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

Article scientifique 2017 Anglais

Résumé

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 °C.

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Son, I., Park, J., Park, S., Park, K., Han, S., Shin, J., Doo, S., Hwang, Y., Chang, H., Choi, J. (2017). Graphene balls for lithium rechargeable batteries with fast charging and high volumetric energy densities. https://doi.org/10.1038/s41467-017-01823-7

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Auteur(s)

In Hyuk Son Jong Hwan Park Seongyong Park Kwangjin Park Sangil Han Jaeho Shin Seok‐Gwang Doo Yunil Hwang Hyuk Chang Jang Wook Choi

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