Continuous carbon nanotube composite fibers for flexible aqueous lithium-ion batteries

Abstract Continuous composite fibers have been obtained by online modifying the direct-spun carbon nanotube (CNT) fibers with active materials (LiFePO4 or LiTi2PO4) through dipping and twisting. The composite fibers exhibit high specific capacity and good rate performance for an aqueous lithium-ion battery with 1 M Li2SO4 electrolyte, due to the fast electron transport arising from the close contact between the active materials and CNTs. A flexible fiber-shaped aqueous lithium-ion battery fabricated from the composites can deliver a high specific capacity of 29.1 mAh g−1 at a current density of 0.25 A g−1 and a high energy density of 30.12 Wh kg−1, showing the great potential of the composite fibers for applications in flexible energy storage devices.

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