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Li-ion rechargeable batteries have enabled the wireless revolutiontransforming global communication. Future challenges, however, demandsdistributed energy supply at a level that is not feasible with the currentenergy-storage technology. New materials, capable of providing higher energydensity are needed. Here we report a new class of lithium-ion batteries basedon a graphene ink anode and a lithium iron phosphate cathode. By carefullybalancing the cell composition and suppressing the initial irreversiblecapacity of the anode, we demonstrate an optimal battery performance in termsof specific capacity, i.e. 165 mAhg-1, estimated energy density of about 190Whkg-1 and life, with a stable operation for over 80 charge-discharge cycles.We link these unique properties to the graphene nanoflake anode displayingcrystalline order and high uptake of lithium at the edges, as well as to itsstructural and morphological optimization in relation to the overall batterycomposition. Our approach, compatible with any printing technologies, is cheapand scalable and opens up new opportunities for the development ofhigh-capacity Li-ion batteries.

A lithium-ion battery based on a graphene nanoflakes ink anode and a lithium iron phosphate cathode