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Subject Graphene balls for lithium rechargeable batteries with fast charging and high volumetric energy densities
Journal Nature Communications
Date 2017-11-16
Abstract In the development of advanced lithium-ion batteries, improving one property without sacrificing others is challenging due to the trade-off nature among the key parameters. Here, we report a chemical vapor deposition process to grow a graphene-silica 3D assembly, called a graphene-ball. Its hierarchical 3D structure with the SiOx nanoparticle center allows even 1 wt% graphene-ball to be uniformly coated onto a nickel-rich layered cathode (LiNi0.6Co0.1Mn0.3O2) via mild Nobilta milling. The graphene-ball coating improves cycle life and fast charging capability by protecting the electrode surface from detrimental side reactions and providing efficient conductive pathways. The graphene-ball itself also serves as an anode material with 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% retention of the initial capacity after 500 cycles at 5C and 60 oC.
DOI http://dx.doi.org/DOI: 10.1038/s41467-017-01823-7
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