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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Calendering-Compatible Macroporous Architecture for Silicon-Graphite Composite toward High-Energy Lithium-Ion Batteries

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Title
Calendering-Compatible Macroporous Architecture for Silicon-Graphite Composite toward High-Energy Lithium-Ion Batteries
Author
Son, YeongukKim, NamhyungLee, TaeyongLee, YoonkwangMa, JiyoungChae, SujongSung, JaekyungCha, HyungyeonYoo, YoungshinCho, Jaephil
Issue Date
2020-08
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, pp.2003286
Abstract
Porous strategies based on nanoengineering successfully mitigate several problems related to volume expansion of alloying anodes. However, practical application of porous alloying anodes is challenging because of limitations such as calendering incompatibility, low mass loading, and excessive usage of nonactive materials, all of which cause a lower volumetric energy density in comparison with conventional graphite anodes. In particular, during calendering, porous structures in alloying-based composites easily collapse under high pressure, attenuating the porous characteristics. Herein, this work proposes a calendering-compatible macroporous architecture for a Si-graphite anode to maximize the volumetric energy density. The anode is composed of an elastic outermost carbon covering, a nonfilling porous structure, and a graphite core. Owing to the lubricative properties of the elastic carbon covering, the macroporous structure coated by the brittle Si nanolayer can withstand high pressure and maintain its porous architecture during electrode calendering. Scalable methods using mechanical agitation and chemical vapor deposition are adopted. The as-prepared composite exhibits excellent electrochemical stability of>3.6 mAh cm(-2), with mitigated electrode expansion. Furthermore, full-cell evaluation shows that the composite achieves higher energy density (932 Wh L-1) and higher specific energy (333 Wh kg(-1)) with stable cycling than has been reported in previous studies.
URI
https://scholarworks.unist.ac.kr/handle/201301/47851
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202003286
DOI
10.1002/adma.202003286
ISSN
0935-9648
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