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A Combined Li Intercalation and Plating Mechanism Using Conductive Carbon Fiber Electrodes

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Zhao, Tommy Zijian 
Dose, Wesley 


Lithium metal anodes (LMAs) are desirable for next-generation rechargeable batteries because of their high energy density. However, in practical applications they are hindered by inhomogeneous and uncontrolled Li dendrite deposition during cycling. Herein, we propose a dual charge storage mechanism, using freestanding carbon fiber paper (CFP) with carbon fillers electrode. These CFP electrodes are manufactured at an industrial scale and act both as a host for Li intercalation and as a conductive, porous, and lithiophilic 3D scaffold for Li plating/stripping. The CFP electrode exhibits excellent long-term cycling stability, as evidenced by Coulombic Efficiencies of over 99.5% on the 250th cycle in CFP|Li half-cells with a lithiation capacity of 1.5 mA h cm-2 and current density of 0.5 mA cm-2. We also demonstrate that the CFPs are sufficiently electrically conductive to operate in small pouch cells without metal foil current collectors, further improving the energy density of the proposed electrodes.



lithium metal anode, 3D structured electrode, carbon fiber paper, current collector, high capacity

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Batteries & Supercaps

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Engineering and Physical Sciences Research Council (EP/L016567/1)
European Commission Horizon 2020 (H2020) ERC (866005)