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Graphene balls for lithium rechargeable batteries with fast charging and high volumetric energy densities

Cited 86 time in Web of Science Cited 88 time in Scopus
Authors
Son, In Hyuk; Park, Jong Hwan; Park, Seongyong; Park, Kwangjin; Han, Sangil; Shin, Jaeho; Doo, Seok-Gwang; Hwang, Yunil; Chang, Hyuk; Choi, Jang Wook
Issue Date
2017-11
Citation
Nature Communications, Vol.8, p. 1561
Abstract
Improving one property without sacrificing others is challenging for lithium-ion batteries due to the trade-off nature among key parameters. Here we report a chemical vapor deposition process to grow a graphene-silica assembly, called a graphene ball. Its hierarchical three-dimensional structure with the silicon oxide nanoparticle center allows even 1 wt% graphene ball to be uniformly coated onto a nickel-rich layered cathode via scalable Nobilta milling. The graphene-ball coating improves cycle life and fast charging capability by suppressing detrimental side reactions and providing efficient conductive pathways. The graphene ball itself also serves as an anode material with a high specific capacity of 716.2 mAh g(-1). A full-cell incorporating graphene balls increases the volumetric energy density by 27.6% compared to a control cell without graphene balls, showing the possibility of achieving 800 Wh L-1 in a commercial cell setting, along with a high cyclability of 78.6% capacity retention after 500 cycles at 5C and 60 degrees C.
ISSN
2041-1723
URI
https://hdl.handle.net/10371/164671
DOI
https://doi.org/10.1038/s41467-017-01823-7
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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