3D graphene balls boost lithium battery fast charging
The new coating can be used on both the anode and cathode of a battery and boost the capacity by a quarter but also allowing a cell to charge in just 12 minutes rather than an hour for today’s batteries.
The hierarchical 3D structure with a SiOx nanoparticle at the centre allows the graphene-ball to be uniformly coated onto a nickel-rich layered cathode (LiNi0.6Co0.1Mn0.3O2) using chemical vapour deposition (CVD) and milling. This coating improves cycle life and fast charging capability by protecting the electrode surface from detrimental side reactions and providing efficient conductive pathways as well as boosting the energy storage.
The graphene-ball itself also serves as an anode material with high specific capacity of 716.2 mAh/g, boosting the capacity of a battery by 27%. This would allow a commercial battery cell to store 800 Wh/l and provide the fast charging with a high cyclability of over 78％ retention of the initial capacity after 500 cycles at 5ºC and 60ºC, opening up applications in electric vehicles.
Samsung has patented the technology but not said when it might be commercialised.
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