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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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Fabrication of Lamellar Nanosphere Structure for Effective Stress-Management in Large-Volume-Variation Anodes of High-Energy Li-ion Batteries

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Title
Fabrication of Lamellar Nanosphere Structure for Effective Stress-Management in Large-Volume-Variation Anodes of High-Energy Li-ion Batteries
Author
Sung, JaekyungMa, JiyoungChoi, Seong-HyeonHong, JaehyungKim, NamhyungChae, SujongSon, YeongukKim, Sung YoubCho, Jaephil
Issue Date
2019-08
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.31, no.33, pp.1900970
Abstract
The use of high-capacity anode materials to overcome the energy density limits imposed by the utilization of low-theoretical-capacity conventional graphite has recently drawn increased attention. Until now, stress management (including strategies relying on size, surface coating, and free volume control) has been achieved by addressing the critical problems originating from significant anode volume expansion upon lithiation. However, commercially viable alternatives to graphite have not yet been found. A new stress-management strategy relying on the use of a lamellar nanosphere Si anode is proposed. Specifically, nanospheres comprising approximate to 50 nm Si nanoparticles encapsulated by SiOx/Si/SiOx/C layers with thicknesses of (x) is found to act as a stress management interlayer when it is located between Si and mitigates stress intensification on the surface layer, allowing nanospheres to maintain their morphological integrity and promoting the formation of a stable solid electrolyte interphase layer during cycling. When tested using an industrial protocol, a full cell comprising a nanosphere/graphite blended anode and a lithium cobalt oxide cathode achieve an average energy density of 2440.2 Wh L-1 (1.72 times higher than that of conventional graphite) with a capacity retention ratio of 80% after 101 cycles.
URI
https://scholarworks.unist.ac.kr/handle/201301/26706
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201900970
DOI
10.1002/adma.201900970
ISSN
0935-9648
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MNE_Journal Papers
ECHE_Journal Papers
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