Fibrin biopolymer hydrogel-templated 3D interconnected Si@C framework for lithium ion battery anodes
- Authors
- Kim, Woong-Ju; Kang, Jin Gu; Kim, Dong-Wan
- Issue Date
- 15-Jun-2021
- Publisher
- ELSEVIER
- Keywords
- 3D Si@C network; Fibrin template; Hydrogen bonding; Lithium-ion batteries; N-doped C; Pyrolysis
- Citation
- APPLIED SURFACE SCIENCE, v.551
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 551
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/137299
- DOI
- 10.1016/j.apsusc.2021.149439
- ISSN
- 0169-4332
- Abstract
- Silicon is considered a promising candidate for lithium-ion battery anodes because of its exceptionally high capacity. However, employing Si in real applications remains a challenge, owing to dramatic reduction in the capacity after a few cycles. Redesigning the advanced electrode structure, including the available free volume and continuous conductive scaffold, may potentially circumvent this problem. Here, we demonstrate a new method of creating binder- and conductive additive-free three-dimensional (3D) porous network Si@C electrodes via fibrin hydrogel templating followed by pyrolysis. Hydrogen bonds between hydroxyl groups on Si and amides of fibrin enable the hierarchical 3D structures. These comprise well-distributed Si nanoparticles (SiNPs) in carbon frameworks, with each particle conformally encapsulated by the carbon layer. We confirm that carbon is doped with nitrogen and that pyridinic N and pyrrolic N are the predominant configurations. The 3D Si@C electrode exhibits a good rate performance (capacity of 730 mAh g(-1) at 1000 mA g(-1) (0.5C, Si + C basis)) and also a stable cycling property (54% capacity retention after 500 cycles at 500 mA g(-1)). Compared to a conventional mixture (SiNPs/alginate/Super P), the 3D Si@C electrode exhibits significantly improved electrochemical properties.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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