dc.contributor.advisor |
Park, Soojin |
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dc.contributor.author |
Kim, Chanhoon |
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dc.date.accessioned |
2024-01-24T14:36:06Z |
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dc.date.available |
2024-01-24T14:36:06Z |
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dc.date.issued |
2014-08 |
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dc.description.abstract |
In this study, environmentally friendly aqueous binder for high capacity anode materials and high performance silicon/hard carbon anode materials are successfully synthesized using natural polysaccharides. Aqueous binder using natural polysaccharides has excellent binding property as well as makes stable solid-electrolyte-interface layer on silicon particles so that the electrodes containing the aqueous binder can maintain stable cycle retention. Si-based anodes with this aqueous binder exhibit significantly improved electrochemical properties which show a high specific capacity (2010 mAh g-1) after 80 cycles. High performance silicon/hard carbon anode materials derived from natural polysaccharide show remarkable discharge/charge capability at a high current density. Nanocrystalline Si (c-Si) dispersed in amorphous Si (a-Si) encapsulating hard carbon (HC) has been synthesized as an anode material for fast chargeable lithium-ion batteries. The HC derived from natural polysaccharide was coated by thin a-Si layer through chemical vapor deposition (CVD) using silane (SiH4) as a precursor gas. The HC@c-Si@a-Si anodes showed excellent cycle retention of 97.8 % even after 200 cycles at a 1 C discharge/charge rate. Furthermore, high capacity retention of ~54 % of its initial reversible capacity at 0.2 C rate was obtained at a high discharge/charge rate of 5 C. Moreover, LiCoO2/HC@c-Si@a-Si full-cell showed excellent rate capability and very stable long-term cycle. Even at a rate of 10 C discharge/charge, the capacity retention of the LiCoO2/HC@c-Si@a-Si full-cell was 50.8% of its capacity at a rate of 1 C discharge/charge and showed superior cycle retention of 80 % after 160 cycles at a rate of 1 C discharge/charge. |
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dc.description.degree |
Master |
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dc.description |
Department of Energy Engineering |
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dc.identifier.uri |
https://scholarworks.unist.ac.kr/handle/201301/71821 |
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dc.identifier.uri |
http://unist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001754689 |
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dc.language |
ENG |
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dc.publisher |
Ulsan National Institute of Science and Technology |
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dc.rights.embargoReleaseDate |
9999-12-31 |
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dc.rights.embargoReleaseTerms |
9999-12-31 |
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dc.title |
Multi-functionalities of Natural Polysaccharide for the Next Generation Lithium-Ion Batteries |
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dc.type |
Thesis |
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