capacity of approximately 6 mAh cm(-2) and exhibited excellent stability with a high capacity retention of 68% after the 150th cycle.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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